As used in this part:

Agency means the Office of Personnel Management (OPM).

CSRS means the Civil Service Retirement System as described in subchapter III of chapter 83 of title 5, United States Code.

FERS means the Federal Employees' Retirement System as described in chapter 84 of title 5, United States Code.

Misuse of benefits means the embezzlement or conversion of all or any part of the amount received by the representative payee for a use other than for the use and benefit of the minor or individual on whose behalf such payments were received.

Physician and practitioner have the same meaning given these terms in § 339.104 of this chapter.

Representative payee means a person, who is at least 18 years of age, or an organization designated to receive annuity payments on behalf of a minor or an individual mentally incompetent or under other legal disability.