1. See administrative simplification (AS). 2. HCPCS Level II modifier that may be used with CPT or HCPCS Level II codes indicating services of an assistant at surgery. Use of this modifier affects Medicare payment. 3. See assistant surgeon (AS).

Payment received by an ambulatory surgery center (ASC) when a Medicare beneficiary has a covered surgical procedure performed in an ASC. ASC procedures are grouped into eight payment categories.

Operative procedure performed in an ambulatory surgical center (ASC) and done as an outpatient.

Systematic collection and review of data (test results, signs, symptoms) pertaining to an individual for either receiving health care services or to enter a health care setting.

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A value set upon real estate by Government assessors for the purpose of assessing taxes.

Insurance claim form from a provider to the insurance company on which the provider agrees to accept the Medicare allowable amount as payment in full for the services and payment is sent directly to the provider of the service.

State-supervised automobile insurance plan that has been obtained through a proportional assignment from a group of insurance companies because the insured is unable to buy in the regular or voluntary market. Each driver in the plan is assigned to an insurance company. Cost of this insurance is higher than in the regular market.