(a) Causes; service credit

Any participant who has at least 5 years of service credit toward retirement under the System (excluding military and naval service) and who becomes totally disabled or incapacitated for useful and efficient service by reason of disease, illness, or injury (not due to vicious habits, intemperance, or willful conduct of the participant) shall, upon his or her own application or upon order of the Secretary, be retired on an annuity computed as prescribed in section 4046 of this title. If the disabled or incapacitated participant has less than 20 years of service credit toward retirement under the System at the time of retirement, his or her annuity shall be computed on the assumption that the participant has had 20 years of service, except that the additional service credit that may accrue to a participant under this sentence shall in no case exceed the difference between his or her age at the time of retirement and age 60.

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However, if a participant retiring under this section is receiving retired pay or retainer pay for military service (except that specified in section 8332(c)(1) or (2) of title 5) or Department of Veterans Affairs pension or compensation in lieu of such retired or retainer pay, the annuity of that participant shall be computed under this part excluding extra credit authorized by this subsection and excluding credit for military service from that computation. If the amount of the annuity so computed, plus the retired or retainer pay which is received, or which would be received but for the application of the limitation in section 5532 ¹ of title 5 or the Department of Veterans Affairs pension or compensation in lieu of such retired pay or retainer pay, is less than the annuity that would be payable under this part in the absence of the previous sentence, an amount equal to the difference shall be added to the annuity computed under this part.

(b) Physical examination; reinstatement or reappointment upon recovery; fees and expenses; duration and suspension of annuity

Before being retired under this section, the participant shall be given a physical examination by one or more duly qualified physicians or surgeons designated by the Secretary of State to conduct examinations. Disability or incapacity shall be determined by the Secretary of State on the basis of the advice of such physicians or surgeons. Unless the disability or incapacity is permanent, like examinations shall be made annually until the annuitant has attained age 60. If the Secretary of State determines on the basis of the advice of one or more duly qualified physicians or surgeons conducting such examinations that an annuitant has recovered to the extent that he or she can return to duty, the annuitant may apply for reinstatement or reappointment in the Service within 1 year from the date recovery is determined. Upon application, the Secretary shall reinstate such recovered annuitant in the class in which the annuitant was serving at time of retirement, or the Secretary may, taking into consideration the age, qualifications, and experience of such annuitant, and the present class of his or her contemporaries in the Service, appoint or recommend that the President appoint the annuitant to a higher class. Payment of the annuity shall continue until a date 6 months after the date of the examination showing recovery or until the date of reinstatement or reappointment in the Service, whichever is earlier. Fees for examinations under this section, together with reasonable traveling and other expenses incurred in order to submit to examination, shall be paid out of the Fund. If the annuitant fails to submit to examination as required under this subsection, payment of the annuity shall be suspended until continuance of the disability or incapacity is satisfactorily established.

(c) Benefits upon discontinuance of annuity

If a recovered annuitant whose annuity is discontinued is for any reason not reinstated or reappointed in the Service, he or she shall be considered to have been separated within the meaning of section 4050 of this title as of the date of retirement for disability or incapacity and shall, after the discontinuance of the annuity, be entitled to the benefits of that section or of section 4055 of this title, except that he or she may elect voluntary retirement if eligible under section 4051 of this title.

(d) Election of benefits; concurrent benefits allowed

No participant shall be entitled to receive an annuity under this part and compensation for injury or disability to himself or herself under subchapter I of chapter 81 of title 5, covering the same period of time, except that a participant may simultaneously receive both an annuity under this section and scheduled disability payments under section 8107 of title 5. This subsection shall not bar the right of any claimant to the greater benefit conferred by either this part or subchapter I of such chapter 8 ² for any part of the same period of time. Neither this subsection nor any provision of subchapter I of such chapter 8 ² shall be construed to deny the right of any participant to receive an annuity under this part and to receive concurrently any payment under subchapter I of such chapter 8 ² by reason of the death of any other individual.

(e) Lump sum disability payments

Notwithstanding any other law, the right of any individual entitled to an annuity under this part shall not be affected because such person has received an award of compensation in a lump sum under section 8135 of title 5, except that where such annuity is payable on account of the same disability for which compensation under such section has been paid, so much of such compensation as has been paid for any period extended beyond the date such annuity becomes effective, as determined by the Secretary of Labor, shall be refunded to the Department of Labor, to be paid into the Federal Employees’ Compensation Fund. Before such individual receives such annuity, he or she shall—

(1) refund to the Department of Labor the amount representing such commuted payments for such extended period, or

(2) authorize the deduction of such amount from the annuity payable under this part, which amount shall be transmitted to the Department of Labor for reimbursement to such Fund.

Deductions from such annuity may be made from accrued and accruing payments, or may be prorated against and paid from accruing payments in such manner as the Secretary of Labor shall determine, whenever the Secretary of Labor finds that the financial circumstances of the annuitant warrant deferred refunding.

(f) Time of filing application; waiver

A claim may be allowed under this section only if the application is filed with the Secretary of State before the participant is separated from the Service or within one year thereafter. This time limitation may be waived by the Secretary of State for a participant who at the date of separation from the Service or within one year thereafter is mentally incompetent, if the application is filed with the Secretary of State within one year from the date of restoration of the participant to competency or the appointment of a fiduciary, whichever is earlier.