Immigration Medical Examination And Admissibility Conditions
US Immigration laws stipulate that a medical physical exam is required for all immigration visas and even for some non immigration visas. Refugees and applicants who have filed for adjustment status also need to go set for the immigration medical exam, which is also called the Green Card Physical Examination. The main reason behind administering the Green Card Physical is to explore likelihood of any health conditions that could prevent the applicant from immigrating.
WHAT COULD MAKE AN APPLICANT INELIGIBLE FOR ADMISSIBILITY
USCIS-approved Civil Surgeons are specially designated and may administer the examination inside the country. Panel Physicians can run the exam outside of the country.
All medical conditions, according to CDC norms are classified into Class A and Class B categories.
If medical ailments of the applicant fall under Class A then your applicant cannot gain admission into the country.
4 conditions that could make the applicant inadmissible based on medical health are:

Those who have any type of communicable disease that could cause concern to public health like: chancroid, gonorrhea, HIV/AIDS, leprosy (infectious), infectious syphilis, infectious TB (Class A TB) and any communicable disease of public significance.
Those applicants who have to use for immigrant visas or apply for adjustment of status but haven't received all the vaccinations as mandated by CDC.
Those individuals who display physical or mental anomalies, these disorders may be connected with harmful behavior. There could be physical or mental disorders which could have existed in the past though these disorders are not current in today's they are more likely to recur in the future and might even result in harmful behavior. Such conditions could lead to the visa being refused.
DOT physical renewal who are found to be abusers of drugs. Drug addicts too could are categorized as the scanner.
All other medical ailments are categorized as Class B. Medical ailments falling under Class B also involve physical and mental conditions, certain diseases and other disabilities of serious or permanent nature. Class B category diseases could entertain waivers that may be applied for by applicants.
RELAX BEFORE THE IMMIGRATION EXAMINATION