Official X12 description
“The billing provider is not eligible to receive payment for the service billed.”
Source: X12 Claim Adjustment Reason Codes. The X12 External Code Lists are the single authoritative source for every CARC descriptor — always verify against the current release before building a claim-scrub rule.
What CARC 299 actually means
CARC 299 denies because the billing provider is not eligible (credentialing, contract, or enrollment). Verify billing NPI's status with the payer and remedy.
Common root causes
- Billing NPI not active with the payer.
- Billing entity credentialing lapsed.
Prevention checklist
- Billing-NPI status monitoring across all contracted payers.
Appeal strategy — step by step
Most CARC 299 denials clear faster with the right remediation than with a formal appeal. Work the steps in order and escalate only when a lower-effort path has been ruled out.
- 1Resolve credentialing/enrollment gap and resubmit.
Sample appeal-letter language for CARC 299
Edit the bracketed fields before sending. This template is a starting point; a payer-specific appeal form may still be required — check the provider portal first.
Payer-specific notes
Payer-specific behavior for CARC 299 publishes here as the QuickIntell anonymized denial ETL ingests sufficient volume. In the meantime, consult the payer directory for the relevant provider manual and appeal form.
How common is CARC 299?
Out of 306 seeded CARCs, ranked by combined US monthly search volume for "CARC 299", "CO-299 denial", and "denial code 299".
Platform frequency ranks publish once the anonymized denial-rate pipeline reaches the publication threshold (strategy §12 Phase 2).
How QuickRCM prevents CARC 299
QuickRCM catches the root causes above before the 837 leaves the clearinghouse:
- Claim-scrub rules fire on every root cause listed above — the scrub references the same X12 CAS segment logic that drives the denial, so what the payer checks, QuickRCM checks first.
- When a denial lands, QuickRCM routes it to the correct worker with the documentation bundle already attached (op note, LCD citation, modifier rationale, EOB, primary 835).
- Appeal templates tuned to each CARC (including this one) pull the supporting facts from the claim and fill the bracketed fields automatically.
CAQH CORE code combinations for CARC 299
Under the CAQH CORE Payment and Remittance Uniform Use rule, health plans may pair CARC 299 only with the remark codes and group codes below for the defined business scenario 3 (Billed service not covered by the health plan). A combination outside this list on an 835 is itself a payer compliance issue worth raising.
| RARC | Remark description | Group code | Scenario |
|---|---|---|---|
| (no RARC) | CARC used without a remark code | CO, PI or PR | 3 |
| M97 | Not paid to practitioner when provided to patient in this place of service. Payment included in the reimbursement issued the facility. | CO, PI or PR | 3 |
| M115 | This item is denied when provided to this patient by a non-contract or non-demonstration supplier. | CO, PI or PR | 3 |
| M134 | Performed by a facility/supplier in which the provider has a financial interest. | CO, PI or PR | 3 |
| MA12 | You have not established that you have the right under the law to bill for services furnished by the person(s) that furnished this (these) service(s). | CO, PI or PR | 3 |
| MA47 | Our records show you have opted out of Medicare, agreeing with the patient not to bill Medicare for services/tests/supplies furnished. As result, we cannot pay this claim. The patient is responsible for payment. | CO, PI or PR | 3 |
| MA56 | Our records show you have opted out of Medicare, agreeing with the patient not to bill Medicare for services/tests/supplies furnished. As result, we cannot pay this claim. The patient is responsible for payment, but under Federal law, you cannot charge the patient more than the limiting charge amount. | CO, PI or PR | 3 |
| MA57 | Patient submitted written request to revoke his/her election for religious non-medical health care services. | CO, PI or PR | 3 |
| MA123 | Your center was not selected to participate in this study, therefore, we cannot pay for these services. | CO, PI or PR | 3 |
| N34 | Incorrect claim form/format for this service. | CO, PI or PR | 3 |
| N95 | This provider type/provider specialty may not bill this service. | CO, PI or PR | 3 |
| N191 | The provider must update insurance information directly with payer. | CO, PI or PR | 3 |
| N767 | The Medicaid state requires provider to be enrolled in the member’s Medicaid state program prior to any claim benefits being processed. | CO, PI or PR | 3 |
| N831 | You have not responded to requests to revalidate your provider/supplier enrollment information. | CO, PI or PR | 3 |
| N905 | Our records show you have opted out of Medicare, agreeing with the patient not to bill Medicare for services/tests/supplies furnished. As a result, we cannot pay this claim. The patient is not responsible for payment. | CO or PI | 3 |
| N916 | The third party will render payment to the provider, and they will reimburse you for covered services. | CO, PI or PR | 3 |
Frequently asked questions — CARC 299
What does CARC 299 mean?
CARC 299 is an X12 Claim Adjustment Reason Code. The official definition is: "The billing provider is not eligible to receive payment for the service billed." In plain English, the payer is telling you cARC 299 denies because the billing provider is not eligible (credentialing, contract, or enrollment). Verify billing NPI's status with the payer and remedy.
How do I resolve a CARC 299 (CO-299) denial?
Start with the most common root cause: Billing NPI not active with the payer. First step: Resolve credentialing/enrollment gap and resubmit. See the full remediation and appeal checklist on this page before filing a formal appeal.
Is CARC 299 patient responsibility?
No — CARC 299 is typically carried under CO (Contractual Obligation) or OA (Other Adjustment), which means it is the provider's responsibility, not the patient's. Do not bill the patient unless the 835 CAS group code is PR.
What does CARC 299 look like on an EOB or 835 remittance?
On the 835 ERA, CARC 299 appears in Loop 2110 CAS segment as "CAS*CO*299*{amount}". On a paper EOB the same code prints in the Adjustment/Denial Reason column with the X12 description: "The billing provider is not eligible to receive payment for the service billed." — usually paired with one or more RARC remark codes in the same remittance line for additional context.
Can CARC 299 be appealed successfully?
Yes — when the root cause does not apply to the specific claim. Overturn rates are strongest when the appeal cites the X12 definition, the payer's own published policy, and documentation that rebuts the payer's rationale. The sample appeal language block above is a starting point; always adapt it to the payer's reconsideration form.
Disclaimer
This page is operational reference for medical-billing professionals. It is not legal, clinical, or contractual advice. X12 code descriptors are maintained by the X12 External Code Lists; always verify against the current X12 release and the payer's own published policy before submitting or appealing a claim.