AD

1. HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating physician supervision for more than four concurrent anesthesia procedures. Use of this modifier affects Medicare payment. 2. Abbreviation for administrative director. See administrative director (AD).

Add-on code

Procedural code in the CPT book that is preceded with a plus (+) symbol indicating the code may be reported in addition to the parent or primary procedure code number (see Box A-1 ). Add-on codes are never reported for stand-alone services but are reported secondarily in addition to the primary procedure.Box A-1ADD-ON CODEParent code 11000Biopsy of skin … single lesion each separate/additional lesion (list separately in addition to code for primary procedure)Add-on code +11101

Added years

The years added to the ‘actual membership years’ to enhance the benefits for the member of a defined benefit scheme. It may be the outcome of a transfer payment received by the pension scheme, an additional voluntary contribution, or the employer or the scheme improving the member’s benefits.