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C. Carrier Claims Processing System Requirements
10. Rank the surgeries subject to the multiple surgery rules (indicator “2”) in descending order by the Medicare fee schedule amount;
11. Base payment for each ranked procedure (indicator “2”) on the lower of the billed amount:
• 100 percent of the fee schedule amount (Field 34 or 35) for the highest valued procedure; and
• 50 percent of the fee schedule amount for the second through the fifth highest valued procedures; or
12. If more than five procedures with an indicator of “2” are billed, pay for the first five according to the rules listed in 9, 10, and 11 above and suspend the sixth and subsequent procedures for manual review and payment, if appropriate, “by report.” Payment determined on a “by report” basis for these codes should never be lower than 50 percent of the full payment amount. Pay by the unit for services that are already reduced (e.g., 17003). Pay for 17340 only once per session, regardless of how many lesions were destroyed;
NOTE: For dates of service prior to January 1, 1995, the multiple surgery indicator of “2” indicated that special dermatology rules applied. The payment rules for these codes have not changed. The rules were expanded, however, to all codes that previously had a multiple surgery indicator of “1.” For dates of service prior to January 1, 1995, if a dermatological procedure with an indicator of “2” was billed with the “-51” modifier with other procedures that are not dermatological procedures (procedures with an indicator of “1” in Field 21), the standard multiple surgery rules applied. Pay no less than 50 percent for the dermatological procedures with an indicator of “2.” See §§40.6.C.6-8 for required actions.
13. If Field 21 contains an indicator of “3,” and multiple endoscopies are billed, the special rules for multiple endoscopic procedures apply. Pay the full value of the highest valued endoscopy, plus the difference between the next highest and the base endoscopy. Access Field 31A of the MFSDB to determine the base endoscopy.
http://www.cms.gov/manuals/downloads/clm104c12.pdf