Coding Rules/Advanced/28 minutes/Reviewed 2026-07-10

NCCI Procedure-to-Procedure Edits

Read Column One, Column Two, and modifier indicators before deciding whether services may be reported together.

Quick answer

A Medicare NCCI PTP edit identifies code pairs that generally should not be paid together for the same beneficiary and date. The Column Two code denies unless the edit permits a modifier and the clinical facts support a valid exception.

Rules to know

Use the edit file effective for the date of service.
Modifier indicator 1 does not mean a modifier is automatically appropriate.
Modifier indicator 0 means the edit is not bypassed with an NCCI-associated modifier.
NCCI files do not establish benefit coverage.

Operational workflow

01Identify claim setting and date of service.
02Check the current practitioner or outpatient hospital PTP file.
03Read the code pair and modifier indicator.
04Compare the record to NCCI policy-manual rationale.
05Use a modifier only when a documented distinct circumstance exists.

How to read a PTP table

A PTP result is a coding relationship, not a coverage determination. Research the file for the correct quarter and setting, then compare the actual record to the NCCI policy rationale.

Field	Meaning	Decision
Column One	The code generally eligible for payment when the edit applies	Do not assume it is covered or correctly coded merely because it appears here.
Column Two	The code generally denied as part of the Column One service	Check whether the services were truly distinct under the policy rationale.
Modifier indicator 0	NCCI-associated modifiers do not bypass the edit	Do not append 59 or an X modifier to force payment.
Modifier indicator 1	A modifier may be allowed when documented circumstances support it	Select the most specific valid modifier; the indicator does not itself justify one.
Modifier indicator 9	The edit is not active for the relevant period shown by the file	Verify effective and deletion dates and other payer edits.

Common failure modes

Appending modifier 59 only because Column Two denied.
Using the wrong quarter or claim-setting file.
Assuming separate claim lines prove separate services.

Knowledge check

What does modifier indicator 1 establish?

The claim will payA modifier may bypass the edit when facts support itBoth services are always coveredThe code pair is obsolete

Official sources

Medicare NCCI Procedure-to-Procedure EditsCenters for Medicare & Medicaid ServicesReviewed 2026-07-10 National Correct Coding Initiative for MedicareCenters for Medicare & Medicaid ServicesReviewed 2026-07-10 Medicare NCCI FAQ LibraryCenters for Medicare & Medicaid ServicesReviewed 2026-07-10

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AdvancedMedically Unlikely Edits and Units of Service AdvancedModifier 59 and XE, XP, XS, XU

Education only. Verify the current code set, payer contract, coverage policy, implementation guide, and claim-specific facts. Do not enter protected health information into this site.