CO-185 — Rendering Provider Not Eligible to Perform Service

Denial Identifier

• Primary CARC: CO-185 — "The rendering provider is not eligible to perform the service billed." (X12)
• Related CARCs: 183 (referring provider not eligible to refer the service billed), 184 (prescribing/ordering provider not eligible to prescribe/order the service billed)
• Common RARCs: N95 ("This provider type/provider specialty may not bill this service."), M68 ("Missing/incomplete/invalid attending, ordering, rendering, supervising or referring physician identification."), MA102 ("Missing/incomplete/invalid name or provider identifier for the rendering/referring/ordering/supervising provider.")

Plain-Language Meaning

• The specific individual listed as having performed the service is not, per the payer's records, allowed to perform/bill that type of service — this differs from D14 (overall enrollment) in that it focuses on scope-of-practice/specialty eligibility for this particular service.

Why the Claim Was Denied

• Provider credentialing: rendering provider's specialty/scope does not include the billed service per payer policy (e.g., a service requiring specific certification)
• Clinical department: supervision requirements not met for a service requiring physician supervision (e.g., incident-to billing where direct supervision under 42 CFR §410.26 was not present)
• Claim construction: correct rendering provider was omitted or the wrong NPI submitted

Information the Biller Must Review

• Rendering provider NPI and name, provider specialty/taxonomy, supervision documentation (if incident-to or supervised service), payer-specific scope-of-practice policy, medical record identifying who actually performed the service.

What Needs to Be Corrected

• Claim correction: If the correct, eligible rendering provider was simply omitted or mis- entered, correct the NPI/name and resubmit.
• Upstream correction: If the rendering provider genuinely is not eligible to bill that service type with that payer, this is a credentialing/scope-of-practice issue; the fix is enrollment or supervision-workflow correction, not claim substitution.

Resolution Workflow

• Confirm who actually performed the service per the medical record.
• Verify that provider's NPI and specialty were correctly submitted.
• If a data-entry error, correct and resubmit.
• If the actual rendering provider is not eligible for that service under payer policy, evaluate whether the service can be legitimately billed under the supervising/collaborating provider per incident-to or shared-service rules (only if those rules were actually met — direct supervision, established patient/plan of care, etc.).
• Document the eligibility finding.
• Escalate to Credentialing/Clinical Department if the provider needs additional certification or if supervision requirements were not actually met.

Department Most Likely Responsible

• Resolves current claim: Billing, Credentialing. Prevents recurrence: Clinical Department — ensure supervision requirements are met and documented for incident-to/shared services;
• Credentialing — confirm specialty-specific payer eligibility before scheduling.

Prevention Control

• Pre-service check of rendering-provider eligibility for the specific service and payer; incident- to/supervision documentation checklist; NPI-to-taxonomy validation at charge entry.

Escalation Trigger

• Supervision requirements for incident-to billing were not actually met (compliance issue, not a billing fix); provider scope-of-practice dispute with payer.

Sample Scenario

• Scenario: Claim denied CO-185.
• Finding: An advanced practice provider performed a service requiring physician-level certification per payer policy; documentation confirms the APP, not the physician, rendered the service without qualifying incident-to supervision.
• Action: Claim written off / rebilled under the APP's own eligible-service scope where applicable; supervision workflow reviewed with Clinical Department.

Resolution path at a glance

AI Search Terms / Synonyms

• CO185; CO-185; rendering provider not eligible; provider scope denial; incident-to denial; N95.

AI Answer Guardrail

• Confirm who actually performed the service and whether all incident-to/supervision requirements were genuinely met before recommending any change to the billed provider.

Sources

• X12 CARC list; X12 RARC list; CMS Incident To Services & Supplies (42 CFR §410.26)