§ 177.109 Final denial of claim.
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
Final denial of an administrative claim must be in writing and sent to the claimant, his or her attorney, or legal representative by certified or registered mail. The notification of final denial may include a statement of the reasons for the denial. But, it must include a statement that, if the claimant is dissatisfied with the OPM action, he or she may file suit in an appropriate United States district court not later than 6 months after the date of mailing of the notification.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.