Before we make a determination that a claimant is not disabled, we will make every reasonable effort to develop the claimant’s complete medical history. Complete medical history means the records of the claimant’s medical sources covering at least the 12 months prior to whichever date is earliest:
The protective filing date (PFD).
The date last insured (DLI) (disability insurance benefits case).
The prescribed period (PP) ending date (disabled widow(er) benefits case).
The attainment of age 22 (childhood disability benefits case).
If the claimant alleges that his or her disability began less than 12 months before the month of filing, PFD, DLI, end of the PP, or attainment of age 22, we will develop a complete medical history beginning with the alleged onset date, unless there is reason to believe that the disability began earlier.
For information on when to develop outside the 12-month period, see DI 22505.006A.2.