The applicable mfb at cessation date.

For a disability benefit, or any benefit prior to January 1996, the mfb is simply the one at the date of cessation of the prior disability benefit. For old-age or survivors in 1996 or later, if the prior mfb was based on the Disability Maximum, the pia at cessation must be deconverted back to eligibility, then that is used to compute a raw mfb, and that is converted forward to the cessation date. 

Also sets rawPia and rawMfb, if the deconversion is necessary.

DibGuar Methods