MA08 remark code

Remittance advice remark code MA08. Remark codes add detail to the reason code on the same claim line.

Alert: bill the other insurer yourself

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 MA08 means

An informational alert that the claim was not sent on to the patient's other insurer, so you should submit it there.

This Medicare remark says the patient may have supplemental coverage, but the claim was not passed along automatically. That usually happens because the coverage is not a Medigap plan or the provider does not participate.

It is an alert, not a denial. Any balance the patient's other insurance might cover needs to be billed by you.

Common causes

• The patient's supplemental coverage is not a plan that receives automatic crossover claims.
• The provider does not participate, so crossover is not offered.
• The other insurer is not set up for crossover.

What to do next

1. Check the patient's secondary coverage details in your system.
2. Submit the claim to the other insurer with the primary remittance information.
3. Do not wait for an automatic crossover that will not happen.

Related codes

• MA18 (remark code) Alert: forwarded to supplemental insurer
• MA07 (remark code) Alert: claim forwarded to Medicaid
• MA04 (remark code) Primary payer information needed