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Medicare CBSA Codes Database

Medicare CBSA (Core-Based Statistical Areas) Codes are used to accurately file Medicare claims and verify if the Medicare Home Health Rural Add-on incentive applies, based on a patient’s ZIP Code.

cbsa medicare The Patient Protection and Affordable Care Act (PPACA) signed into law in early 2010 gives an additional 3% to payments made for home health services to patients in rural areas. To qualify for this incentive, a patient must live in a rural area indicated by Medicare CBSA Codes used by the Centers for Medicare & Medicaid Services (CMS).

Note: Regular CBSA’s differ from Medicare CBSA’s (CMS CBSA Codes)

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Medicare CBSA (Core-Based Statistical Areas)

This product contains Medicare CBSA Codes, based on county, and assigned per ZIP Code for patient verification. If a ZIP Code crosses multiple counties, our file provides record for each occurrence.

Medicare uses CBSA codes that are not identical to standard CBSA Codes. They may also be know as 'CMS CBSA Codes' Although based on the same database, Medicare CBSA's insert exceptions and nuances regarding rural or smaller towns. Our database carefully implements these differences.

Due to the amount of data, the files are normalized to minimize the amount of duplicate information. The following files are included:
med-cbsa-list-fullContains CBSA code, CBSA Name, CBSA Type (‘Metro’ or ‘Micro’). Note: Medicare uses the Division code when a CBSA is part of a Division, therefore we include Division Codes and their Names anytime a CBSA is part of a Division. Example, rather than including 42660 for Seattle-Tacoma-Bellevue, our file will contain two records: 42644 (Seattle-Bellevue-Everett) and 45104 (Tacoma).
med-zip-cbsa-fullThis file has one record for every ZIP Code and the corresponding CBSA / Division codes for that ZIP. Note: rural areas will have ‘999’ followed by a 2-digit Medicare state code (not the same as the FIPS code). Other fields include: State Abbreviation, State FIPs, City, County, and County FIPs. Military APO/FPO records, U.S. Virgin Islands and territories in the South Pacific are not included.
state-medicareThis is a master list of the 2-digit Medicare state code (not the same as the FIPS state code), standards USPS State Abbreviation, and State Name

Learn more: view the CBSA Medicare Product Documentation / Watch our Accuracy Matters video

Database Sources

We are licensees of USPS database products, but we enhance our CBSA Medicare database based on decades of experience to provide you with the most accurate product available.

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Database Specs & Features


  • Immediate Download

    Download is available immediately upon purchase and for the duration of the annual subscription.

  • Quarterly Updates

    A monthly update of this database is not necessary, so we update our database quarterly and recommend that you download quarterly as well.

  • Free FTP (upon request)

    To update your database without human intervention, we can provide you will your own FTP site that you can write a script to access. Just request it after purchase.

  • Data Format - CSV

    Comma-Separated Values (CSV) Text File


  • ZIP Code

    Official U.S. Postal Service five digit ZIP Code

  • City

    Official city name used by the U.S. Postal Service

  • State Abbr.

    Official U.S. Postal Service State Abbreviation

  • State

    Official State Name

  • State FIPS

    Federal Information Processing Standard (FIPS) 2‐digit state. FIPS codes are not available for all areas (APO, FPO, some U.S. Territories).

  • Medicare State Code

    The state codes used in Medicare databases are Social Security Administration (SSA) codes, which differ from Federal Information Processing Standard codes (FIPS).

  • County

    The name of the county in which the ZIP Code is found.

  • County FIPS

    Federal Information Processing Standard (FIPS) 3‐digit county. FIPS codes are not available for all areas (APO, FPO, some U.S. Territories).

  • CBSA Medicare Code

    (aka CMS CBSA) Geographic location code as defined by the Office of Management and Budget. Note: if the OMB makes a change after CMS has defined their codes, it won't show up until the next fiscal year.

  • CBSA Name

    Geographic location name as defined by the Office of Management and Budget

  • CBSA Type

    A CBSA sub-classification:
    Micro - 10,000 to 50,000 population
    Metro - 50,000 + population

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