NCCI Edits

National Correct Coding Initiative (NCCI) edits are pairs of HCPCS/CPT codes that Medicare considers mutually exclusive or that represent services included within another procedure. When two codes are linked by an NCCI edit, they generally cannot be billed together on the same claim for the same patient on the same date of service.

CMS introduced NCCI to promote correct coding practices and prevent improper payments. Each edit designates one code as Column 1 (the comprehensive code) and one as Column 2 (the component code). The claim system automatically denies Column 2 when billed with Column 1, unless a valid modifier overrides the edit. Billers who submit both codes without understanding the edit relationship face denials, recoupments, and potential compliance exposure.

Modifier Indicator

Each NCCI edit has a modifier indicator that controls whether a modifier can bypass the edit:

0 — Modifier cannot bypass edit

The two codes can never be billed together regardless of modifier usage.

1 — Modifier may bypass edit

A modifier (such as 59, XE, XS, XP, XU) may be appended to the Column 2 code if the service was distinct and separate. Documentation must support this.

9 — Not applicable

The edit concept does not apply to this code pair.

How to Check NCCI Edits

On any individual HCPCS code page, the NCCI Edits section lists all codes that cannot be billed alongside that code (Column 2 codes). The modifier indicator shows whether a modifier can be used to bypass the edit.