CO-206 — NPI Missing, Invalid, or Not Matched
The claim is missing an NPI where one is required, the NPI is not in a valid format, or the NPI submitted does not match the provider name/role on the payer's file (including PECOS ordering/referring records, w…
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In plain language
The claim is missing an NPI where one is required, the NPI is not in a valid format, or the NPI submitted does not match the provider name/role on the payer's file (including PECOS ordering/referring records, where applicable).
Start here
Identify which NPI role (billing/rendering/referring/ordering) triggered the denial from the CARC/RARC.
Who resolves it
Billing/Follow-Up
Who prevents it
Provider Enrollment — PECOS enrollment verification for all ordering/referring providers; Information Systems — NPI field validation before claim export.
Sources
- X12 CARC list; X12 RARC list; CMS Ordering & Certifying / PECOS
Validated ClaimetryX Source — Denial Management Knowledge Base, 2026 Research Edition
Research date August 18, 2026. CARC/RARC combinations and payer processes vary. Always check the specific remittance advice and the payer's current requirements before acting on any denial.
Published by ClaimetryX. Sources identify the code standards, agency guidance, and payer policies supporting this reference. How we use sources
How to resolve this denial, step by step
- 1
Identify which NPI role (billing/rendering/referring/ordering) triggered the denial from the CARC/RARC.
- 2
Verify the correct NPI in NPPES and, for ordering/referring, in PECOS.
- 3
If a claim-level data error, correct and resubmit.
- 4
If the ordering/referring provider is not in PECOS, route to Provider Enrollment for PECOS enrollment; hold or appeal per payer timeline once enrollment completes.
- 5
Document the NPI verification outcome.
- 6
Escalate to Information Systems if NPIs are being dropped or truncated systemically during claim export.
Then choose the correct disposition
Corrected claim
for data-entry/transmission NPI errors.
Provider enrollment correction
when the ordering/referring provider lacks PECOS enrollment.
Formal appeal
only after the underlying NPI/PECOS issue is actually resolved; an appeal will not succeed while the enrollment gap remains open.
Stop and escalate when
- Referring/ordering provider is a non-employed outside physician who is unresponsive to PECOS enrollment requests; systemic NPI field corruption in claim exports.
What Needs to Be Corrected
- Claim correction: If the correct NPI exists but was omitted, malformed, or mismatched due to a data-entry/transmission error, correct and resubmit.
- Upstream correction: If the ordering/referring provider is not enrolled in PECOS at all, this is a Provider Enrollment issue — the referring physician (or NPP) must complete PECOS enrollment before the claim can be paid.
Do Not Do This
- Do not submit an organizational (Type 2) NPI in a field requiring an individual (Type 1) ordering/referring NPI.
- Do not substitute a different, unrelated provider's NPI to bypass the edit.
Plain-Language Meaning
- The claim is missing an NPI where one is required, the NPI is not in a valid format, or the NPI submitted does not match the provider name/role on the payer's file (including PECOS ordering/referring records, where applicable).
Why the Claim Was Denied
- Claim construction: NPI field blank or malformed during claim creation/transmission
- Provider enrollment: ordering/referring provider's individual (Type 1) NPI is not enrolled in PECOS as required, or an organizational (Type 2) NPI was submitted where an individual NPI is required
- Registration/Claim construction: wrong provider's NPI entered (name/NPI mismatch)
Information the Biller Must Review
- Billing, rendering, referring, and ordering NPIs as applicable, NPI format validity, PECOS enrollment status for ordering/referring providers (individual NPI required — organizational NPIs do not qualify), name-to-NPI match against the NPPES registry.
Sample Scenario
- Scenario: Lab claim denied CO-208/N286.
- Finding: Ordering physician's individual NPI does not appear in the CMS ordering/referring PECOS file.
- Action: Practice contacts the ordering physician's office to confirm/complete PECOS enrollment; claim held pending enrollment confirmation.
Denial Identifier
- Primary CARCs: CO-206 — "National Provider Identifier - missing." CO-207 — "National Provider identifier - Invalid format." CO-208 — "National Provider Identifier - Not matched." (X12)
- Common RARCs: N433 ("Resubmit this claim using only your National Provider Identifier (NPI)."), N516 ("Records indicate a mismatch between the submitted NPI and EIN."), M68, MA102, N286/N290 (referring/rendering provider primary identifier), N277 (other payer rendering provider identifier)
Prevention Control
- NPI validation against NPPES/PECOS at charge entry; claim-scrubber edit requiring individual NPI for ordering/referring fields; periodic PECOS-enrollment audit for all referring providers used by the practice.
Department Most Likely Responsible
- Resolves current claim: Billing/Follow-Up. Prevents recurrence: Provider Enrollment — PECOS enrollment verification for all ordering/referring providers; Information Systems — NPI field validation before claim export.
AI Answer Guardrail
- Confirm which specific provider role (billing/rendering/referring/ordering) triggered the NPI edit and verify PECOS enrollment status before recommending a correction or appeal.
AI Search Terms / Synonyms
- CO206; CO207; CO208; NPI missing; NPI invalid; NPI not matched; PECOS denial; ordering referring NPI.
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