Swaminadhan Gnanashanmugam, M.D.

Primary specialty

Thoracic Surgery (Cardiothoracic Vascular Surgery) PhysicianTaxonomy code 208G00000X

License

A171765 Issued in CA

Practice address

10 Woodland Rd
Saint Helena, CA 94574-9554

Phone

(650) 804-8093

NPI assigned

Oct 15, 2008

Last updated

Nov 11, 2025By 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

Other identifiers 2

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in IL, CA, FL3 enrollments

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 3

Specialty

Thoracic SurgeryAlso: Cardiac Surgery

Education

Northwestern University Feinberg Medical School, 2008

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Adventist Health Physicians NetworkGroup PAC ID 3274580972, 628 clinicians

Providence Medical FoundationGroup PAC ID 8921993205, 1,461 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Providence Santa Rosa Memorial Hospital Hospital, Santa Rosa, CA, CCN 050174
• Adventist Health St Helena Hospital, Saint Helena, CA, CCN 050013
• Providence St Joseph Hospital Hospital, Eureka, CA, CCN 050006
• Adventist Health and Rideout Hospital, Marysville, CA, CCN 050133

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: sgnanashanmugam796448@direct.memorialcare.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.

• Adventist Health Physicians Network

  • Multi-Specialty Clinic/Center
  • Hanford, CA
  • NPI 1063718583
  Medicare reassignment Care Compare group NPD
• Providence Medical Foundation

  • Family Medicine Physician
  • Brea, CA
  • NPI 1871607762
  Medicare reassignment Care Compare group
• Memorialcare Medical Foundation

  • Clinic/Center
  • Fountain Valley, CA
  • NPI 1205167350
  Medicare reassignment NPD
• St. Helena Hospital

  dba Adventist Health St. Helena

  • General Acute Care Hospital
  • Saint Helena, CA
  • NPI 1720078082
  Medicare reassignment NPD
• Health First Medical Group, LLC

  • General Practice Physician
  • Melbourne, FL
  • NPI 1750626495

  Surgery

  Medicare reassignment NPD
• Northwestern Medical Faculty Foundation

  dba Northwestern Medical Group

  • Multi-Specialty Clinic/Center
  • Carol Stream, IL
  • NPI 1346235314
  Medicare reassignment NPD
• Adventist Health Physicians Network

  • Physical Therapy Clinic/Center
  • Paradise, CA
  • NPI 1134092190
  NPD
• Adventist Health Physicians Network

  • Orthopaedic Surgery Physician
  • Yuba City, CA
  • NPI 1700384708
  NPD
• Providence Medical Foundation

  • Urology Physician
  • Apple Valley, CA
  • NPI 1053616706
  NPD
• Providence Medical Foundation

  • General Practice Physician
  • Diamond Bar, CA
  • NPI 1285890624
  NPD
• Providence Medical Foundation

  • Family Medicine Physician
  • Anaheim, CA
  • NPI 1639715709
  NPD
• St. Helena Hospital

  dba Adventist Health Vallejo

  • Psychiatric Hospital
  • Vallejo, CA
  • NPI 1851381990
  NPD

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

• Rideout Memorial Hospital

  dba Adventist Health and Rideout

  • General Acute Care Hospital
  • Marysville, CA
  • NPI 1720088354
  Care Compare affiliation
• St. Helena Hospital

  dba Adventist Health St. Helena

  • General Acute Care Hospital
  • Saint Helena, CA
  • NPI 1720078082
  Care Compare affiliation
• St. Joseph Health Northern California, LLC

  dba Providence Santa Rosa Memorial Hospital

  • General Acute Care Hospital
  • Santa Rosa, CA
  • NPI 1134152549
  Care Compare affiliation
• St. Joseph Health Northern California, LLC

  dba Providence Humboldt Home Infusion

  • Home Infusion Therapy Pharmacy
  • Eureka, CA
  • NPI 1568422319

  Hospital

  Care Compare affiliation
• St. Joseph Health Northern California, LLC

  dba Providence St. Joseph Hospital

  • General Acute Care Hospital
  • Eureka, CA
  • NPI 1609858950
  Care Compare affiliation
• St. Joseph Health Northern California, LLC

  dba Providence St. Joseph Hospital

  • General Acute Care Hospital
  • Eureka, CA
  • NPI 1891900635
  Care Compare affiliation

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

{
    "created_epoch": "1224028800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1762819200000",
    "number": "1073765517",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5082 DUPONT DR",
            "city": "SANTA ROSA",
            "state": "CA",
            "postal_code": "954093743",
            "telephone_number": "650-804-8093",
            "fax_number": "650-804-8093"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "10 WOODLAND RD",
            "city": "SAINT HELENA",
            "state": "CA",
            "postal_code": "945749554",
            "telephone_number": "650-804-8093"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "17360 Brookhurst Street",
            "address_purpose": "LOCATION",
            "city": "Fountain Valley",
            "state": "CA",
            "postal_code": "927083720",
            "country_code": "US",
            "telephone_number": "714-665-1797",
            "fax_number": "714-665-4680",
            "country_name": "United States",
            "address_type": "DOM"
        },
        {
            "address_1": "1350 Hickory St",
            "address_purpose": "LOCATION",
            "city": "Melbourne",
            "state": "FL",
            "postal_code": "329013224",
            "country_code": "US",
            "telephone_number": "321-434-3455",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "GNANASHANMUGAM",
        "first_name": "SWAMINADHAN",
        "name_prefix": "Dr.",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2008-10-15",
        "last_updated": "2025-11-11",
        "certification_date": "2025-11-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208G00000X",
            "taxonomy_group": "",
            "desc": "Thoracic Surgery (Cardiothoracic Vascular Surgery)",
            "state": "IL",
            "license": "036157660",
            "primary": false
        },
        {
            "code": "208G00000X",
            "taxonomy_group": "",
            "desc": "Thoracic Surgery (Cardiothoracic Vascular Surgery)",
            "state": "FL",
            "license": "ME173914",
            "primary": false
        },
        {
            "code": "208G00000X",
            "taxonomy_group": "",
            "desc": "Thoracic Surgery (Cardiothoracic Vascular Surgery)",
            "state": "CA",
            "license": "A171765",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "128981100",
            "state": "FL"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "HFMG",
            "identifier": "WF482",
            "state": "FL"
        }
    ],
    "endpoints": [
        {
            "endpointType": "FHIR",
            "endpointTypeDescription": "FHIR URL",
            "endpoint": "https://memorialcare.org/fhir/api/FHIR/R4/",
            "affiliation": "Y",
            "endpointDescription": "MemorialCare FHIR Endpoint",
            "affiliationName": "MemorialCare Medical Foundation",
            "use": "HIE",
            "useDescription": "Health Information Exchange (HIE)",
            "contentType": "OTHER",
            "contentTypeDescription": "Other",
            "contentOtherDescription": "FHIR",
            "address_1": "17360 Brookhurst St",
            "city": "Fountain Valley",
            "state": "CA",
            "country_code": "US",
            "postal_code": "927083720",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": []
}

• Shawn Fronterhouse, PA-C
• Susan Rebecca Gamble, M.D.
• Shawn Garrity
• Deborah Geary, MD
• Tami S Glenn, CRNA
• Melissa Ann Gold, PH.D.
• Jaime Jose Gonzalez Cardona, MD
• Sarah Alexiah Gonzalez
• Leah M Grabenauer, MD
• Stephen R Greenberg, MD

• Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in Saint Helena, CA
• Providers in Saint Helena, CA by specialty
• Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Nov 11, 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.