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Submitting the form CMS-838. Submit a completed CMS-838 to your fiscal intermediary (FI) within 30 days after the close of each calendar quarter. Include in the report all Medicare credit balances shown in your accounting records (including transfer, holding or.
Check the  Medicare Summary Notice  (MSN) you get in the mail every 3 months, or login to MyMedicare.gov to make sure claims are being filed timely. If the claims aren't being filed timely: 1  Contact your doctor or supplier, and ask them to file a claim.2  If they don't file a claim, call 1-800-MEDICARE.3  Ask for the exact time limit for filing a Medicare claim for the service or supply you got.f the claims aren't being filed timely: 1  Contact your doctor or supplier, and ask them to file a claim. 2  If they don't file a claim, call 1-800-MEDICARE. 3  Ask for the exact time limit for filing a Medicare claim for the service or supply you got.