Denial code CO-170: Payment denied for this provider type
The payer does not reimburse this service when it is billed by a provider of this type.
Payment is denied when performed/billed by this type of provider.
What CO-170 actually means
The payer’s policy restricts who may be paid for the service. This commonly affects mid-level providers, therapy assistants, and services subject to supervision rules — the service is covered, but only when billed by an eligible provider type, or only with the correct supervision modifier. The fix is usually about who billed it and how, not whether the service was appropriate.
Why this denial happens
- A mid-level provider billed a service the payer restricts to physicians.
- Incident-to or supervision billing requirements were not met or not indicated.
- The provider type is not eligible for the service under the plan.
- A required supervision modifier was omitted.
How to resolve a CO-170 denial
- Confirm the payer’s provider-type rules for the service.
- Rebill under the eligible supervising provider where the supervision requirements were genuinely met and documented.
- Append the required supervision modifier and resubmit where applicable.
How to prevent it
- Map which services each provider type may bill for your top payers and enforce it at charge entry.
- Document supervision contemporaneously — it cannot be reconstructed later.
Frequently asked
What does denial code CO-170 mean?
The payer does not reimburse this service when it is billed by a provider of this type. The X12 description reads: "Payment is denied when performed/billed by this type of provider."
How do I fix a CO-170 denial?
Confirm the payer’s provider-type rules for the service. Rebill under the eligible supervising provider where the supervision requirements were genuinely met and documented. Append the required supervision modifier and resubmit where applicable.
Can CO-170 be billed to the patient?
Generally no. The recommended path for this code is "appeal or correct and resubmit" — check your payer agreement before transferring any balance to the patient.
Related denial codes
See how much CO-170 is costing you
Upload your 835 remittance files and PayerVista groups every denial by reason code, payer, and dollar impact — so this code stops being a claim you happened to notice and becomes a number you can work.
General revenue-cycle guidance, not legal, coding, or payer-specific advice. Claim adjustment reason codes are maintained by X12 and are revised periodically; payer policy and your provider agreement govern in any specific case. Always read the remark codes transmitted with the denial — they frequently carry the detail this code does not.