42 CFR §416.120

1. (a)Hospital outpatient department. Payment is in accordance with part 419 of this chapter.
2. (b)[Reserved]
3. (c)ASC—(1) General rule. Payment is based on a prospectively determined rate. This rate covers the cost of services such as supplies, nursing services, equipment, etc., as specified in § 416.61. The rate does not cover physician services or other medical services covered under part 410 of this chapter (for example, X-ray services or laboratory services) which are not directly related to the performance of the surgical procedures. Those services may be billed separately and paid on a reasonable charge basis.
   1. (2)Single and multiple surgical procedures.
      1. (i)If one covered surgical procedure is furnished to a beneficiary in an operative session, payment is based on the prospectively determined rate for that procedure.
      2. (ii)If more than one surgical procedure is furnished in a single operative session, payment is based on—
         1. (A)The full rate for the procedure with the highest prospectively determined rate; and
         2. (B)One half of the prospectively determined rate for each of the other procedures.
   2. (3)Deductibles and coinsurance. Part B deductible and coinsurance amounts apply as specified in § 410.152 (a) and (i) of this chapter.