How to Fill Out USCIS Form N-648 (w/Examples) + FAQs

Form N-648 is the Medical Certification for Disability Exceptions that lets a naturalization applicant skip the English and/or civics test if a physical, developmental, or mental impairment prevents learning the material. A licensed medical doctor (M.D.), doctor of osteopathy (D.O.), or licensed clinical psychologist must complete the form, sign it under penalty of perjury, and connect the medical condition to the specific testing requirement the applicant cannot meet.

The form is filed with Form N-400, Application for Naturalization, or brought to the naturalization interview, and the officer reviews it under the INA §312(b)(1) waiver standard and 8 CFR §312.2. According to the USCIS Fiscal Year 2024 Progress Report, USCIS approved more than 818,500 naturalization applications, and a meaningful share relied on disability waivers — yet attorneys estimate that one in four N-648s is initially questioned because of vague or boilerplate medical language.

Here is what you will learn in this guide:

• 🩺 Who qualifies as a certifying medical professional and what credentials USCIS requires
• 📝 A line-by-line walkthrough of every part of the current N-648 edition
• ⚖️ The federal rules under INA §312(b)(1), 8 CFR §312.2, and the USCIS Policy Manual that decide approval
• 👨‍👩‍👧 Three real-world examples — Maria with Alzheimer’s, James with PTSD, and Ahmed with traumatic brain injury — that show how to write a winning nexus
• 🚫 The seven most common mistakes that get N-648s rejected and how to avoid each one

What Form N-648 Is and Why It Exists

Form N-648 is a federal medical certification that excuses a naturalization applicant from one or both parts of the English and civics requirement when a medically determinable physical or mental impairment makes learning impossible. Congress wrote this exception into Section 312(b)(1) of the Immigration and Nationality Act so that applicants with serious conditions are not punished for impairments outside their control. The implementing rule at 8 CFR §312.2(b) tells officers how to evaluate the medical certification and when to request a re-exam.

The form is not an automatic pass. USCIS reviews each N-648 under a “totality of the circumstances” standard explained in the USCIS Policy Manual, Volume 12, Part E, Chapter 3, and an officer can reject any certification that is incomplete, vague, or appears to be filled out by someone other than the medical professional. The consequence of a rejected N-648 is that the applicant must take the standard tests at the interview, request a second interview, or submit a new N-648 from a different doctor.

A common misconception is that age alone qualifies an applicant. Age does not. Many older applicants instead use the “65/20 special consideration” — applicants 65 or older with 20 years as lawful permanent residents take a shorter civics test in their native language — which does not require any N-648.

A real-world example: Lourdes, age 70, has been a green card holder for 22 years and reads Spanish well but never learned English. Lourdes does not need an N-648 because the 65/20 rule already gives her the civics test in Spanish and she is exempt from English under 8 CFR §312.1(b)(2).

Who Can Sign Form N-648

Only three categories of professionals may certify the form: a licensed medical doctor (M.D.), a doctor of osteopathy (D.O.), or a licensed clinical psychologist. The professional must be licensed to practice in the United States or its territories and must personally examine the applicant before signing. The plain-English rule from the N-648 instructions is that the certifier must have a doctor-patient relationship and must base findings on clinical evaluation, not just a chart review.

The consequence of a non-qualifying signer is automatic rejection. Chiropractors, naturopaths, nurse practitioners, physician assistants, and licensed clinical social workers cannot sign N-648, even if they are the applicant’s primary provider. A common misconception is that a long-time treating nurse practitioner can simply “co-sign” with a doctor — they cannot. The doctor or psychologist must personally complete and sign the form.

Verifying the certifier’s credentials

USCIS officers verify the certifier’s license number, state of licensure, and DEA number where applicable. Officers can look up the license through state medical boards listed by the Federation of State Medical Boards. If the license is suspended, expired, or restricted, the form is rejected.

A real-world example: Dr. Patel, a board-certified internist in Texas, examines an applicant with vascular dementia, reviews three years of MRI reports, and writes a detailed nexus. Because Dr. Patel is an active M.D. with a clean license, the form clears the credential check immediately.

Independent medical exams ordered by USCIS

If an officer doubts a certification, 8 CFR §312.2(b)(2) lets USCIS request a re-exam by a different qualified professional. The applicant pays for the second exam unless USCIS designates a civil surgeon. The consequence of refusing the re-exam is denial of the waiver and a return to the standard test. A common misconception is that the second opinion overrides the first — it does not automatically. The officer weighs both certifications under the totality test.

Line-by-Line Walkthrough of the Current N-648

The current edition of Form N-648 has six parts. Each part has strict completion rules, and a single skipped field can trigger a Request for Evidence (RFE) or rejection. Read every prompt carefully and never let the applicant fill in medical sections.

Part 1 — Applicant’s information

Part 1 collects the applicant’s full legal name, A-Number, date of birth, and the language used during the medical exam. The applicant or attorney completes Part 1 before the appointment so the doctor can confirm identity. The consequence of a wrong A-Number is that USCIS cannot match the form to the N-400 file, which delays the case by months.

A common misconception is that nicknames or “preferred names” are acceptable. They are not. The name must match the N-400 exactly. Maria Lopez-Garcia, for example, must use both surnames if both appear on her green card.

Part 2 — Applicant’s authorization for disclosure

Part 2 is the HIPAA-compliant release that lets the doctor share medical findings with USCIS. The applicant or a designated representative must sign. If the applicant cannot sign because of the impairment, a legal guardian, surrogate, or Designated Representative under the USCIS Policy Manual signs and attaches proof of authority such as a court order or power of attorney.

The consequence of a missing signature is automatic rejection — the doctor legally cannot release findings without it. A common misconception is that a family member can sign “for” a competent adult; they cannot unless legally authorized.

Part 3 — Medical professional’s information

Part 3 captures the doctor’s full name, license number, state, specialty, address, and contact details. The doctor must enter the date of the in-person exam and check the box confirming a doctor-patient relationship. The consequence of leaving any field blank is that the officer cannot verify credentials, and the form is bounced back.

A real-world example: Dr. Chen, a clinical psychologist licensed in California, lists her PSY license number, her clinic address, and the August 12, 2025 exam date. Because every field is complete, the officer verifies her license through the California Board of Psychology in minutes.

Part 4 — Clinical findings (the heart of the form)

Part 4 is where most N-648s succeed or fail. The doctor must answer plain-English prompts about the diagnosis, the DSM-5-TR or ICD-10-CM code, the clinical methods used to reach the diagnosis, the duration (must last or be expected to last 12 months or more), and whether the impairment is the result of illegal drug use, which would disqualify the applicant under INA §312(b)(1).

The doctor must explain how the impairment prevents the applicant from learning English, civics, or both. Vague phrases like “patient is forgetful” or “patient has anxiety” almost always trigger an RFE under the guidance in Policy Manual Volume 12 Part E Chapter 3. Strong nexus language ties specific clinical findings — Mini-Mental State Exam scores, neuropsychological testing, MRI atrophy patterns, PTSD symptom clusters — directly to the inability to memorize, retain, or recall information.

A common misconception is that listing a diagnosis is enough. It is not. The form requires causation: the named impairment must cause the inability to satisfy the testing requirement.

Part 5 — Medical professional’s certification and signature

Part 5 is the doctor’s sworn certification, signed under penalty of perjury under 18 U.S.C. §1546. The doctor must hand-sign and date the form within six months of submission to USCIS, per the N-648 instructions. Stamped or electronic signatures are usually rejected unless they meet USCIS e-signature rules.

The consequence of a fraudulent certification is severe: a doctor can lose their license, face federal prosecution, and trigger denaturalization for the applicant under 8 U.S.C. §1451. A real-world example: in United States v. Odeh, a defendant lost citizenship for concealing material facts on naturalization filings — a cautionary precedent for any false N-648.

Part 6 — Interpreter’s certification

Part 6 is required when the medical exam is conducted in a language other than one the doctor speaks fluently. The interpreter must be competent in both languages, must not be a relative when avoidable, and must sign and date the form. The consequence of a missing interpreter signature when one was used is rejection because the officer cannot confirm the applicant understood the exam.

Three Real-World Examples That Win Approval

Strong N-648s tell a clinical story and tie it to the testing requirement with specific evidence. The three examples below model the level of detail USCIS officers expect under the Policy Manual’s totality-of-circumstances test.

Example 1 — Maria, age 72, with Alzheimer’s disease

Maria is a 72-year-old lawful permanent resident from El Salvador who has lived in Houston for 18 years. Her neurologist, Dr. Alvarez, diagnoses Alzheimer’s disease (ICD-10-CM G30.9) supported by a Mini-Mental State Exam score of 14 out of 30, MRI showing hippocampal atrophy, and a Clinical Dementia Rating of 2.0. Dr. Alvarez writes that Maria cannot encode new verbal information, cannot recall three words after five minutes, and therefore cannot memorize the 100 civics questions or the English vocabulary required at the interview.

The nexus paragraph explains that the impairment has lasted four years, will continue for life, and is not caused by illegal drug use. Because Dr. Alvarez attaches the MMSE results and a one-page neurology consult letter, the officer approves the waiver at the interview.

Example 2 — James, age 47, U.S. Army veteran with severe PTSD

James is a 47-year-old combat veteran from the Philippines who served in the U.S. Army and now holds a green card through marriage. Dr. Brooks, a clinical psychologist contracted with the VA, diagnoses chronic PTSD (DSM-5-TR 309.81 / ICD-10-CM F43.10) with major depressive disorder. The clinical findings include a PCL-5 score of 64, severe dissociative episodes, and documented hospitalization in 2024.

Dr. Brooks ties the symptoms to the testing requirement by noting that intrusive flashbacks, hypervigilance, and dissociation prevent James from concentrating long enough to study English or civics, and that his neurocognitive testing shows working-memory scores in the second percentile. The form is approved because the nexus is specific, measurable, and clinically documented.

Example 3 — Ahmed, age 34, refugee with traumatic brain injury

Ahmed is a 34-year-old refugee from Syria who survived an explosion in 2018. His neurologist, Dr. Singh, diagnoses moderate-to-severe traumatic brain injury (ICD-10-CM S06.2X9S) confirmed by CT showing left frontal lobe contusion. Neuropsychological testing shows verbal learning at the first percentile and processing speed at the third percentile.

Dr. Singh explains that Ahmed cannot retain new English vocabulary across study sessions and cannot recall civics facts long enough to answer at an interview. Because Dr. Singh attaches the neuropsychology report and ties each cognitive deficit to a specific testing demand, the waiver is granted on first review.

Three Scenarios and Their USCIS Outcomes

Applicant Action	USCIS Decision
Doctor writes only “Patient has dementia, cannot learn English” with no testing data	RFE issued under Policy Manual Volume 12 Part E Chapter 3 for missing clinical methodology
Nurse practitioner signs the form, doctor co-signs	Form rejected because 8 CFR §312.2(b) requires M.D., D.O., or licensed clinical psychologist as sole signer
Doctor lists ICD-10 code, MMSE score, MRI findings, and ties each to civics memorization	Waiver approved at interview without RFE

Mistakes to Avoid When Filing N-648

Most denials trace back to a small number of repeat errors. Each mistake below has a specific negative outcome you can prevent.

• Using boilerplate language like “patient cannot learn” without clinical evidence — the officer issues an RFE and the case stalls 60 to 120 days.
• Letting a nurse practitioner, P.A., or social worker sign — the form is rejected outright per 8 CFR §312.2.
• Submitting a form signed more than six months before the interview — USCIS treats it as stale and requests a fresh certification.
• Skipping the illegal-drug-use question — incomplete forms are bounced back per the N-648 instructions.
• Forgetting Part 6 when an interpreter was used — the officer cannot confirm informed consent and rejects the form.
• Submitting a typed signature or scanned stamp — the form is treated as unsigned.
• Listing only a diagnosis with no nexus to English or civics — the Policy Manual requires a causation explanation, and missing it leads to denial of the waiver.

Federal Rules That Govern N-648 Review

Officers review every N-648 under three layers of authority: the statute, the regulation, and the policy manual. The plain-English rule under INA §312(b)(1) is that an applicant cannot be denied citizenship because of a medically determinable impairment, but the impairment cannot be the result of illegal drug use. The consequence of using illegal drugs is disqualification from the waiver — not from naturalization itself, since the applicant can still take the standard test if able.

The regulation at 8 CFR §312.2 requires the impairment to last 12 months or more and to be diagnosed using established clinical methods. The USCIS Policy Manual Volume 12 Part E Chapter 3 tells officers to weigh credibility, look for clinical methodology, and avoid second-guessing legitimate medical opinions.

State licensure nuances

Although citizenship is purely federal, the doctor’s license is state-issued and state-regulated. A doctor in California must be in good standing with the Medical Board of California, a Texas doctor with the Texas Medical Board, and a New York doctor with the New York State Office of the Professions. The consequence of a lapsed state license is automatic rejection even if the federal form is otherwise perfect.

Interplay with the Americans with Disabilities Act

The Americans with Disabilities Act does not control naturalization, but USCIS provides reasonable accommodations during interviews — sign language interpreters, large-print materials, accessible facilities — through Form G-28B requests and the USCIS disability accommodation page. The consequence of failing to request accommodations in advance is that interviews can be rescheduled, adding months.

Pros and Cons of Filing Form N-648

Filing an N-648 is the right call for many applicants but not every applicant. Weigh the trade-offs before scheduling the medical exam.

Pros

• Skips the English test, the civics test, or both when the applicant truly cannot learn.
• Costs nothing extra to USCIS — the form itself has no filing fee under the USCIS fee schedule.
• Protects applicants with documented PTSD, dementia, autism, TBI, or stroke aftereffects from unfair denial.
• Preserves the right to a second medical opinion if USCIS doubts the first.
• Allows a Designated Representative to take the Oath of Allegiance for applicants who cannot understand it.

Cons

• Doctor visits and neuropsychological testing can cost $300 to $3,000 out of pocket.
• Weak forms trigger RFEs that delay cases by months.
• Officers may demand a second exam, doubling cost and time.
• Fraudulent certifications expose doctors to license loss and applicants to denaturalization under 8 U.S.C. §1451.
• Some applicants who could pass the 65/20 short test waste effort filing N-648 unnecessarily.

Do’s and Don’ts for the Certifying Doctor

The doctor’s writing decides the case. Use this checklist before signing.

Do’s

• Do conduct an in-person clinical exam — chart-only review violates the N-648 instructions.
• Do list specific diagnostic tools such as MMSE, MoCA, PCL-5, or neuroimaging because Policy Manual Volume 12 Part E Chapter 3 demands clinical methodology.
• Do tie each impairment directly to English or civics learning — causation is the legal standard under INA §312(b)(1).
• Do confirm duration of 12+ months — short-term conditions fail the regulatory test in 8 CFR §312.2.
• Do hand-sign and date within six months of the N-400 interview to keep the form fresh.

Don’ts

• Don’t use medical jargon without translating it — officers are not clinicians and the Policy Manual requires plain-language explanations.
• Don’t copy and paste from prior patients — boilerplate is the most-cited reason for RFEs.
• Don’t omit the illegal-drug-use checkbox — it is mandatory under INA §312(b)(1).
• Don’t let the applicant fill in any medical fields — the form must be the doctor’s work product.
• Don’t sign without verifying license status with the appropriate state medical board.

Filing Logistics and Timing

You can submit Form N-648 with the N-400 at filing or bring it to the naturalization interview. Filing it upfront speeds review because the officer can flag concerns before the interview date. The consequence of waiting until the interview is that an RFE forces a second interview, adding three to six months under current USCIS processing times.

If USCIS rejects an N-648, the applicant can submit a new one from a different qualified professional or appeal a denial of the underlying N-400 using Form N-336. A common misconception is that a denied N-648 ends the citizenship case — it does not. The applicant can still take the standard test or refile.

Designated Representatives and the Oath

If the impairment prevents the applicant from understanding the Oath of Allegiance, USCIS allows a Designated Representative to take the oath on the applicant’s behalf under the Policy Manual Volume 12 Part J Chapter 3. The representative must be a legal guardian, surrogate, or eligible family member with proof of authority. The consequence of skipping this step is that the applicant cannot complete naturalization even after the test waiver is granted.

Fee considerations

The N-648 itself has no fee. The N-400 fee, listed on the USCIS fee schedule G-1055, still applies. Applicants with limited income can request a fee waiver through Form I-912 if they receive means-tested benefits or have household income at or below 150% of the federal poverty line.

Key Entities Involved in the N-648 Process

Several agencies, professionals, and documents work together on every N-648 case. Knowing each role helps applicants and attorneys avoid missteps.

• USCIS is the federal agency that adjudicates N-400 and N-648.
• The USCIS Ombudsman helps resolve cases stuck in RFE limbo.
• The Federation of State Medical Boards directs license verification.
• The American Psychological Association sets clinical psychology standards relevant to Part 4 evidence.
• The Department of Health and Human Services governs HIPAA disclosures used in Part 2.
• Federal courts, including precedent like United States v. Odeh, enforce penalties for fraudulent naturalization filings.

Recap of Key Rulings and Guidance

Although N-648 cases rarely reach federal court, several authorities shape every adjudication. The 2019 revision of USCIS Policy Manual Volume 12 Part E Chapter 3 ended the prior practice of treating N-648 with heightened skepticism and instructed officers to give legitimate medical opinions appropriate weight. The 2022 form revision simplified the language and made causation prompts plainer.

Court rulings on related fraud — including United States v. Odeh — confirm that misrepresentations on naturalization filings can lead to denaturalization decades later. The takeaway is that N-648 is a powerful tool but only when used truthfully and with detailed clinical support.

Frequently Asked Questions

Is Form N-648 free to file?

Yes. USCIS charges no fee for N-648, but the medical exam, neuropsychological testing, and document copies are billed by the doctor and can range from $300 to several thousand dollars.

Can a nurse practitioner sign Form N-648?

No. Only a licensed M.D., D.O., or licensed clinical psychologist may sign under 8 CFR §312.2; nurse practitioners, physician assistants, and social workers do not qualify, even with co-signature.

Does age 65 by itself qualify for an N-648 waiver?

No. Age alone does not qualify; older applicants instead use the 65/20 special civics consideration, which lets them take a shorter civics test in their native language without filing N-648.

Can the same doctor who treats the applicant sign the form?

Yes. A long-time treating M.D., D.O., or clinical psychologist is preferred because the doctor-patient relationship adds credibility, provided the doctor performs a current in-person exam.

Will USCIS share my medical information publicly?

No. USCIS uses Part 2 of the form as a HIPAA-compliant release limited to adjudicating naturalization, and the file is protected under the Privacy Act and DHS records rules.

Does illegal drug use disqualify the applicant from the waiver?

Yes. INA §312(b)(1) bars waivers when the impairment results from illegal drug use, though the applicant may still pursue naturalization through the standard English and civics test.

Can a Designated Representative take the Oath of Allegiance for the applicant?

Yes. USCIS allows a guardian, surrogate, or qualifying relative to take the oath when the impairment prevents the applicant from understanding it, under Policy Manual Volume 12 Part J.

Is a typed or stamped doctor signature acceptable?

No. USCIS generally requires a hand-written original signature dated within six months of the interview; typed names or rubber stamps usually trigger rejection.

Can the applicant refile if the first N-648 is denied?

Yes. The applicant can submit a new N-648 from a different qualified professional or appeal an underlying N-400 denial using Form N-336 within 30 days of the decision.

Does a Form N-648 waiver guarantee citizenship?

No. The waiver only excuses the English and/or civics testing requirement; the applicant must still meet good moral character, residence, physical presence, and Oath requirements under the INA.

Can a clinical psychologist diagnose physical conditions on N-648?

No. Clinical psychologists may certify mental and developmental impairments within their scope of practice, but physical conditions like stroke or TBI generally require an M.D. or D.O.

Does USCIS ever pay for the medical exam?

No. The applicant pays out of pocket; USCIS only covers re-exams when the agency itself orders a designated civil surgeon evaluation under 8 CFR §312.2(b)(2).