Quick Explanation
The CO-73 denial code signifies that a claim has been rejected because the payer has no record or evidence of a valid prescription or order from a licensed physician for the billed service or equipment. Under standard insurance guidelines, particularly for durable medical equipment (DME), physical therapy, and specialized diagnostic tests, a formal physician order is a fundamental prerequisite to establish medical necessity. Without this documented authorization linked to the claim, insurers will deny coverage.
Common Causes for CO-73
Denials with code CO-73 typically happen for the following specific reasons:
- A signed and dated physician order or prescription was not obtained prior to dispensing the equipment or performing the service.
- The ordering/referring physician's name and National Provider Identifier (NPI) were omitted or incorrectly reported in Box 17 and 17b of the CMS-1500 claim form.
- The physician's order on file had expired, lacked a legally binding signature, or was issued by a practitioner who lacked active prescribing authority.
- A mismatch occurred between the specific equipment or service billed and the exact description outlined in the physician's written order.
How to Prevent CO-73 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Implement a hard-stop pre-billing review to confirm a valid, signed physician order is electronically attached to the patient's chart prior to claim submission.
- Ensure billing software automatically validates and populates the ordering physician's credentials and NPI in the designated electronic loops (Loop 2310A/2420F) or CMS-1500 fields.
- Establish a strict compliance check to verify that all written orders meet the detailed signature and date requirements set forth by CMS and commercial payers.
- Cross-reference the HCPCS/CPT codes on the claim directly with the physician's written prescription to guarantee precise alignment before dispensing or billing.
Appeal Letter Template for CO-73
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-73 - Service/equipment was not prescribed by a physician
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-73: "Service/equipment was not prescribed by a physician".
We are appealing the denial of this claim (CO-73) for the billed service/equipment. Contrary to the initial determination, a valid physician's prescription was active and documented prior to the date of service. In accordance with CMS Program Integrity Manual guidelines (Pub. 100-08, Chapter 5) regarding ordering and certifying requirements, we have enclosed the formal, signed, and dated physician order outlining the clinical necessity for this service. The prescribing physician holds an active license and valid NPI, satisfying all regulatory prerequisites. We respectfully request that you review the attached clinical documentation and reprocess this claim for full reimbursement.
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]
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