Chapter 2 - Medical Examination and Vaccination Record
The results of the medical examination and vaccination record determine whether an applicant is inadmissible on health-related grounds. The medical examination documentation indicates whether the applicant has either a Class A or Class B medical condition and the vaccination record shows whether the applicant has complied with all vaccination requirements.
Class A and B conditions are defined in Department of Health and Human Services (HHS)regulations. 
Class A conditions are medical conditions that render a person inadmissible and ineligible for a visa or adjustment of status.  A Class A medical condition is a:
Communicable disease of public health significance per HHS regulation;
A failure to present documentation of having received vaccinations against vaccine-preventable diseases; 
Present or past physical or mental disorder with associated harmful behavior or harmful behavior that is likely to recur; and
Drug abuse or addiction.
Class B conditions are defined as physical or mental health conditions, diseases, or disability serious in degree or permanent in nature.  This may be a medical condition that, although not rendering an applicant inadmissible, represents a departure from normal health or well-being that may be significant enough to:
Interfere with the applicant’s ability to care for himself or herself, to attend school, or to work; or
Require extensive medical treatment or institutionalization in the future.
When a medical examination is required to determine the applicant’s admissibility, the person must be examined by a physician who is designated to perform this examination.
By statute, any medical officer in the U.S. Public Health Service may conduct the examination. However, this rarely occurs. Most medical examinations are conducted by a physician designated as a civil surgeon by USCIS  or designated as a panel physician abroad by the U.S. Department of State (DOS). Civil surgeons complete medical examinations for applicants in the United States, while panel physicians complete medical examinations for immigrant visa and refugee applicants seeking immigration benefits from outside the United States.
[^ 3] This Class A medical condition only applies to aliens who seek admission as immigrants, or who seek adjustment of status to one lawfully admitted for permanent residence. Additionally, a child who is adopted and under the age of 10 years or younger is not deemed to have a Class A condition if the following conditions apply: Prior to the admission of the child, an adoptive parent or prospective adoptive parent of the child, who has sponsored the child for admission as an immediate relative, has executed an affidavit stating that the parent is aware of the vaccination requirement , and will ensure that, within 30 days of the child’s admission, or at the earliest time that is medically appropriate, the child will receive the vaccinations required for immigration purposes. See 42 CFR 34.2(d)(2).
No appendices available at this time.
U.S. Citizenship and Immigration Services (USCIS) is updating and incorporating relevant Adjudicator’s Field Manual (AFM) content into the USCIS Policy Manual. As that process is ongoing, USCIS has moved any remaining AFM content to its corresponding USCIS Policy Manual Part, in PDF format, until relevant AFM content has been properly incorporated into the USCIS Policy Manual. To the extent that a provision in the USCIS Policy Manual conflicts with remaining AFM content or Policy Memoranda, the updated information in the USCIS Policy Manual prevails. To find remaining AFM content, see the crosswalk (PDF, 327.05 KB) between the AFM and the Policy Manual.
This technical update replaces all instances of the term “foreign national” with “alien” throughout the Policy Manual as used to refer to a person who meets the definition provided in INA 101(a)(3) [“any person not a citizen or national of the United States”].
U.S. Citizenship and Immigration Services (USCIS) is updating policy guidance in Volume 8, Part B of the USCIS Policy Manual regarding the period of time during which a Form I-693 submitted in support of a related immigration benefits application is considered valid.
U.S. Citizenship and Immigration Services (USCIS) is updating guidance regarding health-related grounds of inadmissibility in accordance with the U.S. Department of Health and Human Services (HHS) rulemaking updating Title 42 of the Code of Federal Regulations, part 34 (42 CFR 34).
U.S. Citizenship and Immigration Services (USCIS) is issuing guidance in the USCIS Policy Manual on the health-related grounds of inadmissibility under INA 212(a)(1) and corresponding waivers under INA 212(g).