Modifier Matrix

The Modifier Matrix provides verified, payer-specific rulings for 18 modifier codes across Medicare, Blue Cross Blue Shield, UnitedHealthcare, Aetna, and Cigna — 204 records total. Each record documents whether the modifier is recognized by the payer, the conditions under which it is accepted, common denial reasons for modifier misuse, and the documentation required to support the modifier claim.

Modifier coverage includes: -25 (significant, separately identifiable E&M service on the same day as a procedure), -26 (professional component), -TC (technical component), -59 (distinct procedural service), -XE/XS/XP/XU (NCCI derivative modifiers), -51 (multiple procedures), -52 (reduced services), -53 (discontinued procedure), -76 (repeat procedure by same physician), -77 (repeat procedure by different physician), -GT (via interactive audio and video telecommunication), -95 (synchronous telemedicine), -FQ (telehealth furnished using audio-only), and others.

Modifier -25 generates the highest denial volume of any modifier — CO-4 (service inconsistent with modifier) is the most common denial code associated with modifier -25 misuse. The key documentation standard is that the evaluation and management service must be above and beyond the usual pre- and post-operative care associated with the procedure performed on the same day. The medical record must document a separate clinical decision-making process for the E&M encounter and the procedure, identifiable in the documentation as distinct services.

• Denial Decoder — CO-4 modifier denial decision tree
• Appeal Letter Builder — modifier denial appeals
• Denial code lookup — CO-4 and CO-97 modifier codes