How do I fix a CO-236 denial?

Check the code pair against the payer edits before submission (the NCCI PTP table for practitioner claims); where a modifier indicator permits and the facts justify it, add the bypass modifier with documentation

CO-236 — Procedure combination not allowed together

Claim-adjustment reason code 236 · typically reported as CO-236

What it means

Two codes on the same day conflict under coding rules (NCCI procedure-to-procedure edits on practitioner and outpatient claims, or payer-specific compatibility edits).

Why DME claims hit it

Mutually exclusive HCPCS billed same-day (e.g., two base items that can’t coexist)
Component + comprehensive code pairs without a valid bypass

How to fix it

Check the code pair against the payer edits before submission (the NCCI PTP table for practitioner claims); where a modifier indicator permits and the facts justify it, add the bypass modifier with documentation

Appeal posture

Only via the modifier-indicator path with supporting documentation.

Related denial codes

CO-97 — Bundled — included in another adjudicated service CO-18 — Exact duplicate claim or service

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