Services not from a network or primary care provider
The patient's plan requires in-network or primary care providers, and this provider is out of network or not the assigned primary care provider.
CO = Contractual Obligation. The provider owes the difference. The patient cannot be billed for this amount. The same reason code can appear with a different group code; the group decides who may be billed.
Usual causes
- HMO or narrow network plan and the provider is not in that specific network.
- Patient assigned to a different primary care provider.
- Provider in network under one product but not the one the patient has.
The fix
Check network status for the exact product. If you are in network, appeal with the contract and effective date. If out of network, bill the patient according to plan rules (emergency care and surprise billing protections may limit what you can bill), and ask about a single-case agreement for continued care.
Appeal or corrected claim?
Appeal with contract proof when in network; otherwise patient responsibility within the law's limits.
Deadline to watch
Appeal window per payer.
Exact limits are in your payer contract or provider manual. When in doubt, send the correction or appeal this week.
CO-242 in short
What does CO-242 mean?
The patient's plan requires in-network or primary care providers, and this provider is out of network or not the assigned primary care provider. The official X12 text reads: "Services not provided by network/primary care providers."
What usually causes a CO-242 denial?
HMO or narrow network plan and the provider is not in that specific network. Patient assigned to a different primary care provider. Provider in network under one product but not the one the patient has.
How do I fix CO-242?
Check network status for the exact product. If you are in network, appeal with the contract and effective date. If out of network, bill the patient according to plan rules (emergency care and surprise billing protections may limit what you can bill), and ask about a single-case agreement for continued care.
Should I appeal CO-242 or send a corrected claim?
Correct or appeal (see note). Appeal with contract proof when in network; otherwise patient responsibility within the law's limits.
What deadline applies to CO-242?
Appeal window per payer.