Direct answer: U.S. immigration law lets an officer deny a green card or visa on health-related grounds in four situations: you have a communicable disease of public health significance, you're missing vaccinations required for your age group, you have a physical or mental disorder combined with harmful behavior connected to it, or you currently abuse or are addicted to a controlled substance. These issues almost always come up through the required immigration medical exam. Some of them can be fixed on the spot or waived; one of them (current drug abuse/addiction) cannot be waived at all.
The four health-related grounds
These grounds come from Immigration and Nationality Act (INA) § 212(a)(1). They apply whether you're adjusting status inside the United States or applying for an immigrant visa at a U.S. consulate abroad.
Communicable disease of public health significance. Federal regulations (through the Department of Health and Human Services) define which conditions count. Historically this list has included active, infectious tuberculosis and certain sexually transmitted infections, plus any disease that triggers a federal quarantine order. Because this list can change, don't rely on an old list - the civil surgeon or panel physician applies whatever list is current at the time of your exam.
Missing required vaccinations. You must show proof of vaccinations recommended by the CDC's Advisory Committee on Immunization Practices, applied to your age category. Which vaccines are required changes over time and by age - the CDC publishes current technical instructions for civil surgeons, and USCIS's Policy Manual (Volume 8, Part B, Chapter 9) reflects the current rule. For example, as of January 2025 USCIS waived the COVID-19 vaccination documentation requirement for adjustment-of-status (Form I-693) filers inside the U.S., which shows how quickly this list can shift; because a change like this can be reversed, confirm the current required vaccines before your exam.
Physical or mental disorder with associated harmful behavior. This is not a bar on having a mental health condition by itself. It requires both a diagnosed disorder and harmful behavior connected to it - current harmful behavior, or a past episode that's likely to recur.
Drug abuse or drug addiction. This covers current substance-use or substance-induced disorders involving a controlled substance, as defined using the DSM. It is about current abuse or addiction, not a past history that's since resolved.
Where this comes up: the medical exam
For almost everyone, these grounds surface through a required medical exam, not a courtroom-style hearing:
Adjustment of status (green card from inside the U.S.): a USCIS-designated civil surgeon completes Form I-693, Report of Immigration Medical Examination and Vaccination Record, which is filed with your Form I-485 application.
Immigrant visa processing abroad: a State Department-approved panel physician conducts the equivalent exam as part of your consular immigrant visa case. Note that vaccination requirements for consular applicants abroad are set separately and can differ from what USCIS requires for filers inside the U.S.
The civil surgeon or panel physician documents findings; USCIS or the consular officer makes the actual inadmissibility determination based on that report - the doctor doesn't decide your case, but a problematic report is often what triggers the issue.
Validity of Form I-693: Under current USCIS policy, a properly completed Form I-693 signed by the civil surgeon on or after November 1, 2023 generally remains valid evidence for as long as the specific application it was filed with stays pending - it is no longer tied to a fixed two-year expiration in most cases, but it also generally does not carry over to a separate, later application if the first one is withdrawn or denied. Older exams signed before that date follow the prior two-year rule. Because USCIS has changed this policy more than once and can do so again, confirm the current rule at uscis.gov/i-693 before you rely on the timing of an older exam.
Waivers: what's available for each ground
Where a waiver exists, it is generally requested on Form I-601, Application for Waiver of Grounds of Inadmissibility, filed with USCIS.
Communicable disease waiver
A discretionary waiver under INA § 212(g)(1) may be available, generally for applicants who are the spouse, unmarried son or daughter, or minor child of a U.S. citizen or lawful permanent resident, or of someone who holds an immigrant visa; who has such a qualifying relative; or who is a VAWA self-petitioner. USCIS sets any terms or conditions on the waiver, sometimes after consulting with HHS.
Vaccination waiver
Two paths exist:
A civil-surgeon (blanket) waiver when a medical professional determines the vaccine isn't medically appropriate for you (for example, due to age, pregnancy, or a medical contraindication), or you've already received it - this typically doesn't require a separate form or fee.
An individual waiver based on religious belief or moral conviction, filed on Form I-601. USCIS requires the objection to be sincere, longstanding, and to oppose vaccination in general - not a selective objection to one particular vaccine while accepting others. Political, philosophical, or personal-safety objections don't qualify for this specific waiver.
Physical or mental disorder with harmful behavior
A discretionary waiver is available. USCIS decides whether to grant it, and under what conditions (which can include a treatment or monitoring plan), typically after consulting HHS guidance.
Drug abuse or addiction
There is no waiver for this ground while the abuse or addiction is current. Instead, the path forward is a medical finding that the condition is in remission. If it is current, the underlying immigration case generally cannot move forward on the medical piece until that changes.
What to do
Find an authorized examiner. Inside the U.S., use USCIS's online tool to find a designated civil surgeon. Abroad, your visa instructions from the consulate will list an approved panel physician - don't use just any doctor.
Bring complete vaccination records. Missing paperwork is often mistaken for a missing vaccine. Bring any records you have, including from your home country.
Get vaccinated at the exam if you're missing shots. The civil surgeon can typically administer needed vaccines the same day, or document why one isn't appropriate for you.
Disclose accurately. Don't hide a medical history or a past arrest/treatment record connected to substance use or mental health - inaccurate answers can create separate fraud or misrepresentation problems on top of the medical ground.
If a ground is flagged, get an accurate read on waiver eligibility. A qualifying relationship, remission status, or the sincerity of a religious objection are fact-specific determinations - this is a good point to consult a qualified immigration attorney or a Department of Justice-accredited representative before you file anything.
File the waiver with, or as instructed relative to, your underlying application. Timing and required evidence vary by category and by whether you're filing inside the U.S. or through a consulate - follow the specific instructions on the current Form I-601 and its instructions at uscis.gov/i-601.
Check current fees and processing times yourself. Filing fees change, and there is no fixed nationwide processing time for I-601 waivers - use the USCIS fee schedule and case processing time tool on uscis.gov rather than a number you saw somewhere else.
There's no single fixed statutory deadline attached to these medical grounds the way there is for, say, a one-year asylum filing window. But a denied or delayed medical finding can stall or jeopardize an entire pending green card or visa case, and a missed response to a Request for Evidence tied to your I-693 or I-601 can result in denial - treat any USCIS deadline in your own notice as firm.
Beware immigration fraud. Only a licensed attorney or a representative accredited by the Department of Justice may lawfully give you legal advice or represent you before USCIS or immigration court. A "notario," visa consultant, or unlicensed preparer who promises to guarantee a waiver or medical exam outcome is a red flag - verify any representative through EOIR at justice.gov/eoir before paying anyone.
This article is general legal information, not legal advice, and does not create an attorney-client relationship. Consult a qualified immigration attorney or DOJ-accredited representative about your specific situation.
Frequently asked questions
Will a missing vaccination alone get my green card denied?
Not necessarily. If you lack a required vaccine, the civil surgeon can usually administer it during the exam, or certify that it isn't medically appropriate for you. A denial on this ground generally only happens if the gap isn't resolved and no waiver applies.
Can I refuse vaccines for religious reasons and still qualify?
You may apply for a waiver based on religious belief or moral conviction, but USCIS requires the objection to be sincere, longstanding, and to cover vaccination in general - not just one vaccine you dislike. This waiver is filed on Form I-601 and is a discretionary decision, not automatic.
Does having a past mental health diagnosis automatically make me inadmissible?
No. This ground requires both a current or past physical/mental disorder and associated harmful behavior connected to it. A diagnosis alone, with no harmful behavior, does not trigger this ground.
Is there a waiver if I'm currently struggling with drug addiction?
No waiver exists for current drug abuse or addiction under this ground. USCIS instead looks at whether the condition is in remission; if it's current, the case generally cannot go forward until that changes.
Who actually decides if I'm inadmissible on medical grounds?
The civil surgeon (for cases inside the U.S.) or panel physician (for consular cases abroad) documents the medical findings, but USCIS or the consular officer makes the final inadmissibility determination based on that report.
This article is general legal information, not legal advice, and may not reflect the most current law or the law in your jurisdiction. Laws vary by state and change over time. For advice about your specific situation, consult a licensed attorney.
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