Pennsylvania Form LIBC-501 is the Notice of Compensation Payable, the document a Pennsylvania employer or its workers’ compensation insurer files with the Bureau of Workers’ Compensation to formally accept a work injury and start paying wage-loss or medical benefits. The form binds the insurer to the injury description, the average weekly wage, and the compensation rate listed on it, and those entries control how every future check, medical bill, and dispute is handled.
The form must be filed within 21 days of the employer’s notice of the injury under Section 406.1 of the Pennsylvania Workers’ Compensation Act. According to the Bureau’s annual report, Pennsylvania employers and carriers file roughly 170,000 first-report documents each year, and disputes over LIBC-501 entries — especially the average weekly wage box — drive a large share of the Bureau’s penalty petitions.
Here’s what this guide covers:
- 📋 What LIBC-501 is, who must file it, and how it differs from LIBC-495 and LIBC-496
- 🧮 How to calculate the Average Weekly Wage (AWW) and compensation rate the right way
- 🖊️ A line-by-line walkthrough of every field, box, and signature line on the form
- 👥 Three filled-out scenarios using named workers and real numbers
- ⚠️ The 10 most common LIBC-501 mistakes and the penalties they trigger
What LIBC-501 Is and Who Must File It
Form LIBC-501 is the Notice of Compensation Payable used by Pennsylvania employers and their insurance carriers to accept liability for a work injury under the Pennsylvania Workers’ Compensation Act. Filing this form tells the Bureau, the injured worker, and any treating provider that the claim is accepted and that benefits will begin. It is filed through the Workers’ Compensation Automation and Integration System (WCAIS) by Electronic Data Interchange (EDI) for most carriers, and by paper for self-insured employers without EDI access.
The form is not filed by the injured worker. It is filed by one of three parties: the workers’ compensation insurance carrier, a self-insured employer, or a third-party administrator (TPA) handling the claim. The injured worker receives a copy by mail and should review every entry carefully because each box becomes the legal baseline for the claim. If the worker spots a wrong wage, wrong injury description, or wrong start date on the form, those errors will follow the claim until they are corrected by petition or supplemental agreement.
LIBC-501 sits inside a family of acceptance and denial forms. The carrier picks the right form based on how confident it is in the claim and how much investigation time it needs. Choosing the wrong form is the single most common mistake adjusters make, and it usually costs the carrier money or rights down the line.
LIBC-501 vs. LIBC-495 vs. LIBC-496
| Form | Purpose |
|---|---|
| LIBC-501 — Notice of Compensation Payable | Full acceptance of the claim; binds the carrier to the injury description and wage |
| LIBC-495 — Notice of Temporary Compensation Payable | 90-day “test drive” acceptance; can be revoked with LIBC-502 and LIBC-761 |
| LIBC-496 — Notice of Compensation Denial | Full denial of the claim within the 21-day window |
| LIBC-501 (Medical-Only) | Same form, with the Medical Only box checked when no wage loss is paid |
The difference matters because filing LIBC-501 instead of LIBC-495 means the carrier has given up the 90-day revocation window granted by Section 406.1(d). Once LIBC-501 is filed, the only ways out of paying are a Termination, Suspension, or Modification Petition, a signed LIBC-756 (Notification of Suspension or Modification), or a Compromise and Release agreement.
Before You Start: Documents and Information You Need
Before opening the form, gather every piece of information that the Bureau will compare against the entries. Missing data is the leading cause of LIBC-501 rejections in WCAIS, and a rejected filing does not stop the 21-day clock from running under Section 406.1. Adjusters who file at hour 504 (the 21-day deadline) without complete data routinely face penalty petitions because the form bounces back and the corrected version is late.
Pull these items together first:
- Injured worker’s full legal name, Social Security number, date of birth, mailing address, and phone number, because the SSN drives the WCAIS claim record and a wrong digit creates a duplicate claim.
- Employer’s legal name, FEIN, NAICS code, and Bureau code, because the Bureau matches the FEIN to the insurance coverage record on file.
- Date of injury and date employer first had notice, because the 21-day clock runs from notice, not from the injury date itself.
- Detailed injury description with body parts and ICD-10 codes, because anything left off the description is later argued to be “not part of the accepted injury.”
- Average Weekly Wage worksheet using LIBC-494A or LIBC-494C, because Section 309 of the Act requires the AWW to be built from the four highest of the last four 13-week periods.
- Statewide Average Weekly Wage (SAWW) for the year of injury, posted by the Bureau, because the SAWW caps the maximum compensation rate.
- Concurrent employment wages, because Section 309(e) requires the carrier to add wages from a second employer when the worker held both jobs at the time of injury.
- First date of disability and the date the seven-day waiting period was satisfied, because the waiting-period days are not paid until the disability lasts 14 days.
- Insurance carrier name, NAIC number, claim number, and adjuster contact, because the Bureau uses the NAIC number to route every future filing.
- Treating provider information and any prior LIBC-495 already on file, because converting an LIBC-495 to an LIBC-501 changes which boxes you check.
Where to Get the Form and How to Access It
The official current-revision PDF lives on the Department of Labor & Industry website as Form LIBC-501. Always pull a fresh copy each time you file, because the Bureau republishes the form when statutory rates or field labels change, and a stale form will be rejected at the WCAIS gateway.
Most carriers do not file the PDF at all. They file LIBC-501 data through EDI Release 3.1 into WCAIS, which translates the EDI feed into the equivalent of a completed LIBC-501. The PDF is still useful for self-insured employers, attorneys, and injured workers who want to see exactly what the carrier reported. The PDF and the EDI record must contain identical data — when they do not, the Bureau treats the EDI record as controlling.
Anyone can register for a free WCAIS account at the WCAIS login page, but only the carrier-of-record or its authorized TPA can file a Bureau document under a claim. Injured workers can register as a “Claimant” user and view every LIBC form filed under their claim number, including LIBC-501. That visibility is one reason injured workers should always register — it lets them spot a wrong AWW or wrong injury description in real time, before benefits start at the wrong rate.
Step-by-Step: How to Fill Out LIBC-501 Line by Line
The form is one page with roughly two dozen fields grouped into employee data, employer data, injury data, wage data, compensation data, and signature. Each field below uses the exact label printed on the current Bureau revision. Where the form prints the label in all caps, this guide does the same so you can match the box on the page.
Box 1 — Employee Name (First, Middle, Last)
This box asks for the injured worker’s full legal name as it appears on their Social Security card. Type the first name, then middle name (or middle initial if that’s all you have), then last name, with no titles and no suffixes inside the name boxes — suffixes go in the dedicated suffix sub-box if the form revision shows one.
For example, Maria E. Rodriguez writes her name as Maria / E / Rodriguez. If the worker uses a hyphenated last name, keep the hyphen. If the worker recently married and changed names with the SSA, use the new name and note the prior name in the comments field.
A common nuance is nicknames. Workers often go by a nickname at work (Mike for Michael), but the form must use the legal name on file with the SSA, because the Bureau cross-checks the name against the SSN. The most common mistake here is entering the nickname, which then forces a manual correction in WCAIS and delays the first check by a full pay cycle. A widespread misconception is that the name only needs to “match the paystub” — it must match the SSA record, not the payroll record.
Box 2 — Social Security Number
Enter the worker’s nine-digit SSN in the format XXX-XX-XXXX. The SSN is the primary key for the WCAIS claim record, and an incorrect digit creates a duplicate claim that has to be merged by the Bureau’s help desk.
For example, Maria E. Rodriguez writes 123-45-6789. If the worker has an ITIN instead of an SSN (common for some undocumented workers, who are still covered under PA workers’ comp per Reinforced Earth Co. v. WCAB (Astudillo)), enter the ITIN and check the ITIN indicator if the form revision provides one.
The most common mistake is transposing two digits, which routes the claim to the wrong worker’s history and can cause the Bureau to send notices to the wrong address. The misconception that “the SSN doesn’t really matter because we have the name and date of birth” causes adjusters to skip verification — but the SSN is what the Bureau actually uses to match.
Box 3 — Date of Birth
Enter the worker’s date of birth in MM/DD/YYYY format. Pennsylvania requires four-digit years on every Bureau form, and a two-digit year will reject at the WCAIS gateway.
For example, Maria E. Rodriguez, born March 14, 1985, writes 03/14/1985. If the worker is a minor (under 18 at the time of injury), the form still uses the worker’s own date of birth, but the carrier must also confirm whether Section 320 of the Act applies — minors illegally employed receive 150% of the normal compensation rate.
The most common mistake is entering the date of injury in this box because both fields use the same format. The misconception that “age doesn’t affect the comp rate” is half-true: age does not change the rate for adults, but it triples the stakes for illegally employed minors.
Box 4 — Employee Mailing Address
Enter the street address, city, state, and ZIP code where the worker actually receives mail. This is where the Bureau and the carrier mail every notice, check (if not direct deposit), and IRE/IME scheduling letter.
For example, Maria E. Rodriguez writes 412 Spruce Street, Apt 3B, Reading, PA 19601. If the worker uses a P.O. Box, enter the P.O. Box on line 1 and leave line 2 blank — never combine a P.O. Box with a street address on the same line.
The most common mistake is using the worker’s old address from HR’s outdated file. The consequence is that benefit checks and IRE notices go to a stranger, which can cause a missed Impairment Rating Evaluation and an automatic loss of partial-disability protection under Section 306(a.3). The misconception that “the worker can just call to update the address later” ignores that the wrong address may delay the first check past the 21-day window, which itself triggers a separate penalty.
Box 5 — Employee Phone Number
Enter the worker’s primary phone number with area code in (XXX) XXX-XXXX format. This is the number the adjuster, the panel-provider scheduler, and the Bureau use for urgent contact.
For example, Maria E. Rodriguez writes (610) 555-0142. If the worker has only a work phone (now unavailable because of the injury), ask for a personal cell or a relative’s phone — never list the employer’s number here.
The most common mistake is leaving the box blank because the adjuster “doesn’t have it yet.” Blank phone fields in WCAIS sometimes pass validation but always cause downstream problems when the panel provider cannot reach the worker for the 90-day directed-care period. The misconception that “phone is optional” is wrong — Bureau guidance treats it as a required claimant-contact field.
Box 6 — Employer Name
Enter the employer’s full legal name exactly as it appears on the workers’ compensation policy declarations page, not the d/b/a name. The Bureau matches this name to the FEIN and NAIC carrier code.
For example, the employer is Keystone Construction Services, LLC, doing business as Keystone Build. Enter Keystone Construction Services, LLC — not Keystone Build.
The most common mistake is using the d/b/a name, which causes a coverage-verification mismatch and a Bureau request for a corrected filing. The misconception that “the d/b/a is fine because everyone knows it” ignores that the Bureau’s coverage database is keyed to the legal entity that holds the policy.
Box 7 — Employer FEIN
Enter the nine-digit Federal Employer Identification Number in XX-XXXXXXX format. The FEIN is how the Bureau verifies that the employer had active workers’ compensation coverage on the date of injury.
For example, Keystone Construction Services, LLC writes 23-4567890. If the employer is part of a multi-entity group with shared coverage, use the FEIN of the specific entity that employed the worker, not the parent.
The most common mistake is using the parent company’s FEIN when coverage is actually on a subsidiary’s policy. The consequence is a Section 305 uninsured-employer referral that takes weeks to unwind. The misconception that “any FEIN in the corporate family works” is wrong — coverage follows the FEIN on the policy.
Box 8 — Employer Mailing Address
Enter the employer’s mailing address for workers’ compensation matters, which may differ from corporate headquarters. This is where the Bureau sends employer-directed correspondence, including penalty notices.
For example, Keystone Construction Services, LLC writes 1500 Industrial Drive, Allentown, PA 18103. If the employer has a separate risk-management or claims address, use that address.
The most common mistake is using a job-site address. Job sites close, so penalty notices sent there get returned, and the Bureau treats unanswered notices as default admissions. The misconception that “headquarters is always right” can be wrong if the employer routes claims mail to a third-party administrator.
Box 9 — Date of Injury
Enter the exact date the injury occurred in MM/DD/YYYY format. For repetitive-trauma or occupational-disease claims, use the date the worker first knew, or should have known, that the condition was work-related — the Cinram date — under Section 311 of the Act.
For example, a single-event injury on April 7, 2026, is 04/07/2026. A repetitive carpal-tunnel claim where the worker first connected the symptoms to work on March 1, 2026, after a doctor’s visit, is 03/01/2026.
The most common mistake on occupational-disease claims is using the date of last exposure instead of the date of discovery, which can put the claim outside the three-year filing window. The misconception that “the injury date is always the day it hurt” misses how Pennsylvania’s discovery rule works for cumulative-trauma cases.
Box 10 — Time of Injury
Enter the time of injury in 24-hour or AM/PM format as the form revision shows. This field matters because it is used to determine whether the worker was “in the course of employment” at that moment.
For example, 2:15 PM on the production floor. If the time is unknown (common for occupational-disease claims), enter Unknown rather than guessing.
The most common mistake is guessing, which creates conflicts with the worker’s incident statement and supports a later challenge to the claim. The misconception that “time doesn’t matter once the claim is accepted” is wrong on travel and break-time injuries, where the moment of injury controls coverage.
Box 11 — Date Disability Began
Enter the first day the worker was unable to perform their job because of the injury. This is not the date of injury unless the worker stopped working that same day.
For example, Maria E. Rodriguez was injured on April 7, 2026, but worked a half-day, then went home and did not return. Her date disability began is 04/07/2026. If she had finished her shift and not returned the next day, the date would be 04/08/2026.
The most common mistake is using the date of injury automatically, which misstates the seven-day waiting period and the start of indemnity. The misconception that “disability begins when the doctor writes the note” ignores that disability legally begins when the worker stops earning their pre-injury wage.
Box 12 — Date Employer Notified
Enter the date the employer first received notice of the injury, in any form, from any source. Section 311 requires notice within 120 days, and the 21-day deadline to file LIBC-501 runs from this date — not from the injury date.
For example, the worker was injured on April 7 but did not tell the supervisor until April 10; the date employer notified is 04/10/2026. The carrier then has until 05/01/2026 to file LIBC-501.
The most common mistake is using the date of injury here when notice actually came later, which artificially shortens the 21-day window. The misconception that “notice means written notice” is wrong — verbal notice to a supervisor counts, and so does the supervisor witnessing the injury.
Box 13 — Description of Injury (Body Part and Nature)
Describe every body part injured and the nature of each injury. Use plain language plus ICD-10 codes when possible. This box is the single most consequential field on the form because the carrier is bound to pay for whatever is listed and can refuse to pay for what is not.
For example, Maria E. Rodriguez writes Lumbar strain and L4-L5 disc herniation (M51.26); right shoulder rotator cuff tear (M75.101). List every body part, even if one seems minor, because adding body parts later requires a Review Petition under Cinram Manufacturing v. WCAB (Hill).
The most common mistake is writing a one-word description like Back and stopping there. The consequence is years of fights over whether the shoulder, neck, or psychological component is part of the accepted injury. The misconception that “we can always add body parts later” is technically true but expensive — every addition requires a petition and litigation costs that dwarf the time it would have taken to list everything up front.
Box 14 — Body Part Code
Enter the standard EDI body-part code that matches the description in Box 13. For multi-body-part injuries, list a primary code and use the supplemental fields for additional codes.
For example, Maria E. Rodriguez’s lumbar injury uses code 42 (Lower Back), with shoulder code 31 (Shoulders) in the supplemental field.
The most common mistake is using 90 (Multiple Body Parts) as a shortcut, which provides no useful data and triggers a Bureau follow-up. The misconception that “the code is just for statistics” ignores that the codes drive panel-provider specialty matching.
Box 15 — Cause of Injury Code
Enter the EDI cause-of-injury code that describes how the injury happened. Common codes include 01 (Burn or Scald), 02 (Cut/Puncture), 15 (Lifting), 27 (Strain — Continual Noise), and 82 (Cumulative — All Other).
For example, Maria E. Rodriguez lifted a 60-pound box and felt her back pop. Her cause code is 15 (Lifting).
The most common mistake is using 99 (Other) when a specific code fits. The consequence is delayed claim-trend reporting and sometimes an audit. The misconception that “the cause code can be vague because the description is detailed” ignores the EDI validation rules.
Box 16 — Average Weekly Wage (AWW)
Enter the worker’s Average Weekly Wage calculated under Section 309 of the Pennsylvania Workers’ Compensation Act. The AWW is built from the four highest of the last four 13-week quarters before the injury, including overtime, bonuses, and the value of board and lodging when furnished.
For example, Maria E. Rodriguez earned $15,600, $14,800, $16,200, and $15,000 in the four quarters before injury. Her AWW is the average of the three highest quarters divided by 13: (15,600 + 16,200 + 15,000) / 3 / 13 = $1,200.00. Use Form LIBC-494A to show the math.
The most common mistake is using base wages only and excluding overtime, which understates the AWW and triggers penalty exposure under Hannaberry HVAC v. WCAB (Snyder). The misconception that “the AWW is just gross pay divided by 52” ignores Section 309’s quarter-based formula.
Box 17 — Weekly Compensation Rate
Enter the weekly compensation rate based on the AWW and the year-of-injury Statewide Average Weekly Wage (SAWW) published by the Bureau. The rate is calculated under Section 306(a):
[ \text{Rate} = \begin{cases} \tfrac{2}{3} \cdot \text{AWW} & \text{if AWW} > 1.5 \cdot \text{SAWW} \ \tfrac{2}{3} \cdot \text{AWW} & \text{if AWW between 0.5 and 1.5} \cdot \text{SAWW} \ 0.90 \cdot \text{AWW} & \text{if AWW} \leq 0.4097 \cdot \text{SAWW} \end{cases} ]
For example, Maria E. Rodriguez’s AWW of $1,200.00 in 2026 (when the SAWW is $1,325.00) yields a rate of $800.00 per week (two-thirds of AWW), capped at the maximum $1,325.00.
The most common mistake is forgetting the maximum cap or applying the wrong year’s SAWW. The misconception that “the rate is always two-thirds of wages” ignores the 90% rule for low-wage workers and the cap for high-wage workers.
Box 18 — Date Compensation Begins
Enter the first date for which indemnity is owed. Under Section 306(e), the worker is not paid for the first seven days of disability unless the disability lasts 14 days or more, in which case the seven-day waiting period is paid retroactively.
For example, Maria E. Rodriguez’s disability began 04/07/2026 and lasted more than 14 days. Compensation begins 04/14/2026, with the waiting-period days 04/07/2026 through 04/13/2026 paid once the 14-day threshold is reached.
The most common mistake is starting compensation on the date of injury and ignoring the waiting period, which over-pays the claim in short-duration cases. The misconception that “the worker always gets paid from day one” misses the seven-day rule entirely.
Box 19 — Medical Only Indicator
Check this box only if the worker is receiving medical treatment but no wage-loss benefits. Medical-only claims do not require a Statement of Wages on Form LIBC-494A.
For example, Daniel Park, an office worker, sprained his wrist, missed no work, and only needs physical therapy. His LIBC-501 is filed with the Medical Only box checked.
The most common mistake is checking Medical Only when the worker actually missed three days of work, which underpays the claim. The misconception that “Medical Only means we never pay wage loss” is wrong — the box can be unchecked later via a Supplemental Agreement (LIBC-337) if disability begins.
Box 20 — Insurance Carrier and NAIC Code
Enter the insurance carrier’s full legal name and five-digit NAIC code. Self-insured employers enter Self-Insured and the Bureau-assigned self-insurance number.
For example, Liberty Mutual Insurance Company, NAIC 23035. If the policy is written by a captive or a guaranty fund, use the captive’s NAIC code, not the fronting carrier’s.
The most common mistake is using the broker’s name instead of the carrier’s. The consequence is a coverage-mismatch rejection at WCAIS. The misconception that “the broker handles everything” ignores that only the carrier of record can file Bureau forms.
Box 21 — Claim Number
Enter the carrier’s internal claim number. This is the number the carrier uses in its own claim system; the Bureau will assign a separate WCAIS claim number once the form is processed.
For example, Liberty Mutual claim number WC2026-0048721.
The most common mistake is leaving this blank because “WCAIS will assign one.” The Bureau still wants the carrier’s number for cross-reference, and a blank field can delay processing. The misconception that “the WCAIS number replaces the carrier number” is wrong — both numbers travel with the claim forever.
Box 22 — Preparer Signature, Title, Date, and Phone
The adjuster, claims supervisor, or self-insured representative signs, prints their title, dates the form, and provides a direct phone number. Electronic signatures are accepted in WCAIS through the user’s authenticated session.
For example, Sarah Thompson, Senior Claims Adjuster, 04/26/2026, (215) 555-0199.
The most common mistake is using a generic department phone instead of a direct line, which causes the Bureau to leave voicemails that no one returns. The misconception that “any employee can sign” is wrong — only an authorized representative may bind the carrier.
Three Filled-Out Examples Using Real Scenarios
Scenario 1 — Carlos Mendoza, Construction Worker, Full Wage Loss (Accepted)
Carlos is a 38-year-old framer for Keystone Construction Services, LLC. On April 7, 2026, he fell from a ladder, fracturing his right ankle and tearing his right rotator cuff. He has been out of work since the injury date.
| Form Section | What Carlos’s Carrier Enters |
|---|---|
| Employee Name (Box 1) | Carlos A. Mendoza |
| SSN / DOB (Boxes 2–3) | 234-56-7890 / 06/22/1987 |
| Address / Phone (Boxes 4–5) | 812 Hamilton Blvd, Allentown, PA 18103 / (484) 555-0167 |
| Employer / FEIN (Boxes 6–7) | Keystone Construction Services, LLC / 23-4567890 |
| Date of Injury / Notice (Boxes 9, 12) | 04/07/2026 / 04/07/2026 |
| Description (Box 13) | Right ankle bimalleolar fracture (S82.841A); right shoulder rotator cuff tear (M75.101) |
| AWW / Rate (Boxes 16–17) | $1,485.00 / $990.00 |
| Date Comp Begins (Box 18) | 04/14/2026 (waiting period paid retroactively) |
| Medical Only (Box 19) | Unchecked |
| Carrier / Claim # (Boxes 20–21) | Liberty Mutual Insurance Company / WC2026-0048721 |
Scenario 2 — Daniel Park, Office Worker, Medical Only
Daniel is a 29-year-old paralegal for Harbor & Lane LLP in Pittsburgh. On May 3, 2026, he tripped over a floor cable and sprained his right wrist. He missed no work and is treating with a hand specialist.
| Form Section | What Daniel’s Carrier Enters |
|---|---|
| Employee Name (Box 1) | Daniel J. Park |
| SSN / DOB (Boxes 2–3) | 345-67-8901 / 09/11/1996 |
| Address / Phone (Boxes 4–5) | 2208 Murray Avenue, Pittsburgh, PA 15217 / (412) 555-0144 |
| Employer / FEIN (Boxes 6–7) | Harbor & Lane LLP / 27-8901234 |
| Date of Injury / Notice (Boxes 9, 12) | 05/03/2026 / 05/03/2026 |
| Description (Box 13) | Right wrist sprain (S63.501A) |
| AWW / Rate (Boxes 16–17) | Not required — Medical Only |
| Date Comp Begins (Box 18) | N/A |
| Medical Only (Box 19) | Checked |
| Carrier / Claim # (Boxes 20–21) | The Hartford / 26-WC-0033118 |
Scenario 3 — Aisha Williams, Warehouse Picker, Occupational Disease (Cumulative Trauma)
Aisha is a 45-year-old order picker at Susquehanna Logistics, Inc. in Harrisburg. After three years of repetitive lifting, she was diagnosed with bilateral carpal tunnel syndrome on March 1, 2026, and her doctor connected it to work that day. She also held a part-time weekend job as a cashier earning $240/week.
| Form Section | What Aisha’s Carrier Enters |
|---|---|
| Employee Name (Box 1) | Aisha M. Williams |
| SSN / DOB (Boxes 2–3) | 456-78-9012 / 11/04/1980 |
| Address / Phone (Boxes 4–5) | 619 Derry Street, Harrisburg, PA 17104 / (717) 555-0188 |
| Employer / FEIN (Boxes 6–7) | Susquehanna Logistics, Inc. / 45-6789012 |
| Date of Injury / Notice (Boxes 9, 12) | 03/01/2026 (Cinram date) / 03/02/2026 |
| Description (Box 13) | Bilateral carpal tunnel syndrome (G56.00) — occupational disease per Section 108(n) |
| AWW / Rate (Boxes 16–17) | $1,040.00 (includes concurrent employment under Section 309(e)) / $693.33 |
| Date Comp Begins (Box 18) | 03/08/2026 |
| Medical Only (Box 19) | Unchecked |
| Carrier / Claim # (Boxes 20–21) | Zurich American Insurance Co. / WC-PA-2026-09887 |
How to File the Completed Form
Pennsylvania accepts LIBC-501 through three channels. Most carriers must use EDI; small employers and pro se filers can use paper or in-person filing.
- EDI through WCAIS. This is the required channel for any carrier writing more than a handful of PA claims. Filing fee: none. Processing time: real-time validation, with an EDI acknowledgment within minutes. Proof of filing: save the EDI Transaction Acknowledgment (TA) and the WCAIS confirmation email.
- Paper filing by mail. Self-insured employers without EDI access mail the signed PDF to Bureau of Workers’ Compensation, 1171 South Cameron Street, Room 324, Harrisburg, PA 17104-2501. Filing fee: none. Processing time: 7–14 business days. Proof of filing: send by Certified Mail, Return Receipt Requested and keep the green card.
- In-person filing. The Bureau accepts walk-in filings at the Harrisburg address above during business hours. Filing fee: none. Processing time: same-day stamp. Proof of filing: keep the date-stamped copy the clerk hands back.
- Fax filing. No longer accepted for LIBC-501 as of the Bureau’s 2018 EDI mandate. A fax filing will not stop the 21-day clock.
Whichever channel is used, the carrier must also mail a copy of the filed form to the injured worker at the address in Box 4, and a copy to the worker’s attorney if one is on file. Failure to serve the worker is a separate ground for a penalty petition.
What Happens After You File
Once LIBC-501 is filed, the Bureau assigns a WCAIS claim number, and the carrier must begin paying the weekly compensation rate listed in Box 17 within 21 days of notice. Late first checks trigger 10% interest under Section 406.1(a) and possible penalties up to 50% under Section 435. The first check should reach the worker within five business days of the filing date, with subsequent checks on the carrier’s normal pay cycle.
The worker receives a copy of the form and a Workers’ Compensation Claimant Information Packet, which explains their rights, the IRE process, the panel-provider 90-day rule, and the petition options. The injured worker should compare every box on LIBC-501 against their own records — wrong AWW and missing body parts are the two most challenged entries.
If the worker disagrees with anything on the form, they can file a Review Petition through WCAIS to ask a Workers’ Compensation Judge to correct the AWW, expand the injury description, or modify the compensation rate. The carrier, on its side, can later file a Termination, Modification, or Suspension Petition if medical evidence supports it. Neither side can simply rewrite the LIBC-501 unilaterally once it is on file.
Mistakes to Avoid When Filling Out the Form
- Filing LIBC-501 instead of LIBC-495 when investigation is incomplete — costs the carrier the 90-day revocation window.
- Listing only one body part in Box 13 — every later body part requires a Review Petition and litigation cost.
- Calculating AWW without overtime or bonuses — violates Section 309 and triggers penalties under Hannaberry.
- Using the date of injury as the date employer notified — artificially shortens the 21-day deadline and creates evidentiary problems.
- Skipping concurrent-employment wages — undercuts the AWW and exposes the carrier to a Review Petition with retroactive interest.
- Applying the wrong year’s SAWW — caps the rate incorrectly and forces a corrected filing.
- Forgetting the 90% rule for low-wage workers — underpays the most vulnerable claimants.
- Using a d/b/a name in Box 6 — causes a coverage-verification mismatch in WCAIS.
- Checking Medical Only when the worker missed more than three days — converts a wage-loss case into a denial fight.
- Filing without serving the worker a copy — independent ground for a Section 435 penalty petition.
- Entering a P.O. Box with a street address on the same line — fails USPS routing and delays checks.
- Using a generic phone in Box 22 — Bureau and worker cannot reach a real adjuster, which prolongs disputes.
Do’s and Don’ts
Do’s: – Do pull the AWW from a fully completed LIBC-494A so the math is auditable. – Do list every body part and every diagnosis code in Box 13, even ones that seem minor. – Do file through WCAIS EDI when available because the time-stamp is automatic. – Do mail the worker a copy the same day the form is filed. – Do use the legal entity name in Box 6, not the d/b/a. – Do keep the certified-mail green card or EDI acknowledgment for at least the statute of repose (500 weeks).
Don’ts: – Don’t file LIBC-501 if you may need to revoke acceptance — file LIBC-495 instead. – Don’t round the AWW down to the nearest dollar; use cents because the rate calculation is sensitive. – Don’t leave the time-of-injury field blank — enter Unknown if needed. – Don’t use 99 Other for cause of injury when a specific code fits. – Don’t sign the form on behalf of an unauthorized party. – Don’t assume the worker will catch your errors — they often do, and they petition for penalties when they do.
Pros and Cons of Filing on Your Own vs. With Help
Pros of filing without an attorney or TPA: – Lower administrative cost on routine medical-only claims. – Faster turnaround for in-house adjusters who already know the worker. – Direct control over the injury description and AWW math. – No fee-splitting under the Section 442 attorney-fee rules. – Immediate access to the WCAIS account without third-party login coordination.
Cons of filing without help: – High exposure on AWW math, especially for tipped, seasonal, or concurrent workers. – Easy to miss the Cinram discovery date on occupational-disease claims. – Risk of choosing the wrong form (LIBC-501 vs. LIBC-495) and losing the 90-day window. – Penalty petitions under Section 435 are common when self-filers miss the 21-day deadline. – Misclassification of medical-only versus wage-loss claims creates downstream litigation.
FAQs
Is LIBC-501 the same as LIBC-495?
No. LIBC-501 is a full acceptance with no revocation right. LIBC-495 is a temporary acceptance the carrier can revoke within 90 days using LIBC-502 and LIBC-761.
Can the injured worker file LIBC-501?
No. Only the employer, insurance carrier, or third-party administrator files LIBC-501. The worker receives a copy by mail.
Do I write the legal name or d/b/a in Box 6?
Yes — write the legal name on the policy. The d/b/a will not match the Bureau’s coverage database and will cause a rejection.
Is the Box 9 date of injury the same as the date employer was notified?
No. Box 9 is when the injury happened; Box 12 is when the employer learned of it. The 21-day clock runs from Box 12.
Should I list every body part in Box 13?
Yes. Anything not listed will later be argued as outside the accepted injury, and adding body parts later requires a Review Petition.
Is overtime included in the AWW?
Yes. Section 309 and Hannaberry HVAC v. WCAB require including overtime, bonuses, and the value of board and lodging when furnished.
Do I include concurrent-employment wages in Box 16?
Yes — when the worker held a second job at the time of injury, Section 309(e) requires those wages to be added to the AWW.
Is there a filing fee for LIBC-501?
No. The Bureau of Workers’ Compensation charges no fee for filing LIBC-501 through any channel.
Can I file LIBC-501 by fax?
No. The Bureau ended fax filing in 2018. EDI through WCAIS, paper by mail, or in person are the only valid channels.
Does checking Medical Only mean we never pay wage loss?
No. If disability begins later, the carrier files a Supplemental Agreement on LIBC-337 to convert the claim to wage loss.
Is the worker paid from the date of injury?
No. The first seven days are unpaid unless disability lasts 14 days or more, at which point the waiting period is paid retroactively.
Do I use the date of last exposure for an occupational disease?
No. Use the Cinram discovery date — the date the worker first knew or should have known the condition was work-related.
Is an electronic signature in WCAIS valid in Box 22?
Yes. The authenticated WCAIS session counts as the signature; no wet-ink signature is required for EDI filings.
Does filing LIBC-501 stop the 21-day clock immediately?
Yes — once the EDI Transaction Acknowledgment posts or the certified-mail green card is signed, the filing is timely.
Related reading
- How to Fill Out Pennsylvania Form LIBC-336 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form LIBC-337 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form LIBC-344 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form LIBC-378 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form LIBC-410 (w/Examples) + FAQs
- How to Fill Out Pennsylvania Form LIBC-757 (w/Examples) + FAQs
- How to Fill Out California WCAB DWC-AD 1 (w/Examples) + FAQs