USCIS Technical Instructions divide immigration medical findings into Class A (inadmissible) and Class B (admissible with notation). Understanding the difference helps you know what to expect.
Class A conditions
- Communicable diseases of public health significance (active TB, syphilis, leprosy, gonorrhea — historically also HIV until 2010)
- Mental disorders with associated harmful behavior
- Drug abuse or drug addiction
- Lacking required vaccinations without a valid waiver
Class B conditions
- Latent TB infection (positive IGRA, negative chest X-ray)
- Past mental disorder without current harmful behavior
- Other significant medical conditions (cardiovascular, diabetes, etc.) noted for the record
What this means for your case
Class A = inadmissible until resolved or waived. Class B = your case proceeds normally but USCIS knows about the condition. Most chronic conditions (diabetes, hypertension, asthma) are not Class A.
If you have questions about how a specific condition might be classified, that’s worth raising when you schedule your I-693 exam.