Maxwell Sumkin Butler, MD

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

85401 Issued in WI

Practice address

2651 Windsor St
Sun Prairie, WI 53590-9825

Phone

(608) 837-2206

NPI assigned

Jun 2, 2022

Last updated

Aug 7, 2026By the provider in NPPES

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Medicare fee-for-service enrollment

Enrolled in WI

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Family Practice

Education

University of Wisconsin School of Medicine, 2022

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

University of Wisconsin Medical Foundation IncGroup PAC ID 6608785464, 2,537 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• University of Wi Hospitals & Clinics Authority Hospital, Madison, WI, CCN 520098

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• University of Wisconsin Medical Foundation, Inc

  • Multi-Specialty Clinic/Center
  • Middleton, WI
  • NPI 1598784555
  Medicare reassignment Care Compare group NPD
• University of Wisconsin Medical Foundation, Inc

  • Health Educator
  • Madison, WI
  • NPI 1487414082
  NPD
• Regents of the University of Michigan

  • Specialty Pharmacy
  • Dexter, MI
  • NPI 1952181919
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• University of Wisconsin Hospitals and Clinics Authority

  dba University of Wisconsin Hospital and Clinics

  • General Acute Care Hospital
  • Madison, WI
  • NPI 1922043744
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1654128000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1786060800000",
    "number": "1326787755",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "7974 UW HEALTH CT",
            "city": "MIDDLETON",
            "state": "WI",
            "postal_code": "535625531"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2651 WINDSOR ST",
            "city": "SUN PRAIRIE",
            "state": "WI",
            "postal_code": "535909825",
            "telephone_number": "608-837-2206"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2402 Winnebago St",
            "address_purpose": "LOCATION",
            "city": "Madison",
            "state": "WI",
            "postal_code": "537045341",
            "country_code": "US",
            "telephone_number": "608-828-7603",
            "fax_number": "608-242-6848",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "600 Highland Ave",
            "address_purpose": "LOCATION",
            "city": "Madison",
            "state": "WI",
            "postal_code": "537920001",
            "country_code": "US",
            "telephone_number": "608-262-2919",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "7102 Mineral Point Rd",
            "address_purpose": "LOCATION",
            "city": "Madison",
            "state": "WI",
            "postal_code": "537171706",
            "country_code": "US",
            "telephone_number": "608-828-7676",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "4602 Eastpark Blvd",
            "address_purpose": "LOCATION",
            "city": "Madison",
            "state": "WI",
            "postal_code": "537182002",
            "country_code": "US",
            "telephone_number": "608-263-6400",
            "fax_number": "608-262-6743",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BUTLER",
        "first_name": "MAXWELL",
        "middle_name": "SUMKIN",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2022-06-02",
        "last_updated": "2026-08-07",
        "certification_date": "2026-08-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "WI",
            "license": "85401",
            "primary": true
        },
        {
            "code": "2084A0401X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Addiction Medicine",
            "state": "WI",
            "license": "85401-20",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Nicole Brown, LPC
• Jacob J. Bryan, M.D.
• Lindsay Buhrow
• Lukas James Burke, PHARMD
• Hailey Butenhoff
• Janet A Buzzell, R.N.
• By by Transportation
• Ann M Byrne, NP,APNP
• Robert L Cadwallader, D.C.
• Habibou Camara

• Family Medicine Physician in Sun Prairie, WI
• Providers in Sun Prairie, WI by specialty
• Family Medicine Physician in Wisconsin

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 7, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.