Where to Send Medicare Claims by State (2026 Guide)

How Medicare Claims Work (Electronic First)

Submitting Medicare claims effectively and timely is crucial for healthcare providers and beneficiaries. Beginning in 2024 and emphasized further for 2026, electronic submission has become the primary and preferred method for all providers handling Medicare Part B services. The Centers for Medicare & Medicaid Services (CMS) requires that nearly all providers, except for small practices with fewer than 10 full-time employees or unique cases, must send their Medicare claims electronically. This policy shift is designed to improve payment speed, minimize errors, and ensure completeness.

Providers file claims through a Medicare Administrative Contractor (MAC) with jurisdiction over their state or territory. These MACs process both CMS-1500 (healthcare professional/Part B) and UB-04 (institutional/Part A) claim forms, though most outpatient providers handle the former. Submitting claims electronically saves substantial time: clean electronic claims are typically paid within 13 to 14 days, versus up to 29 days for paper claims. Moreover, electronic submission allows providers to benefit from services like Electronic Remittance Advice (ERA) and Electronic Funds Transfer (EFT) for faster and more secure payments.

To start with electronic submissions, providers must enroll in the Electronic Data Interchange (EDI) program through their MAC. Many MACs offer EDI enrollment directly via their portals, and some provide training or support to ensure compliance. Once enrolled, providers usually submit claims through a clearinghouse or direct portal login, depending on their practice’s needs. Direct Data Entry (DDE) systems may also be available. For more on paying Medicare costs, navigate our resource: How Do You Pay Medicare Premiums for Every Plan?.

It is important to note that providers are responsible for submitting claims on behalf of Medicare patients except in rare circumstances. This includes ensuring that all data (such as patient eligibility and provider credentials) is current and accurate in systems like PECOS to avoid disruptions or denials.

When to Mail Paper Claims (Rare Cases)

Paper claims for Medicare are permitted only in specific, limited scenarios as defined by CMS. Most providers are required to file electronically unless they qualify under certain exceptions:

• Providers with fewer than 10 full-time employees
• Roster billing situations (e.g., mass immunizations for flu or COVID-19)
• Claims involving home oxygen billed to Durable Medical Equipment Medicare Administrative Contractors (DME MACs)
• When the provider or supplier is outside the United States
• Beneficiaries submitting claims directly to Medicare (not handled by the provider)
• Medicare secondary payer claims where primary payer information is unavailable
• Rare system outages or authorized waivers by CMS

When eligible to submit on paper, use the red-printed CMS-1500 (02/12) claim form, available from permitted print vendors or directly from the U.S. Government Printing Office. Failure to use the authorized form can result in rejection or delay. It is critical to verify the correct MAC P.O. Box mailing address for your state or jurisdiction prior to submission. Beneficiary-submitted claims should utilize the CMS-1490S form, sent along with an itemized bill, detailed explanation, and supporting documentation to the appropriate MAC claims address for your state.

Instructions are detailed and require attention to avoid errors. For instance, documentation like spent oxygen delivery records or proof of payment may be required. If you have questions about claims related to your Medicare coverage, such as those related to kidney treatments, review Medicare Coverage for Dialysis: What Patients Need to Know for additional guidance.

State-by-State Medicare Claims Addresses

Correct routing of paper Medicare Part B claims hinges on your state’s assigned MAC. Ensuring you send your CMS-1500 form to the right address reduces processing time and rejection risk. For Durable Medical Equipment (DME) claims, special addresses may apply-always verify directly with your MAC for current information, as addresses and jurisdictions can change for the 2026 update.

Below is a comprehensive, refreshed 2026 listing for common states and territories. This table is optimized for both compliance and scannability, ensuring audit-ready submissions. Refer to the jurisdiction column for clarity on your MAC contact:

Important: Addresses for durable medical equipment (DMEPOS) and priority submissions may be different, for example, some DME claims for Northeast states use Noridian’s “JA” P.O. Box 6780, Fargo, ND. Always verify through your MAC website or provider portal prior to submission. State/region-specific routing helps minimize errors and ensure compliance.

If you are looking for more detailed cost and coverage information for prescription drug plans by state, especially for Texas, visit our page on Medicare Part D Plans Texas: 2025-2026 Costs and Coverage.

Tips to Avoid Rejections

• Always verify Medicare eligibility through your MAC’s provider tools before file submission to ensure the patient qualifies for services billed.
• When using the CMS-1500 paper form, complete every required field. Missing signatures, dates, or codes can lead to denial or return for correction.
• For electronic claims, enroll in EDI through your MAC and use a tested, certified clearinghouse or vendor. Some MACs support direct upload or DDE systems if a third party is not used.
• Attach supporting documentation for services requiring Local Coverage Determination (LCD) evidence (e.g., certain DME or advanced imaging). Failure to provide invoices or supplemental info is a leading denial reason.
• Ensure correct MAC jurisdiction and payer order (Medicare primary, unless another insured plan pays first). Incorrect payer order is a frequent error for secondary claims.
• Stay up to date on 2026 changes for any address or policy updates to avoid submission to an outdated P.O. Box or using obsolete forms.

For insight into how Medicare integrates with other insurance types and for general premium payment info, explore How Do You Pay Medicare Premiums for Every Plan?.

Alternatives & Resources

• Switch to electronic claims submission whenever possible-2026 CMS rules encourage and, for most, require EDI enrollment for streamlined processing. MAC provider portals (e.g., Noridian, Novitas) offer step-by-step help for setup.
• Check claim statuses via your MAC’s secure portal or by calling 1-800-MEDICARE. Many portals allow you to see real-time claim edits or payment status updates to troubleshoot submissions.
• Refer to official MAC websites-including Noridian, Novitas, CGS Administrators, Palmetto GBA-for continually updated address lists, state/jurisdiction maps, compliance requirements, and direct lookup tools for determining your correct MAC.
• Access foundational CMS publications like the Claims Processing Manual Chapter 24 for billing rules, as well as the Medicare & You 2026 handbook for general beneficiary questions.
• Stay aware of 2026 changes impacting claim edits, address updates, or routing-particularly if you are submitting for DMEPOS suppliers or handling claims involving Medicare Advantage plans, which often follow separate rules for claim submission. Check this resource for when beneficiaries can make Part D plan changes: When Can You Change Your Medicare Part D Plan?.
• If your claim relates to products like medical alert systems, you should research which items are covered and how to submit those claims at What Medical Alert Systems Are Covered by Medicare?.

Be proactive: periodically check the address and policy updates on your MAC’s website, especially each December/January as many jurisdiction changes align with the calendar year.