5 C.F.R. § 339.303 – Medical examination procedures.

(a) When an agency requires or offers a medical or psychiatric examination or psychological assessment under this subpart, it must inform the applicant or employee in writing of its reasons for doing so, the consequences of failure to cooperate, and the right to submit medical information from his or her private physician or practitioner. A single written notification is sufficient to cover a series of regularly recurring or periodic examinations ordered under this subpart. An agency may establish timeframes, in writing, for submission of medical documentation, with allowances for reasonable extensions.
1. (1) Refusal or failure to report for a medical examination ordered by the agency may be a basis for a determination that the applicant or employee is not qualified for the position. In addition, an employee may be subject to adverse action.
2. (2) Refusal or failure on the part of an applicant or the employee to authorize release of any results from an agency ordered or offered medical examination issued in accordance with §§ 339.301 or 339.302, or the results of any previous medical treatments or evaluations relative to the identified medical issue, to authorized agency representatives, including the agency physician or medical review officer and/or independent medical specialists, may be a basis for disqualification for the position by the hiring agency. In addition, an employee may be subject to adverse action.
(b) The agency designates the examining physician or other appropriate practitioner, but must offer the applicant or employee an opportunity to submit medical documentation from his or her private physician or practitioner for consideration in the medical examination process. The agency must review and consider all such documentation supplied by the private physician or practitioner. The applicant or employee must authorize release of this documentation to all authorized agency representatives. In situations where the medical documentation of the applicant or employee's private physician or practitioner is contradictory and cannot be resolved by the examining physician or the agency physician or medical review officer, the agency may, at its option, pursue another opinion from an appropriate specialist at agency expense. An applicant or employee also may, at his or her option, pursue another opinion from an appropriate specialist at his or her expense in the event of conflicting or contradictory medical documentation.