Modifier KX
Requirements specified in the medical policy have been met
✅ When to Use Modifier KX
Attestation that LCD/NCD criteria have been met. Common with therapy cap exceptions and DME.
📋 Documentation Requirements
Medical policy criteria documentation on file.
Coding Tips for Modifier KX
Real-world specialist guidance from the PayerReady Medical Coding Team, including audit triggers, denial patterns, and payer policy variations.
Documentation on file supports medical necessity beyond a usage cap (therapy threshold, DME quantity, etc.). Frequent target of OIG audits. Chart must specifically justify exceeding the cap, generic statements like "patient needs more" will fail review.
Modifier KX FAQ
What does modifier KX mean? +
Requirements specified in the medical policy have been met
When should I use modifier KX? +
Attestation that LCD/NCD criteria have been met. Common with therapy cap exceptions and DME.
When should I NOT use modifier KX? +
Avoid appending this modifier if the documentation does not support its use.
What documentation is required for modifier KX? +
Medical policy criteria documentation on file.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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