CARC 206 Active

CO-206: National Provider Identifier - Missing

TL;DR

Add the missing NPI to the claim and resubmit. Do not appeal.

Action
Verify & Resubmit
Who Pays
Provider
Appeal
No
Patient Impact
None
Disclaimer
This content is for informational purposes only and does not constitute professional billing advice. Always verify information against your payer contracts and current coding guidelines. Consult a certified billing specialist for specific claim issues.

What Does CO-206 Mean?

With CO (Contractual Obligation), the missing NPI is the provider's responsibility to correct. Add the NPI and resubmit. Do not appeal — this is a correctable data entry issue.

CARC 206 indicates that one or more NPI fields on the claim were left blank. Claims require NPIs for various provider roles — billing provider, rendering provider, referring provider, and ordering provider — depending on the service type. The payer's system could not match the claim to a provider because the NPI field was empty.

This is a data entry issue, not a coverage or medical necessity denial. The fix is straightforward: add the missing NPI to the correct field and resubmit the claim. This code frequently affects claims for services that require an ordering or referring provider NPI, such as laboratory work, imaging, and DME.

Common Causes

Cause Frequency
NPI field left blank on the claim The claim was submitted without a National Provider Identifier in the required field(s), such as the billing, rendering, referring, or ordering provider NPI Most Common
Ordering/referring provider NPI not included Services that require an ordering or referring provider NPI (such as lab work or imaging) were submitted without this information Most Common
NPI not submitted in the correct field The NPI was entered in the wrong claim field or loop, making it appear missing to the payer's adjudication system Common
Practice management system configuration error The billing software was not configured to populate the NPI field automatically, or the provider record is incomplete Common
New provider not yet set up in billing system A new provider rendered services but their NPI was not yet entered into the practice management or billing system Occasional

How to Resolve

  1. Identify the missing NPI Determine which provider role NPI was missing from the claim.
  2. Add the NPI and resubmit Enter the correct NPI and resubmit the claim.
  3. Fix system configuration Update your billing system to prevent the NPI from being omitted on future claims.
Do Not Appeal This Code

The NPI was missing from the claim submission. This is a data entry issue that requires correction and resubmission. Add the missing NPI to the appropriate field and resubmit the claim.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-206:

RARC Description
N285 Missing/incomplete/invalid referring provider information. Add the missing referring provider NPI and resubmit the claim →
MA130 Your claim contains incomplete and/or invalid information, and no appeal rights are afforded. Correct the missing NPI and resubmit as a corrected claim →
N265 Missing/incomplete/invalid ordering provider information. Add the missing ordering provider NPI and resubmit →

How to Prevent CO-206

Also Filed As

The same CARC 206 may appear with different Group Codes:

OA-206 PR-206

Related Denial Codes

CO-207 — National Provider Identifier - Invalid Format CO-208 — National Provider Identifier - Not Matched CO-16 — Missing Information or Billing Error CO-226 — Provider Information Not Provided or Insufficient CO-227 — Patient/Insured Information Not Provided or Insufficient

Sources

  1. https://x12.org/codes/claim-adjustment-reason-codes
  2. https://www.mdclarity.com/denial-code/206
  3. https://med.noridianmedicare.com/web/jeb/topics/claim-submission/reason-code-guidance/missing-incorrect-req-npi-info
  4. Codes maintained by X12. Visit x12.org for official definitions.