William D Clark, MD

Primary specialty

Family Medicine PhysicianTaxonomy code 207Q00000X

License

23063 Issued in IA

Practice address

200 Hawkins Dr
Iowa City, IA 52242-1009

Phone

(319) 384-7000

Fax

(319) 384-7822

NPI assigned

Jul 12, 2006

Last updated

Jan 2, 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 3

Addresses

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Eligible to order & refer

• Part B services: No
• Medical equipment: Yes
• Home health: No
• Power mobility devices: Yes
• Hospice: No

Green means eligible to order or refer.

Specialty

Hospice/Palliative CareAlso: Family Practice

Education

University of Iowa, RJ & L Carver College of Medicine, 1977

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Hospital & facility affiliations

• University of Iowa Hospital & Clinics Hospital, Iowa City, IA, CCN 160058

Merit-based Incentive Payment System (MIPS)

Final score

80.02 of 100Reported as group

Quality

75.68

Promoting interoperability

78

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Interoperability endpoints

• Direct secure messaging: wclark59277@uihcdirect.org

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.

• Floyd County Memorial Hospital Commission

  • Critical Access Hospital
  • Charles City, IA
  • NPI 1265402390

  Family Medicine

  NPD (past)
• Mercy Health Services-Iowa Corp

  dba MercyOne Northwood Pharmacy

  • Community/Retail Pharmacy
  • Northwood, IA
  • NPI 1316909484
  NPD (past)
• Primary Health Group Inc

  • Family Medicine Physician
  • Midlothian, VA
  • NPI 1578504452
  NPD (past)

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

• State University of Iowa

  dba University of Iowa Health Care Medical Center

  • General Acute Care Hospital
  • Iowa City, IA
  • NPI 1376544320
  Care Compare affiliation

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

{
    "created_epoch": "1152662400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1767312000000",
    "number": "1083639140",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "660 WALKER CIR",
            "city": "IOWA CITY",
            "state": "IA",
            "postal_code": "522454707"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "200 HAWKINS DR",
            "city": "IOWA CITY",
            "state": "IA",
            "postal_code": "522421009",
            "telephone_number": "319-384-7000",
            "fax_number": "319-384-7822"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "CLARK",
        "first_name": "WILLIAM",
        "middle_name": "D",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-12",
        "last_updated": "2026-01-02",
        "certification_date": "2026-01-02",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "IA",
            "license": "23063",
            "primary": true
        },
        {
            "code": "207Q00000X",
            "taxonomy_group": "",
            "desc": "Family Medicine",
            "state": "IL",
            "license": "23063",
            "primary": false
        },
        {
            "code": "207QH0002X",
            "taxonomy_group": "",
            "desc": "Family Medicine, Hospice and Palliative Medicine",
            "state": "IA",
            "license": "23063",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Steven Heyen Clark, DDS
• Tacie A Clark
• Teresa Joan Clark, RD, LD
• Toniel Clark
• Vicki Lynn Clark, LCSW
• Jennifer Clasen, RD, LD
• Michelle Lee Clasen, PHARMD
• Amaya Clausen
• Jacqueline Alexandra Clauss, MD
• Alexander Dale Claussen, M.D.

• Family Medicine Physician in Iowa City, IA
• Providers in Iowa City, IA by specialty
• Family Medicine Physician in Iowa

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 2, 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.