Service not medically necessary or does not meet medical criteria (Updated for 2026)

Common Causes for CO-180

Denials with code CO-180 typically happen for the following specific reasons:

• The diagnosis codes (ICD-10-CM) billed on the claim do not support the medical necessity of the procedure code (CPT/HCPCS) according to the payer's LCD, NCD, or internal coverage policies.
• Medical records lack documentation of required prerequisite steps, such as conservative trial treatments, physical therapy, or specific diagnostic test results.
• The billed service exceeded the frequency or utilization limits established by CMS or commercial payer medical necessity guidelines for the patient's condition.
• Prior authorization was not obtained, or the clinical documentation submitted during the authorization process did not sufficiently satisfy the payer's medical necessity criteria.

How to Prevent CO-180 Denials

To avoid receiving this denial in the future, implement these specific checks:

• Utilize advanced claim scrubbing software that cross-references CPT and ICD-10 codes against current LCD and NCD medical necessity guidelines prior to claim submission.
• Establish robust prior authorization workflows to ensure clinical criteria are fully vetted, documented, and approved by the payer before elective procedures are scheduled.
• Conduct regular documentation audits and clinician education focusing on the clear recording of subjective symptoms, objective findings, and the failure of conservative management therapies.
• Develop pre-procedure checklists for scheduling teams to verify that all medical policy requirements (e.g., specific lab values, prior imaging) are documented in the chart before the service is performed.

Appeal Letter Template for CO-180

If you believe this claim was denied incorrectly, you can use the following template to submit an appeal.

[Your Practice Header]
[Date]

[Payer Name]
[Appeals Department Address]

RE: Appeal for Claim [Claim Number]
Patient: [Patient Name]
ID: [Patient ID]
Date of Service: [Date]
Denial Code: CO-180 - Service not medically necessary or does not meet medical criteria

Dear Appeals Department,

I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-180: "Service not medically necessary or does not meet medical criteria".

We are appealing the denial of CPT code [Insert CPT Code] for [Patient Name] under denial code CO-180 (Service not medically necessary). The enclosed clinical documentation clearly demonstrates that this service met all established medical necessity criteria outlined in CMS National Coverage Determinations (NCD) and the payer's local medical policies. The patient presented with [Insert Clinical Indication/Symptom], which is objectively supported by [Insert Diagnostic Result/Imaging], and had previously failed conservative management consisting of [Insert Prior Conservative Treatment] over a period of [Insert Timeframe]. According to AMA and CMS guidelines, services are deemed medically necessary when they are clinically appropriate in terms of type, frequency, extent, and duration. Because the patient's medical record comprehensively substantiates the severity of the condition and the necessity of this intervention, we respectfully request that you review the attached clinical chart and reverse this denial.

Attached please find:
1. A copy of the original claim.
2. The relevant medical records supporting the service.
3. [Any other supporting documents].

We respectfully request that you reprocess this claim for payment.

Sincerely,

[Your Name]
[Title]
[Practice Name]