AH

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating services performed by a clinical psychologist. Use of this modifier affects Medicare payment.

Airplane insurance

Insurance that is purchased by commercial airlines and consists of property insurance on airplanes and liability insurance for passengers and persons not passengers. It is for negligent acts or omissions by the airline that may result in bodily injuries or property damages.

AJ

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating services performed by a clinical social worker. Use of this modifier affects Medicare payment.

AK

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating services provided by a nonparticipating physician. Use of this modifier affects Medicare payment.

AKS

Abbreviation that may be defined as anti-kickback statute. See Stark I Regulations and Stark II Regulations .