As I understand it, "A Civil surgeon is a doctor, selected by the USCIS to
conduct medical examinations of aliens in the United States who are applying
for adjustment of status to permanent residence, or who are required by the USCIS to have
a medical examination."
You may use your HSA for "Qualified medical expenses are those expenses
that generally would qualify for the medical and dental expenses deduction.
These are explained in Pub. 502, Medical and Dental Expenses. " - IRS
Publication 969
The IRS says about qualified medical expenses: "Medical care expenses
must be primarily to alleviate or prevent a physical or mental defect or
illness. They don't include expenses that are merely beneficial to general
health, such as vitamins or a vacation." IRS
Publication 502.
Since the civil surgeon is, in fact, a doctor, and since the
exam appears to be to prevent a "physical or mental defect or
illness", the expense would seem to be a qualified medical expense for an
HSA distribution.