NCCI Edit Checker: Procedure Bundling & Mutually Exclusive Code Lookup

Check Medicare National Correct Coding Initiative (NCCI) Procedure-to-Procedure (PTP) edits between any two medical procedure codes. Determine modifier indicator eligibility (0, 1, or 9) and check Medically Unlikely Edit (MUE) daily unit ceilings.

Quick Test Scenarios:

NCCI PTP Bundling Result

Edit Detected: 99213 vs. 96372

Modifier Indicator 1: Modifier Allowed With Documentation

CMS Policy Rationale:

Therapeutic injection administered during E/M encounter. Allowed with Modifier 25 when significant and separately identifiable.

Primary Code (Column 1): 99213

Bundled Code (Column 2): 96372

Effective Date: 2026-10-01

Setting: Practitioner / Non-Facility

Billing Action: An unbundling modifier is permitted if and only if clinical documentation demonstrates the services were distinct, separate encounters, separate anatomical sites, or significant separately identifiable procedures. Apply Modifier 25 (for E/M visits), Modifier 59 (distinct procedural service), or targeted CMS X-modifiers (XE, XP, XS, XU) to Column 2 code 96372.

Medically Unlikely Edit (MUE) Maximum Allowable Daily Units

99213 MUE Limit 1 Units

Edit Type: MAI 1 (Line Edit)

Only one primary established office visit permitted per provider per date of service.

96372 MUE Limit 2 Units

Edit Type: MAI 1 (Line Edit)

Up to 2 distinct therapeutic injections per encounter with appropriate modifier.

Official NCCI Modifier Indicators Explained

Indicator 0 (Not Allowed)

Modifier override is not allowed under any circumstances. If billed together, Column 2 code is completely denied as bundled into Column 1.

Indicator 1 (Allowed With Modifier)

Modifier override is permitted only when medical documentation supports distinct anatomical site, separate encounter, or independent clinical procedure.

Indicator 9 (Deleted / Exempt)

The edit was deleted or made retroactive by CMS. The pair is evaluated under standard coding guidelines without NCCI restrictions.

Choosing Between Modifier 59 and the CMS X-Modifiers

CMS guidelines recommend using more specific HCPCS Level II X-modifiers whenever applicable instead of the generic Modifier 59:

Modifier XE (Separate Encounter): A service that is distinct because it occurred during a separate patient encounter on the same date.
Modifier XS (Separate Structure): A service that is distinct because it was performed on a separate anatomical organ or structure.
Modifier XP (Separate Practitioner): A service that is distinct because it was performed by a different practitioner.
Modifier XU (Unusual Non-Overlapping Service): A service that is distinct because it does not overlap usual components of the main service.