CO 190 denial code

Claim adjustment reason code 190. Often reported as CO 190.

Included in qualified SNF stay payment

Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated Nov 11, 2026.

What 190 means

The service is paid as part of the allowance for a qualifying skilled nursing facility stay, so it is not paid separately.

During a qualifying skilled nursing facility stay, many services are covered by the facility's payment for the stay. This code means the payer counted your service as part of that payment.

Outside providers often need to bill the facility instead of the payer. Check whether the service is excluded from the stay bundle.

Group codes seen with 190

On a remittance, 190 comes after a group code. These are the ones it is most often reported with:

• CO 190 (Contractual Obligation): The provider's side of the ledger. The reduction comes from the payer contract or a rule the provider has to follow, and the patient normally cannot be billed for it.

The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.

Common causes

• The patient was in a qualifying SNF stay on the date of service.
• The service is included in the SNF payment rather than billed separately.
• The provider was not aware the patient was in a SNF stay.

What to do next

1. Confirm the patient's SNF stay dates with the facility or the payer.
2. Bill the facility for the service under your arrangement if it is included in the stay.
3. Appeal if the service is excluded from the SNF bundle and payable separately.

Related codes

• 97 (reason code) Service included in another payment
• 135 (reason code) Interim bill cannot be processed