Every U.S. state is assigned to a Medicare Administrative Contractor (MAC) that processes claims for traditional Medicare Part A and Part B. Knowing your MAC is essential for understanding LCDs, audit procedures, and where to file appeals. Use the lookup below — built by AMS Solutions’ medical billing team.
Why your MAC matters for medical billing
Your MAC controls more than just claim processing. Each MAC issues its own Local Coverage Determinations (LCDs) — the rules that determine whether Medicare covers a specific procedure in your jurisdiction. The same CPT code can be reimbursed in Texas (Novitas) and denied in Florida (First Coast) based on differing LCD policy.
Your MAC also runs Targeted Probe and Educate (TPE) audits in your region, sets the appeals timeline, and publishes the Medicare physician fee schedule for your locale. If your practice serves patients in multiple states, you may interact with multiple MACs.
The 8 Medicare Administrative Contractors
- Novitas Solutions — Texas, NM, OK, AR, LA, MS, CO, DE, MD, NJ, PA, DC, KS, MO, MT (largest by states)
- National Government Services (NGS) — NY, NJ (Part A), CT, ME, MA, NH, RI, VT, IL, WI, MN
- Palmetto GBA — AL, GA, NC, SC, TN, VA, WV
- First Coast Service Options — Florida, Puerto Rico, U.S. Virgin Islands
- Wisconsin Physicians Service (WPS) — IA, KS, MO, NE, IL, IN, MI
- Noridian Healthcare Solutions — CA, NV, HI, AZ, AK, ID, MT, ND, OR, SD, UT, WA, WY
- CGS Administrators — KY, OH
- Cahaba (sunset, claims now with Palmetto)
Need help working with your MAC?
AMS Solutions has handled Medicare billing across all 8 MACs since 1992. Our coders are AAPC-certified. Call 866-973-2221 or book a 30-minute review.
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