Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Swaminadhan Gnanashanmugam, MD

Individual provider Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · NPI 1073765517

Dr. Swaminadhan Gnanashanmugam, MD practises Thoracic Surgery in Saint Helena, California. Graduated from Northwestern University Feinberg Medical School in 2008, 18 years ago. Practices with Adventist Health Physicians Network, a 632-clinician group, works from 3 locations and accepts Medicare assignment. Licensed in California, Florida and Illinois.

Years since qualifying
18
Trained at
Northwestern University Feinberg Medical School
Licensed in
CA, FL, IL
In the registry since
2008
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

10 Woodland Rd
Saint Helena, CA 94574-9554
Phone: (650) 804-8093
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Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (2)

  • 17360 Brookhurst Street, Fountain Valley, CA 92708-3720 — (714) 665-1797
  • 1350 Hickory St, Melbourne, FL 32901-3224 — (321) 434-3455

Specialties & licences

Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician (primary) Taxonomy 208G00000X · Licence A171765 (CA)
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Taxonomy 208G00000X · Licence 036157660 (IL)
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician Taxonomy 208G00000X · Licence ME173914 (FL)

Record details

NPI number1073765517
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 15, 2008
Last updated in NPPESNovember 11, 2025
Certification dateNovember 11, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyTHORACIC SURGERY
Also practisesCARDIAC SURGERY
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 2008 (18 years in practice)
Group practice Adventist Health Physicians Network — 632 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Coronary artery bypass graft (CABG) 28 times · 81st percentile
Leg revascularization (restoring blood flow) 1–10 times
Removal of tissue 1–10 times
Upper gastrointestinal (GI) endoscopy for acid reflux 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients117
Services billed 251 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Travel and Lodging $14,814 23 payments · travel or lodging paid or reimbursed, such as to attend a conference
Food and Beverage $1,883 40 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

  • Adventist Health St Helena Hospital · Saint Helena, CA · listed as Adventist Health St Helena OB/GYN
  • Adventist Health And Rideout Hospital · Marysville, CA
  • Providence Santa Rosa Memorial Hospital Hospital · Santa Rosa, CA
  • Providence St Joseph Hospital Hospital · Eureka, CA

Colleagues at Adventist Health Physicians Network

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 632 clinicians in the practice; 12 are shown here.

Other providers in Saint Helena