NCCI Bilateral Procedure Reporting Rules
Medicare's policy for reporting bilateral procedures uses the MPFS Bilateral Indicator (0, 1, 2, 3, 9) and depends on whether the code descriptor already includes both sides.
Primary source
CMS Medicare Claims Processing Manual Ch. 12 §40.7 (Bilateral) →https://www.cms.gov/regulations-and-guidance/guidance/manuals/downloads/clm104c12.pdf
Verified May 23, 2026 · This is the authoritative regulator URL. The summary below is a research aid; the linked source controls.
Bilateral procedure reporting is governed by the Bilateral Indicator field on the Medicare Physician Fee Schedule Relative Value File and policy in the Medicare Claims Processing Manual Chapter 12 §40.7.
Bilateral Indicator values:
- 0: 150% payment adjustment does not apply (typically because the code descriptor specifies a unilateral procedure where bilateral is reported as two services, or the code descriptor is inherently bilateral).
- 1: 150% payment adjustment applies when modifier 50 is reported (or the procedure is reported with RT and LT or units of 2). Report as a single line with modifier 50.
- 2: 150% payment adjustment does not apply (typically because the descriptor is already bilateral or because anatomically bilateral reporting is not appropriate).
- 3: payment is at full rate per side (radiology and similar — services that are intentionally per-side).
- 9: the concept does not apply (typically because no payment is made through the Physician Fee Schedule).
Reporting format varies by MAC: most MACs accept modifier 50 with units 1 and full charge; some require RT/LT lines. Confirm local MAC policy. Misreporting bilateral as two units rather than modifier 50 is a frequent overpayment driver.
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Related across the archive
- RegulationNCCI Chapter 11: Evaluation and Management ServicesNCCI policy on bundling and separately reporting E/M services with procedures, including modifier 25 use and global surgical package interactions.
- RegulationNCCI Modifier Overrides (Modifier 59 and X{EPSU})Modifier 59 (and its more specific subsets XE, XS, XP, XU) is the principal mechanism for overriding a PTP edit when a procedure is distinct or independent from another performed on the same day.
- RegulationNCCI Policy Manual OverviewThe National Correct Coding Initiative is the CMS coding edits program that prevents improper Medicare payment due to incorrect code reporting; the Policy Manual is the authoritative coding-policy reference.
- RegulationMLN: High-Frequency Medicare Modifier ReferenceReference to the modifiers most commonly used in Medicare professional billing: 25, 26, 50, 51, 57, 58, 59, 76, 77, 78, 79, 80, 82, and the X{EPSU} series.
- RegulationMLN: Split (or Shared) E/M VisitsReference to the Medicare rules for E/M services furnished jointly by a physician and an NPP in a facility setting, with the substantive-portion rule determining who reports.
- RegulationModifier 25: Significant, Separately Identifiable E/M ServiceModifier 25 is appended to an E/M code when the E/M is significant and separately identifiable from another procedure or service performed on the same day by the same provider.
- RegulationNCCI Global Surgical Package PolicyMedicare's global surgical package bundles preoperative, intraoperative, and routine postoperative care into a single payment for the surgical CPT code, with global periods of 0, 10, or 90 days.
- RegulationNCCI Medically Unlikely Edits (MUEs)MUEs are maximum units of service that a single provider would reasonably report on a single date for a single beneficiary, with three adjudication levels (line, date, claim).
Last reviewed May 23, 2026 · Citation verified May 23, 2026
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