William Mullen, MD

Primary specialty

Cardiovascular Disease PhysicianTaxonomy code 207RC0000X

License

A43317 Issued in CA

Practice address

2441 Mission College Blvd
Santa Clara, CA 95054-1214

Phone

(800) 478-8837

NPI assigned

Aug 10, 2006

Sex

Male

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other identifiers 1

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in CA

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

Cardiovascular Disease (Cardiology)Also: Internal Medicine

Education

Tulane University School of Medicine, 1984

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

Sutter Bay Medical FoundationGroup PAC ID 4284538778, shared by 16 NPIs, 3,783 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

81.82 of 100Reported as group

Quality

67.1

Promoting interoperability

98

Improvement activities

40

Cost

73.98

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: wmullen9103@hisp.ehr.sutterhealth.org

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

• Sutter Bay Medical Foundation

  dba Sutter Samaritan Surgery Center

  • Ambulatory Surgical Clinic/Center
  • San Jose, CA
  • NPI 1033817168
  Medicare reassignment NPD
• Sutter Bay Medical Foundation

  dba Palo Alto Medical Foundation

  • Ambulatory Surgical Clinic/Center
  • Palo Alto, CA
  • NPI 1104067115
  Medicare reassignment NPD
• Sutter Bay Medical Foundation

  • Ambulatory Surgical Clinic/Center
  • Fremont, CA
  • NPI 1497996524
  Medicare reassignment NPD
• Sutter Bay Medical Foundation

  • Ambulatory Surgical Clinic/Center
  • Los Altos, CA
  • NPI 1568851327
  Medicare reassignment NPD
• Sutter Bay Medical Foundation

  • Ambulatory Surgical Clinic/Center
  • Mountain View, CA
  • NPI 1982845186
  Medicare reassignment NPD
• Sutter Bay Medical Foundation

  dba Palo Alto Medial Foundation

  • Multi-Specialty Clinic/Center
  • Palo Alto, CA
  • NPI 1013950807
  Medicare reassignment
• Hu and Mullen Medical Corporation

  • Specialist
  • Los Altos, CA
  • NPI 1932277209

  Cardiovascular Disease

  NPD
• Sutter Bay Medical Foundation

  dba Sutter Pacific Medical Foundation

  • Multi-Specialty Clinic/Center
  • Sacramento, CA
  • NPI 1003267196

  Cardiovascular Disease

  NPD
• Sutter Bay Medical Foundation

  • Ambulatory Surgical Clinic/Center
  • San Carlos, CA
  • NPI 1164840088
  NPD
• Sutter Bay Medical Foundation

  • Ambulatory Surgical Clinic/Center
  • Fremont, CA
  • NPI 1306241534
  NPD
• Sutter East Bay Medical Foundation

  • Family Medicine Physician
  • Orinda, CA
  • NPI 1871538769

  Cardiovascular Disease

  NPD (past)

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

{
    "created_epoch": "1155168000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761091200000",
    "number": "1457362329",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 276950",
            "city": "SACRAMENTO",
            "state": "CA",
            "postal_code": "958276950"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "2441 MISSION COLLEGE BLVD",
            "city": "SANTA CLARA",
            "state": "CA",
            "postal_code": "950541214",
            "telephone_number": "800-478-8837"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MULLEN",
        "first_name": "WILLIAM",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-08-10",
        "last_updated": "2025-10-22",
        "certification_date": "2025-10-22",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "CA",
            "license": "A43317",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "145965100",
            "state": "WY"
        }
    ],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "wmullen@sjmc.cernerdirect.com",
            "affiliation": "N",
            "endpointDescription": "Direct Messaging Address for St John's Health",
            "use": "DIRECT",
            "useDescription": "Direct",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "Other",
            "address_1": "555 E Broadway Ave Ste 229",
            "city": "Jackson",
            "state": "WY",
            "country_code": "US",
            "postal_code": "83001",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Richard Grant Muir, M.A.
• Aaditi Mujumdar, DDS
• Manjari M. Mukherjee, MD
• Samantha Mulhern
• Mullen PT
• Aida Muller, LMFT
• Maneek Mundi
• Jonah Paul Bilovsky Muniz, M.D.
• Norma Yadira Muniz, LCSW
• Laiza Idali Munoz-Aguilar

• Cardiovascular Disease Physician in Santa Clara, CA
• Providers in Santa Clara, CA by specialty
• Cardiovascular Disease Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Oct 22, 2025; 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.