Affiliated contractor (AC)

Medicare carrier, fiscal intermediary (FI), or other contractor such as a durable medical equipment regional carrier (DMERC) that shares some or all of the provider service carrier’s (PSC’s) jurisdiction in which the affiliated contractor performs non-PSC Medicare functions such as claims processing or education.

Affiliation period

Length of time managed care plan members must wait before receiving benefits. It is an alternative to preexisting condition exclusions seen in insurance plans. Under the Health Insurance Portability and Accountability Act (HIPAA), an affiliation period may not last longer than 2 months or, if a late enrollee, 3 months. It begins on the member’s date of enrollment. If a member changes coverage more than 3 months after the enrollment date, the new plan cannot impose an affiliation period.

AG

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