Quick Explanation
Denial code CO-117 indicates that the insurer has denied or reduced payment for transportation services because the patient was not taken to the geographically nearest facility capable of treating their condition. According to federal and commercial payer guidelines, ambulance transport is only covered to the closest appropriate facility, and mileage beyond that point is considered medically unnecessary.
Common Causes for CO-117
Denials with code CO-117 typically happen for the following specific reasons:
- Transporting a patient to a preferred or family-requested hospital that is located further away than closer, equally capable emergency facilities.
- Failing to document that closer facilities were on diversion status or lacked the specialized services (such as a level 1 trauma center, burn unit, or neonatal ICU) required by the patient.
- Omission of necessary ambulance destination modifiers or incomplete Run Sheets/Patient Care Reports (PCRs) that justify the bypass of closer medical centers.
- Lack of physician certification or clinical evidence proving that the closer facilities were incapable of treating the patient's immediate acute condition.
How to Prevent CO-117 Denials
To avoid receiving this denial in the future, implement these specific checks:
- Ensure EMTs and paramedics meticulously document the patient's specific clinical needs and why closer hospitals were bypassed in the Patient Care Report (PCR).
- Consistently record and archive hospital diversion logs or emergency communication records at the time of transport to prove closer facilities were unavailable.
- Train billing staff to utilize specific medical necessity modifiers and verify that the documented ICD-10 codes align with the necessity of a specialized destination.
- Implement automated system checks to flag transport claims where the mileage significantly exceeds the average distance to the nearest local emergency department.
Appeal Letter Template for CO-117
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-117 - Transportation is only covered to the closest appropriate facility
Dear Appeals Department,
I am writing to appeal the denial of the above-referenced claim, which was denied with code CO-117: "Transportation is only covered to the closest appropriate facility".
Pursuant to the CMS Medicare Benefit Policy Manual, Chapter 15, Section 10.2.2, an ambulance transport is covered to the closest appropriate facility that is adequately equipped to provide the necessary care. In this case, while closer facilities exist geographically, they were not 'appropriate' at the time of transport. The attached medical documentation and dispatch logs demonstrate that the patient required specialized intervention that could only be provided by the destination facility, or that closer facilities were on active diversion status. Because the chosen destination was the nearest facility capable of managing the patient's acute clinical emergency, we respectfully request that this denial be overturned and the claim be processed for full payment.
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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