CurrentBlue KCPolicy POL-PP-226

NCCI Edits (National Correct Coding Initiative) and Modifier Use

Defines Blue KC's expectations for applying NCCI procedure-to-procedure (PTP), medically unlikely edits (MUE), and add-on code edits, including allowed modifiers and documentation requirements; applies to claims submitted to Blue KC across all lines of business and provider types.

Policy Summary

PayerBlue KC

PolicyNCCI Edits (National Correct Coding Initiative) and Modifier Use

Policy CodePolicy POL-PP-226

Change TypeClarifications and additions to add-on enforcement and modifier guidance

Effective DateFeb 15, 2022

Next Review Date

Key ActionDocument medical justification when using NCCI-designated modifiers (e.g., 59 or -X{EPSU}) to override PTP edits; ensure primary/add-on codes are billed per policy or document exceptions.

SourceLink

POLICY UPDATE CHANGES

Blue KC enforces Type I add-on code edits but does not currently enforce Type II or III add-on code requirements.

Primary and add-on codes must be billed on the same day by the same provider, with a stated exception for initial drug administration per vascular access site during observation stays.

Link/reference to separate Blue KC MUE policy (POL-PP246) was added.

Additional anatomical and global modifiers that may override an NCCI conflict were added to the list of allowed modifiers.

Type I enforcedAdd-on code enforcement stance

All linesScope of policy

2022-02-15Policy effective date

2025-02-01

Policy Summary

PayerBlue KC

PolicyNCCI Edits (National Correct Coding Initiative) and Modifier Use

Policy CodePolicy POL-PP-226

Change TypeClarifications and additions to add-on enforcement and modifier guidance

Effective DateFeb 15, 2022

Next Review Date

Key ActionDocument medical justification when using NCCI-designated modifiers (e.g., 59 or -X{EPSU}) to override PTP edits; ensure primary/add-on codes are billed per policy or document exceptions.

SourceLink

On This Page

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

NCCI Application and Exceptions

NCCI application and exceptions

Blue KC will apply NCCI edits to claims and allow recognized exceptions when properly documented; specific rules for modifiers, MUE adjudication, and add-on codes are defined below.

Apply NCCI Procedure-to-Procedure (PTP) edits per the NCCI table: columns 1 and 2 list the code pair and column 3 indicates whether an NCCI-designated modifier may bypass the edit (0 = not allowed, 1 = allowed).

ALL of the following

Examples of acceptable modifier-supported circumstances
- Different session (XE) — service distinct because it occurred during a separate encounter.
- Different practitioner (XP) — service distinct because a different practitioner performed it.
- Separate structure/organ (XS) — service distinct because it was performed on a separate organ/structure.
- Unusual non‑overlapping service (XU) — service does not overlap usual components of the main service.
- Other allowed modifiers include anatomic modifiers (E1–E4, FA, F1–F9, TA, T1–T9, LT, RT, LC, LD, RC, LM, RI), global surgery modifiers (24, 25, 57, 58, 78, 79), and other modifiers (27, 59, 91).

Do not use modifier 59 or -X{EPSU} modifiers to bypass an NCCI PTP edit unless the specific, documented criteria for that modifier have been met; modifier 59 should be reserved for situations where a more descriptive modifier is not available.

Medically Unlikely Edits (MUE): enforce MUE values from the MUE table. Column 2 lists allowed units; Column 3 lists the MUE Adjudication Indicator (MAI).

ALL of the following

MAI behaviors
- MAI = 1: edit applied at the claim line level — appropriate use of modifiers (e.g., 76, 77, 91, RT, LT, F1, F2) and supporting documentation can allow reporting of medically necessary units in excess of the MUE value.
- MAI = 2: absolute/date‑of‑service limit — no instance allows payment above the listed MUE value.

ALL of the following

Blue KC enforces Type I add‑on code edits. Type II and Type III add‑on code requirements are not currently enforced by Blue KC.
With few exceptions, primary and add‑on codes must be billed on the same day by the same provider.
Exception: An exception exists for initial drug administration per vascular access site during an encounter (including observation stays that span calendar days): an add‑on code may be billed on a different date of service to avoid billing the initial drug administration twice during the same stay — documentation must support the exception.

Documentation requirements: medical documentation must substantiate modifier use and any exception to MUE or add‑on billing rules. Improper use of modifiers to bypass edits is disallowed and will be denied without adequate documentation.

Scope and application: these NCCI rules apply to both professional (medical) and facility claims across all lines of business; payment remains subject to member benefit plan terms and provider contract agreements.

Code Examples, MUEs, and PTP Examples

Example add-on codes and primary code pairingsCPTCovered

0649T

Add-on code — use with listed primary imaging codes when evaluating same organ/gland/tissue/target structure (Primary codes: 70540, 70542, 70543, 70551, 70552, 70553, 71550, 71551, 71552, 72141, 72142, 72146, 72147, 72148, 72149, 72156, 72157, 72158, 72195, 72196, 72197, 73218, 73219, 73220, 73221, 73222, 73223, 73718, 73719, 73720, 73721, 73722, 73723, 74181, 74182, 74183, 75557, 75559, 75561, 75563, 76498, 77046, 77047, 77048, 77049, 0398T)

0663T

Add-on code — use with listed chemotherapy administration codes (Primary codes: 96409, 96411, 96413, 96415, 96416, 96417)

PTP edit examplesCPT

91302

Example PTP pair (91302 / 91303) with modifier indicator guidance

MUE values and MAI — table structure and adjudication indicator summary

MUE table columnsMUE NCCI table has 4 columns: Column 1 = CPT/HCPCS code; Column 2 = allowed MUE value (units); Column 3 = MUE Adjudication Indicator (MAI) which indicates adjudication type; Column 4 = instructions/notes.

MAI = 1 (line-level)MAI of 1 indicates the edit is applied at the claim line level; appropriate use of modifiers (e.g., 76, 77, 91, RT, LT, F1, F2) or other documentation to report the same code on separate lines may enable payment in excess of the MUE.

MAI = 2 (absolute)MAI of 2 indicates an absolute (date-of-service) limit—there is no instance in which a higher value is payable.

Adjudication guidanceAppropriate medical documentation must support exceptions to MUEs; refer to Blue KC MUE policy POL-PP246 for additional rules and operational guidance.

Billing, Modifier Use, and Prior Authorization

Prior Authorization

Prior Authorization and Benefits — Provider Billing Requirements

Providers must follow NCCI Procedure-to-Procedure (PTP) guidance when billing services that may be subject to edits. Blue KC adheres to the NCCI PTP table format where Column 1 and Column 2 list the potentially conflicting codes and a modifier indicator (0, 1, or 9) indicates whether an NCCI-designated modifier may be used to bypass the edit. Use of an allowed modifier must be appropriate, supported by documentation, and consistent with CPT guidance.

Verify modifier indicator in the NCCI PTP table: 0 = modifier not allowed; 1 = NCCI-designated modifier may be used (if appropriate); 9 = not applicable.

Billing Rule

Modifier use to override NCCI PTP edits

When a PTP edit lists a Modifier Indicator of "1", certain modifiers may be used to override the edit when supported by clinical documentation. Appropriate use of these modifiers must follow CPT guidance (modifier 59 should be used only when a more descriptive modifier is not available) and documentation must show why both services were medically necessary and distinct.

Key Terms

PTP (procedure-to-procedure) — short definition

DefinitionProcedure-to-procedure (PTP) edits prevent inappropriate payment for services that should not be reported together by identifying code pairs where simultaneous reporting is restricted.

FormatPTP edits are published in a table with two code columns defining the conflicting procedures and a third column for modifier indicator guidance.

Modifier overrideWhen a PTP edit exists, an NCCI-designated modifier indicator determines whether an allowed modifier can be used to permit payment for both services; documentation must support modifier use.

MUE — definition and MAI

DefinitionMedically Unlikely Edits (MUE) set the allowed number/quantity of the same CPT/HCPCS service on a single date of service and are published in an NCCI MUE table.

Table structure