Avoid rejection of paper claims

When submitting CMS-1500 paper claim forms to Medicare, Item 1 (Type of health insurance) should be marked "Medicare."

As of May 6, 2022, if a claim is marked "Other" and Item 1a (Insured's I.D. Number) contains an invalid Medicare Beneficiary Identifier (MBI), the claim will be rejected as "Invalid MBI."

If your claim is rejected for this reason, please make the necessary corrections and resubmit your claim. If the claim should have gone to another insurance, please correct and send the claim to that insurance carrier.

Learn more about claim guidelines with our interactive CMS-1500 claim form.