Contractual

Denial code CO-242: Services not provided by network providers

The rendering provider was out of network for this plan, so the service was denied or reduced under the network benefit.

Reason code

CARC 242

Typical group code

What CO-242 actually means

The payer processed the claim against out-of-network rules — or refused it outright where the plan has no out-of-network benefit. This is often a credentialing timing issue rather than a genuine network decision: a provider whose credentialing has not completed, or whose participation was never loaded for the specific plan, is treated as out of network even inside a participating group.

Why this denial happens

The provider is genuinely out of network for the plan.
Credentialing is pending or was completed after the date of service.
The provider participates with the payer but not with this specific plan or product line.
The claim was billed under an individual NPI that is not linked to the participating group.

How to resolve a CO-242 denial

Confirm the provider’s participation status for that specific plan and date of service.
Appeal with the effective date where credentialing was retroactive to before the service.
Verify the claim carried the correct group and individual NPI combination.
Where the provider was genuinely out of network, apply the out-of-network benefit and the patient’s correct liability.

How to prevent it

Track credentialing effective dates and hold claims for new providers until participation loads.
Confirm participation by plan and product line, not just by payer name.

Frequently asked

What does denial code CO-242 mean?

The rendering provider was out of network for this plan, so the service was denied or reduced under the network benefit. The X12 description reads: "Services not provided by network/primary care providers."

How do I fix a CO-242 denial?

Confirm the provider’s participation status for that specific plan and date of service. Appeal with the effective date where credentialing was retroactive to before the service. Verify the claim carried the correct group and individual NPI combination. Where the provider was genuinely out of network, apply the out-of-network benefit and the patient’s correct liability.

Can CO-242 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

CO-8 · Procedure inconsistent with provider type / specialty CO-45 · Charge exceeds fee schedule / maximum allowable CO-170 · Payment denied for this provider type CO-B7 · Provider not certified or eligible for this service

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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.