NCCI Code Pair Checker
Enter two CPT or HCPCS codes to check if they form an NCCI edit pair. If they do, billing them together on the same claim is a bundling violation.
Try these common edit pairs
Click any pair below to auto-fill the checker:
What are NCCI edits?
The National Correct Coding Initiative (NCCI) is maintained by the Centers for Medicare & Medicaid Services (CMS). It defines pairs of CPT/HCPCS codes that should not be billed together on the same claim for the same patient on the same date of service.
These are called Procedure-to-Procedure (PTP) edits. In each pair, one code is the "comprehensive" procedure and the other is the "component." The component code is already included in the comprehensive code — billing both is double-charging.
Modifier indicators
Some NCCI edit pairs have a modifier indicator that determines whether modifier 59 (or X{EPSU} modifiers) can override the edit:
- Indicator 0 (Not allowed): The codes are mutually exclusive. Modifier 59 cannot bypass the edit under any circumstances.
- Indicator 1 (Allowed): Modifier 59 may bypass the edit if the services were performed at truly distinct anatomical sites or during separate encounters, with documentation.
Why this matters for your bill
NCCI bundling violations are one of the most common medical billing errors. When a provider bills two codes that form an NCCI edit pair, you're being charged separately for something that should be included in the primary procedure. This can add $50 to $500+ to your bill unnecessarily.
Check your entire bill at once
The NCCI checker tests one pair at a time. Upload your full bill to BillError and we'll check every code combination against 550+ edit pairs, plus 13 other billing rules.
Scan your bill freeAbout our data
This tool checks against 550 NCCI PTP edit pairs loaded from CMS quarterly data releases. CMS updates these edits four times per year. While our curated dataset covers the most commonly encountered edit pairs, the full CMS dataset contains approximately 190,000 pairs.
For comprehensive bill analysis covering all 190K+ pairs plus duplicate detection, upcoding analysis, Medicare rate comparison, and more, use the full BillError scanner.