If you are applying for a U.S. immigrant visa or adjusting status, the medical examination is one of the most anxiety-inducing steps — especially when the civil surgeon mentions a "Class A" or "Class B" medical condition. These classifications are not arbitrary; they are based on the Centers for Disease Control and Prevention (CDC) Technical Instructions and directly affect your eligibility for admission into the United States. A Class A condition renders an applicant inadmissible and requires a waiver, while a Class B condition is a non‑disqualifying physical or mental abnormality that does not bar entry but must be documented for follow‑up. Misunderstanding the difference — or failing to provide the correct supporting documentation — leads to thousands of visa denials and costly waiver applications every year.
Critical Rule: A Class A condition is a communicable disease of public health significance (such as tuberculosis, syphilis, or gonorrhea) or a physical/mental disorder with harmful behavior that makes an applicant inadmissible. A Class B condition is any other abnormality, disease, or disability that is not disqualifying but requires medical monitoring or treatment. The civil surgeon or panel physician assigns the classification on the Form I‑693 or DS‑2053, and that determination is final unless you provide compelling counter‑evidence. As of August 2026, the CDC continues to strictly enforce the classification criteria, with no exceptions for incomplete documentation.
What Exactly Is a Class A vs Class B Medical Condition?
The distinction between Class A and Class B is rooted in public health risk and the potential for harm to the U.S. public or the applicant themselves. The civil surgeon evaluates each applicant against a standardized checklist of conditions.
- Class A (Inadmissible) conditions include:
- Communicable diseases of public health significance — active tuberculosis (TB), infectious syphilis, gonorrhea, chancroid, and leprosy (infectious). COVID‑19 is no longer on the list, but other respiratory diseases may be added as the CDC updates its guidance.
- Physical or mental disorders with associated harmful behavior — a history of drug or alcohol abuse with current harmful behavior, or a mental disorder that presents a threat to property, safety, or the welfare of others.
- Substance abuse or addiction — current, active illicit drug use or dependence.
- Class B (Non‑inadmissible) conditions include:
- Inactive or latent tuberculosis — positive IGRA (blood test) or PPD skin test with no active chest X‑ray findings.
- Chronic diseases — diabetes, hypertension, heart disease, cancer (in remission), HIV (unless active AIDS), and autoimmune disorders that are managed and do not pose a public health threat.
- Corrected or stable mental health conditions — anxiety, depression, or PTSD that does not involve harmful behavior.
- Physical impairments — missing limbs, vision or hearing loss, or mobility issues that do not affect the ability to work or care for oneself.
The civil surgeon must classify every condition found during the exam — even if it is minor. A Class B designation simply means the condition is noted on your medical record, but it will not prevent you from receiving a visa.
⚠️ Important: The classification is based on the current clinical presentation — not past diagnoses. For example, if you were treated for TB ten years ago and now have a negative chest X‑ray, you will likely receive a Class B designation (inactive TB) rather than a Class A. Always bring your complete treatment records to the exam to prove that the condition is resolved or controlled.
Eligibility and Waiver Options for Each Classification
If you receive a Class A classification, you are not automatically barred forever — but you must apply for a waiver of inadmissibility. The waiver process is distinct for Class A conditions, while Class B conditions require no waiver.
| Classification | Visa Impact | Waiver Required? |
|---|---|---|
| Class A (Communicable Disease) | Inadmissible — visa denied unless waiver granted | Yes — Form I‑601 (or I‑601A for provisional) required |
| Class A (Substance Abuse) | Inadmissible — visa denied unless waiver granted | Yes — requires evidence of rehabilitation and lack of recidivism |
| Class A (Mental/Physical with Harmful Behavior) | Inadmissible — visa denied unless waiver granted | Yes — requires psychiatric evaluation and risk assessment |
| Class B (Any non‑disqualifying condition) | Admissible — no visa impact, but USCIS notes the condition | No — waiver is not required |
For Class A waivers, you must demonstrate that: (1) the condition has been cured or is under effective treatment, (2) you are not a threat to public health, and (3) the denial of your visa would cause extreme hardship to your U.S. citizen or lawful permanent resident spouse, parent, or child. Waiver processing takes 6 to 18 months, so early preparation is critical.
✅ Pro Tip: If you have a condition that could be classified as Class A, do not wait for the civil surgeon to make the determination. Obtain a specialist's report — including a letter stating that you have completed treatment and are no longer contagious — and present it to the panel physician on the day of your exam. This evidence can help the physician assign a Class B classification instead, saving you months of waiver processing.
Step‑by‑Step Medical Examination Process and How the Classification Is Determined
The classification is not arbitrary; it follows a strict clinical workflow. Understanding this process helps you anticipate the outcome and prepare the right documentation.
- Complete the medical history questionnaire: You will fill out a detailed form listing all past and present illnesses, surgeries, hospitalizations, and psychiatric treatments. Be thorough — omissions can be interpreted as fraud and lead to a permanent inadmissibility finding.
- Physical examination: The civil surgeon performs a full physical, checking for signs of communicable diseases, neurological deficits, and physical abnormalities.
- Laboratory and screening tests: You will undergo a blood test (for syphilis, HIV, and other conditions) and a chest X‑ray (for TB). The results of these tests drive most Class A classifications. A positive IGRA or PPD without an active chest X‑ray usually results in a Class B designation; a positive X‑ray or culture results in a Class A designation.
- Mental health evaluation: If you disclose a history of mental illness or substance abuse, or if the physician suspects a problem, you may be referred to a psychiatrist. The psychiatrist evaluates whether you pose a risk of harmful behavior — a finding of risk triggers a Class A classification.
- Classification assignment: The physician reviews all results and assigns a classification for each condition. The findings are recorded on the Form I‑693 (for adjustment of status) or DS‑2053 (for consular processing). The physician then seals the envelope — you are not permitted to open it.
If you disagree with the classification, you have the right to request a second medical opinion or to submit additional evidence to the civil surgeon within 30 days of the exam. However, the final decision rests with the surgeon.
Common Misunderstandings That Lead to Visa Denials
Applicants and even some attorneys make frequent errors when interpreting or responding to Class A vs Class B classifications. These mistakes are entirely avoidable with the right knowledge.
- Assuming Class B conditions are irrelevant: While Class B conditions do not bar admission, they can affect your ability to obtain a visa if they indicate a need for public care. If the physician notes a condition that could make you a "public charge," USCIS may deny your visa on that basis. Always provide evidence of health insurance or private financial support for any serious Class B condition.
- Failing to bring treatment records for past Class A conditions: If you had a communicable disease in the past and were treated, you must bring the complete treatment record — including dates of medication, lab results, and a cure certificate. Without this, the civil surgeon must treat you as if you still have the active disease, resulting in a Class A classification and a mandatory waiver application.
- Self‑treating or hiding substance use: Substance abuse is a Class A condition if it is current. Hiding a history of drug use is worse than disclosing it — if the civil surgeon discovers it through the physical exam or toxicology screening, you will be classified as Class A with an additional finding of fraud.
- Not translating medical records properly: If your treatment records are in a foreign language, you must provide a certified translation. The civil surgeon cannot accept untranslated records, and without them, the condition will be classified in the worst‑case scenario.
- Missing the vaccination requirements: While not a Class A vs Class B issue, failing to provide vaccination records can lead to a "Class A" designation for vaccine‑preventable diseases if the civil surgeon cannot prove immunity. This makes you inadmissible and forces you to get all missing vaccines before the exam is completed.
Translation and Documentation Requirements for Medical Records
If you have medical records from outside the United States that document a past or current condition, you must present them to the civil surgeon. These records must meet strict authentication and translation standards to influence the classification decision.
- Certified translation: Every document that is not in English must be accompanied by a certified translation. The translation must include the translator's certification statement, signature, and contact information.
- Legible copies: The records must be clear and readable. Faded, damaged, or otherwise illegible records will be disregarded, and the civil surgeon will treat the condition as unsubstantiated.
- Treatment completion letters: For Class A conditions like TB or syphilis, a letter from your treating physician stating the exact dates of treatment, the medication regimen, and the final test results is essential. This letter should be signed and stamped on official clinic letterhead.
- Specialist reports: For mental health conditions, a board‑certified psychiatrist's report that assesses your current risk of harmful behavior can be the difference between a Class A and a Class B classification.
Present these documents to the civil surgeon before the examination begins. Once the classification is assigned and the envelope is sealed, you cannot add new documents to the record.
Frequently Asked Questions
Q: Can a Class A medical condition be changed to Class B after the civil surgeon assigns it?
A: Yes — but only if you provide new, convincing evidence (e.g., a negative follow‑up test or a specialist report showing that the condition is resolved) to the civil surgeon before the Form I‑693 or DS‑2053 is finalized. Once the envelope is sealed, the classification is considered final, and you must apply for a waiver instead.
Q: What happens if I am assigned a Class A condition but I already have a visa interview scheduled?
A: The consular officer will not issue the visa until the Class A condition is resolved. You may be given a medical hold and instructed to obtain additional testing or submit a waiver application. Your interview will be postponed until the issue is cleared, which can take several months to over a year.
Q: Is HIV considered a Class A or Class B condition?
A: As of 2026, HIV is no longer classified as a Class A communicable disease of public health significance. It is treated as a Class B condition — the physician will note it, but it does not make you inadmissible. You will need to provide a treatment plan and evidence that you can manage the condition, but a waiver is no longer required for HIV alone.
Q: Do I need to disclose a Class B condition on my visa application forms?
A: Yes — you must answer all medical history questions on the DS‑160 or DS‑260 truthfully. The consular officer will compare your answers to the civil surgeon's findings. Failure to disclose a known condition — even a Class B one — can be considered misrepresentation and lead to a permanent bar under INA 212(a)(6)(C).
Q: Can I appeal a Class A classification?
A: There is no formal administrative appeal for a civil surgeon's classification. However, you can request a second medical examination at your own expense, or you can submit a written rebuttal with supporting expert opinions to the consular officer or USCIS officer. The final decision on admissibility rests with the immigration officer, not the civil surgeon.
Q: Does a Class B condition affect my ability to become a U.S. citizen later?
A: No — a Class B condition does not impact naturalization (citizenship) unless it indicates that you are likely to become a public charge. As long as you are self‑sufficient or have a valid affidavit of support, a Class B condition is not a barrier to citizenship.