Indiana Code Title 5. State and Local Administration § 5-10.3-8-5

Sec. 5. A member may petition the board to correct an error in the determination of the member's:

at any time.  The petition must contain the necessary information to sustain the member's claim of error.  The board shall investigate the claim and, if error is found, shall order the member's records corrected.  If no error is found and the member petitioned the board to correct the error within six (6) years after the determination of the member's creditable service or benefit, the member may appeal the board's decision under IC 4-21.5.