Submitting Medicare Part B claims by mail is still an option for certain providers and situations, but there is no single universal mailing address. The correct address depends on your location, whether you are a professional provider or a supplier, and the type of claim. This article explains how to determine the right mailing address, how to prepare paper Part B claims, and how to understand your submission options.
Where To Mail Medicare Part B Paper Claims
Medicare Part B paper claims are sent to the Medicare Administrative Contractor (MAC) that serves your geographic region. The MAC handles claims processing for all Part B services in its area. Because MAC boundaries vary by state and service type, the exact mailing address is not the same for every provider. To avoid delays, verify the correct address before mailing a claim. The best sources are the official CMS and MAC websites, or the Medicare contact center. If you are unsure, call 1-800-MEDICARE for guidance on the appropriate MAC and mailing address for your practice.
How To Find The Correct MAC Address
Follow these steps to locate the right mailing address quickly:
- Identify your claim type: professional/physician claims, facility claims, durable medical equipment (DME), or other services.
- Determine your state and region, as MAC coverage varies by geography.
- Visit the official CMS “Medicare Claim Submission by Mail” page or the MAC’s website to find the exact mailing address, accumulation rules, and form requirements.
- If you cannot locate the address online, contact 1-800-MEDICARE or your MAC’s customer support for the precise mailing address and any special filing instructions.
- Double-check that you are using the correct CMS form (for example CMS-1500 for professional services) and that the form is fully completed and signed where required.
Common Paper Claim Scenarios
Several common situations may require mailing a Part B claim rather than electronic submission:
- Providers without available or compatible electronic submission systems.
- Certain unusual or non-standard claims that cannot be submitted electronically.
- New provider enrollment or billing scenarios where interim paper submissions are permitted.
- Backlog or temporary outages affecting electronic claims processing, during which paper submissions are accepted with extended processing timelines.
In all cases, ensure that the claim includes all required information: patient details, provider identifiers (NPI, tax ID), dates of service, diagnosis codes, CPT/HCPCS codes, charges, modifiers if needed, and patient consent or assignment documentation when applicable. Incomplete or incorrect claims can be returned or delayed.
What To Include With Your Paper Claim
To minimize processing delays, prepare the following materials for mailing with each Part B claim:
- The appropriate CMS-1500 (02/12) or current version form, filled out accurately.
- Itemized itemization of services, with eligibility and payer information clearly displayed.
- Correct diagnosis codes (ICD-10-CM) and procedure codes (CPT/HCPCS) with dates of service.
- Signature on file or assignment of benefits, if required by your practice policy.
- Supporting documentation such as referrals, medical necessity notes, or prior authorization if requested.
- A cover letter with provider name, address, contact information, and a note stating the claim type and the MAC region.
Tips For Faster Processing
Speed up processing and reduce the chance of denial by following these best practices:
- Use the latest claim forms and print clearly to avoid interpretation errors.
- Attach all required documentation; missing items are a common source of delays.
- Double-check patient identifiers and payer details to ensure correct routing.
- Keep copies of every submitted item for your records and for audit readiness.
- Track claims through your practice management system and request receipts or confirmations when available.
Electronic Claims As an Alternative
Electronic submission is the preferred method for most Part B claims due to faster processing, fewer losses, and easier tracking. Many providers use electronic claim submission to the MAC or through a clearinghouse. If you are able to file electronically, it often results in quicker adjudication and fewer errors compared to paper filing. The Medicare program and many MACs encourage electronic submission as the standard practice, and electronic systems can automatically apply edits and alert you to missing data before the claim is sent.
Key takeaway: There is no universal mailing address for Medicare Part B claims. The correct address is MAC-specific and region-specific. Always verify the correct mailing address and filing instructions through official CMS resources or by contacting 1-800-MEDICARE before mailing any paper claims.