Code of Federal Regulations Title 5. Administrative Personnel § 5.630.1307 Medical certification

(1) A statement by the health care provider that the medical treatment is for one or more service-connected disabilities of the employee that resulted in 30 percent or more disability rating;

(2) The date or dates of treatment or, if the treatment extends over several days, the beginning and ending dates of the treatment;

(3) If the leave was not requested in advance, a statement that the treatment required was of an urgent nature or there were other circumstances that made advanced scheduling not possible;  and

(4) Any additional information that is essential to verify the employee's eligibility.

(c)(1) An employee must provide any required written medical certification no later than 15 calendar days after the date the agency requests such medical certification, except as otherwise allowed under paragraph (c)(2) of this section.

(2) If the agency determines it is not practicable under the particular circumstances for the employee to provide the requested medical certification within 15 calendar days after the date requested by the agency despite the employee's diligent, good faith efforts, the employee must provide the medical certification within a reasonable period of time under the circumstances involved, but no later than 30 calendar days after the date the agency requests such documentation.

(3) An employee who does not provide the required evidence or medical certification within the specified time period is not entitled to use disabled veteran leave, and the agency may, as appropriate and consistent with applicable laws and regulations—