D.C. Mun. Regs. tit. 6, r. 6-B1152
A claim for the payment of compensation under this chapter must be filed in writing with the pay authority within three (3) years from the date it first accrued or the claim shall be forever barred.
The date of accrual of a claim under § 1152.1 shall be the first day the services were performed or the date other compensation under this chapter was due.
Upon receipt of a claim, the pay authority shall investigate the claim, and shall respond in writing to the claimant within ninety (90) days of receipt of the claim.
The pay authority shall either grant or deny the pay claim in writing. The failure of the pay authority to issue a written decision within the time specified in Subsection 1152.3 shall toll the three (3) year limitation established in Subsection 1152.1.
A written decision by the pay authority either granting or denying a pay claim shall constitute the final decision on the claim and shall not be grievable or subject to further administrative review.
D.C. Mun. Regs. tit. 6, r. 6-B1152