CO-170 Denial Code: Payment Denied When Performed/Billed by This Type of Provider
CO-170 is a claim adjustment reason code meaning payment is denied when performed or billed by this type of provider. The service is outside the billing provider's recognized scope, specialty, or enrollment type, such as a chiropractor billing E/M to Medicare. Fixes involve correct provider assignment, taxonomy, or enrollment, not code changes.
- Group
- CO (Contractual Obligation)
- Category
- Provider type / scope / enrollment
- Appealable?
- Yes, if the provider type is actually eligible
- Typical fix
- Rebill under eligible provider, fix taxonomy/enrollment, or write off
What does denial code CO-170 mean?
CO-170 means "payment is denied when performed/billed by this type of provider." The payer looked at who billed, or who performed, and decided that provider type is not payable for this service. It is a who-problem, not a what-problem: the same CPT from a different provider type might pay without a hiccup.
Example: a chiropractor bills Medicare 99203 (new patient E/M) at $155.00 alongside 98941. The ERA shows 98941 paid at the fee schedule rate, but the E/M line reads: billed $155.00, allowed $0.00, CO-170 $155.00, paid $0.00. Medicare pays doctors of chiropractic for manual manipulation of the spine only; every other service from a DC is statutorily excluded.
Why did the claim get a CO-170?
- Statutory or policy scope limits on the provider type: chiropractors, and for some payers acupuncturists, naturopaths, or certain behavioral health license levels.
- Wrong taxonomy code or specialty on file, so the payer thinks you are a provider type you are not.
- Enrollment category mismatch: the clinician is enrolled, but not in the category that carries the billed benefit (common with mid-levels and with labs or DME billed under the wrong enrollment).
- Rendering vs. billing provider confusion, where a service was billed under a group or supervising NPI in a scenario the payer requires the performing provider's own enrollment.
How do you fix and resubmit a CO-170 denial?
- Identify exactly which provider type the payer has on file: check the enrollment record (PECOS for Medicare) and the taxonomy attached to the NPI on the claim.
- If the payer's file is wrong, correct the taxonomy or specialty designation, then resubmit once the update posts. This fixes the whole future stream, not just one claim.
- If the service was performed by an eligible provider but billed under the wrong NPI, rebill with the correct rendering/billing combination, provided the arrangement legitimately supports it.
- If the provider type truly cannot be paid for the service, stop billing it to that payer and set the workflow so those services route to an eligible clinician, or to the patient with proper advance notice.
How do you prevent CO-170 denials?
Verify each clinician's enrollment category, specialty, and taxonomy with every major payer during onboarding, before their first claim, as part of Medicare provider enrollment and commercial credentialing. Keep a services-by-provider-type matrix for your payer mix so schedulers do not book excluded services with the wrong clinician. Re-verify after any license upgrade, specialty change, or revalidation, which is when payer files silently break.
Can you appeal a CO-170 denial?
Yes, when the provider type is actually eligible and the denial rests on bad data: wrong taxonomy, stale specialty, or a misapplied edit. Appeal with the enrollment approval letter, the NPI registry record, and the payer's own provider manual language showing the type is payable for the service. Statutory exclusions, like non-manipulation services from a DC under Medicare, are not appealable; do not spend the postage. Check your window with the appeal deadline calculator, generate the letter with the appeal letter generator, and decode any companion remarks in the denial code lookup.
Frequently asked questions
The payer will not pay this service when it is performed or billed by this type of provider. The CPT code itself may be fine and the patient covered; the problem is the match between the service and the billing provider's specialty, license type, or enrollment category in the payer's records.
Chiropractors billing Medicare for anything beyond spinal manipulation (Medicare covers only 98940-98942 from DCs), plus naturopaths, acupuncturists, counselors, and other license types a payer does not recognize for a given service. It also hits clinicians whose taxonomy or specialty is wrong in the payer's file.
Only when incident-to or supervision rules genuinely apply: the physician must have initiated the plan of care, be present in the office suite, and the service must meet every incident-to element. Rebilling under another NPI just to dodge CO-170, without meeting the rules, is misrepresentation.
Sources & further reading
Reviewed by the ImmediCare Solutions RCM team
Certified billers and coders handling claims across 50+ specialties nationwide. This entry is reviewed against current payer policy and CMS rules. Last review: Jul 5, 2026.
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