CO-171 denial code
Payment denied when performed or billed by this type of provider in this type of facility
How to fix it
Confirm the place of service and provider taxonomy are correct, then resubmit if either was wrong.
How to prevent it
Validate place-of-service and taxonomy pairs per payer during scrubbing.
In practice
A therapist bills a service delivered in a skilled nursing facility. The payer returns CO-171, because that provider type is not separately payable for that service in that setting.
The denial is about the combination rather than either element. The provider is enrolled, the service is covered, and the facility is legitimate; what fails is the intersection of the three under the payer's payment rules.
Confirm the place of service and taxonomy submitted are both accurate, since a mismatch in either produces this code without any underlying policy problem. Where both are right, the service is likely bundled into the facility's payment and should be billed there instead.
What sits behind it
Consolidated billing in skilled nursing facilities is the largest single source. Many services delivered to residents during a covered stay are included in the facility's payment and cannot be billed separately by the rendering provider, whatever their own enrolment status.
Similar bundling applies in other settings — hospice, inpatient rehabilitation and certain home health episodes each absorb services that would be separately payable elsewhere. Knowing the patient's status on the date of service determines who to bill.
The prevention is a status check rather than a coding change. Establishing whether a patient is in a covered facility stay before billing tells you immediately whether the claim goes to the payer or the facility, and it is a check most practices only add after being caught once.
Related codes
Terms used here — CMS-1500 · Credentialing · Denial
How we handle it — Claims Management · Provider Credentialing · Denial Management
Primary sources
The rules behind CO-171, at the bodies that publish them.
- PECOS Medicare enrollment (opens in a new tab)
Centers for Medicare & Medicaid Services — Where Medicare provider enrollment is filed and maintained. Revalidation deadlines missed here stop payment outright.
- NPI Registry (NPPES) (opens in a new tab)
Centers for Medicare & Medicaid Services — Public lookup and management for National Provider Identifiers. A stale NPPES record is a quietly common cause of enrollment and claim rejections.
- Medicare Claims Processing Manual (opens in a new tab)
Centers for Medicare & Medicaid Services — The operative manual for how Medicare claims must be coded, submitted, adjusted and appealed. When a payer policy and a vendor's advice disagree, this settles it.
Looking for a different code? Search all 190 CARC and RARC codes
Questions about CO-171
Usually because it is bundled into the facility's own payment. Skilled nursing consolidated billing is the largest source, with hospice, inpatient rehabilitation and some home health episodes absorbing services the same way. The service is payable; the payer is the facility, not the plan.
Check status at registration or before billing, either through the eligibility response or by asking the facility. Practices usually add this check only after absorbing several denials, but it takes moments and determines who should receive the claim.
Yes, and it is worth ruling out first. An incorrect place of service or a taxonomy that misstates the provider's enrolled specialty produces the same code with no underlying policy issue, and correcting either resolves it immediately.
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