Form N-648 is for a naturalization applicant with a medical condition. On it, a physician certifies that the condition prevents the person from learning English and civics. Dementia or a significant stroke are examples. When the certification is accepted, the testing requirement is waived. Then citizenship proceeds.
Every year, it happens across St. Louis. Older lawful permanent residents are denied the final chapter of their American story. It is not because they fail to qualify for citizenship. It is because a medical condition makes learning English and civics impossible in any language.
The Problem Federal Law Already Solved
Grandparents from Bosnia, Vietnam, Mexico, Ethiopia, India. They are lawful permanent residents who built lives here for decades. Then they reach the naturalization stage and hit a wall: the English and civics test. Think of someone with dementia, a significant stroke, or another serious medical condition. No amount of study fixes the problem. That is because the condition itself has taken away the ability to learn and remember.
Congress saw this coming. Form N-648 is the Medical Certification for Disability Exceptions. On it, a physician can certify one thing. A medically determinable physical or developmental disability or mental impairment prevents the applicant from learning or demonstrating the required knowledge. When properly certified and accepted, the testing requirement is waived. Then citizenship proceeds.
Why don’t more families use the N-648 waiver?
Three reasons. They have never heard of it. They have been told (wrongly) that any illness rules their loved one out of citizenship entirely. Or they tried once with a rushed form and were turned down. The N-648 is a demanding document. It requires a real clinical evaluation and objective findings. It also needs a clear link, called the nexus, between the diagnosis and the inability to test.
How does an N-648 evaluation work in St. Louis?
Dr. Gurpreet Singh Padda, MD, MBA, MHP performs N-648 evaluations in St. Louis. He reviews records. He uses a validated cognitive assessment (he is a MoCA-certified rater). Testing is done with an interpreter in the patient’s own language. The paperwork is written to USCIS’s actual standards. The case review fee is $400, credited toward the full evaluation, which starts at $1,400.
Related reading: Citizenship Test Waiver, Accommodation or Age Exemption · PTSD, Stroke and Invisible Illness: N-648 Waiver · N-648 Evidence Checklist: Medical Records to Gather · Form N-648 Disability Waiver Evaluation
Frequently Asked Questions
What is Form N-648?
It is the Medical Certification for Disability Exceptions. A physician fills out this form. On it, the doctor certifies one thing. A qualifying medical condition prevents a naturalization applicant from learning or demonstrating English and civics knowledge.
Who Qualifies for the N-648? A Doctor Explains the Medical Criteria goes through it in detail.
Does having a serious illness disqualify someone from citizenship?
No. It is the opposite. Federal law provides the N-648 waiver for this exact reason. It keeps qualifying medical conditions from blocking naturalization. That is for people who are otherwise eligible.
What conditions typically qualify?
Dementia is the most common. Significant stroke can also qualify. So can developmental disabilities and severe chronic psychiatric conditions. Each must be properly documented with objective findings. Each also needs a clear nexus to the inability to test.
Watch the full video above, and explore the rest of the series on our YouTube channel.
When They Can’t Understand the Oath: The Oath Waiver Explained covers a separate waiver. It is for people who cannot understand the naturalization oath.
Schedule Your Exam in St. Louis
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Dr. Gurpreet Padda, MD — USCIS-Designated Civil Surgeon (CSID 111051)
4477 Woodson Rd, Suite 102, St. Louis, MO 63134 — minutes from St. Louis Lambert International Airport
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💵 I-693 exam $390 · Follow-up visit $190 · N-648 case review $400 (credited toward evaluation) · N-648 evaluation from $1,400
This article is educational information about the immigration medical examination process. It is not legal advice and does not create a physician–patient relationship. For legal questions about your case, consult a licensed immigration attorney.
Medically reviewed by Dr. Gurpreet Singh Padda, MD, MBA, MHP — USCIS-designated civil surgeon (CSID 111051), board certified in Anesthesiology, Pain Medicine, Interventional Pain Management, Addiction Medicine, and Obesity Medicine. Last reviewed September 2026.