AW

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating item(s) used with a surgical dressing.

AX

HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating item(s) used with dialysis services.B

BA

1. See business associate (BA) . 2. HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating item(s) used with parenteral enteral nutrition (PEN) services.

Back date

Issuance of an insurance policy for an individual or a group that is effective on a month, day, and year earlier than the date of actual issue so that the premium rate will be lower. State law usually limits backdating to not more than 6 months. Also called dating back .