Bonnie Patterson | CPC, CPMA, CMRS, CMCS
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Modifier Decision Trees

A practical, audit-focused resource for reviewing modifier use, documentation support, and common compliance risks.

Built for Audit-Ready Decision Making

Modifier selection should reflect the documented circumstances of the service—not an effort to bypass edits or increase payment. This original guide supports consistent, defensible review of commonly audited modifiers.

Documentation Support Review whether the medical record clearly supports the modifier and the circumstances it represents.
Audit Risk Awareness Recognize patterns that may trigger internal, payer, or regulatory scrutiny.
Decision Framework Apply a structured review process before assigning or validating a modifier.
Common Pitfalls Identify unsupported use, documentation gaps, and recurring process weaknesses.
Educational-use notice: This independently developed resource does not replace current code sets, official coding instructions, payer policies, National Correct Coding Initiative edits, or organization-specific compliance guidance.
THINK LIKE AN AUDITOR

Ask These Three Questions

Before accepting a modifier, pause and test whether the claim is fully supported, distinct, and compliant.

1

Does the documentation clearly support why the modifier is necessary?

2

Are the reported circumstances distinct, separate, and fully documented?

3

Does the modifier comply with current coding guidance and applicable payer requirements?

Official Guidance

This educational resource was developed using official coding and reimbursement guidance, including the American Medical Association (AMA) Current Procedural Terminology (CPT®) Professional Edition, the Centers for Medicare & Medicaid Services (CMS) National Correct Coding Initiative (NCCI) Policy Manual, the CMS Medicare Claims Processing Manual, and applicable payer policies. Always verify the most current official guidance before applying any coding decision.

AUDIT-READY RESOURCE CENTER

Think Like an Auditor. Code with Intent. Defend with Confidence.