Medicare Enrolled

Dr. Swaminadhan Gnanashanmugam, M.D.

Thoracic Surgery · Saint Helena, CA
Practice pattern: Interventional & Cardiac — Practice combining interventional and cardiac services
Low-engagement
10 WOODLAND RD, Saint Helena, CA 94574
6508048093
In practice since 2008 (17 years)
NPI: 1073765517 verify on NPPES ↗
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating. This page presents federal public records about Dr. Gnanashanmugam from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Gnanashanmugam

Dr. Swaminadhan Gnanashanmugam is a thoracic surgery specialist in Saint Helena, CA, with 17 years of NPI registration. Based on federal Medicare data, Dr. Gnanashanmugam performed 127 Medicare services across 119 unique beneficiaries.

Between the years covered by Open Payments, Dr. Gnanashanmugam received a total of $22,632 from 18 pharmaceutical and/or device companies across 226 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in thoracic surgery. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.

The Data Coverage level for Dr. Gnanashanmugam is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.

✓ 17 years in practice ▲ 127 Medicare services $22,632 industry payments

Medicare Practice Summary

Medicare Utilization ↗
127
Medicare services
Bottom 42% in CA for thoracic surgery
119
Unique beneficiaries
$346
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~7 Medicare services per year of practice

Top procedures by volume

Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.

Procedure Volume Avg. paid Avg. submitted
Transcatheter aortic valve replacement via femoral artery
A minimally invasive procedure to replace a diseased aortic heart valve using a catheter inserted through the skin and femoral artery.
 62 $641 $8,269
Hospital follow-up visit, low complexity
Follow-up hospital visit for an established patient with straightforward or low-level medical decision making. The visit requires at least 25 minutes of time spent on the day of service.
 48 $40 $119
New patient office visit (45-59 min)
An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter.
 17 $135 $505
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
48.8% high complexity
0.0% medium
51.2% routine

Industry Payment Transparency

Open Payments through 2024 ↗
$22,632
Total received (2018-2024)
Avg $3,233/year across 7 years
Top 18% in CA for thoracic surgery
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
18
Companies
226
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →

Payment profile

Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.

Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$22,364 (98.8%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$268 (1.2%)

Payment trend by year

Annual totals from pharmaceutical and medical device companies.

2024
$2,018
2023
$4,137
2022
$3,392
2021
$4,885
2020
$2,099
2019
$3,840
2018
$2,261

Payments by company (2024)

Consulting
Speaking
Meals & Travel
Research
Medtronic, Inc.
$665
Edwards Lifesciences Corporation
$550
ATRICURE, INC.
$312
W. L. Gore & Associates, Inc.
$268
Abbott Laboratories
$195
ABIOMED
$28
Top 3 companies account for 75.7% of 2024 payments
All-time payments by company (2018-2024) ›
ATRICURE, INC.
$5,358
Abbott Laboratories
$5,017
Edwards Lifesciences Corporation
$4,133
Medtronic, Inc.
$3,270
Intuitive Surgical, Inc.
$1,250
W. L. Gore & Associates, Inc.
$1,014
AtriCure, Inc.
$1,005
Medtronic Vascular, Inc.
$589
LivaNova USA, Inc.
$160
Biom'Up France SAS
$151
ABIOMED
$145
HeartFlow, Inc.
$141
BAXTER HEALTHCARE
$125
AstraZeneca Pharmaceuticals LP
$119
Covidien LP
$47
Amgen Inc.
$46
Terumo Medical Corporation
$43
KLS-Martin L.P.
$18
Top 3 companies account for 64.1% of all-time payments
Associated products mentioned in payments ›
3F · ATRICLIP LAA EXCLUSION SYSTEM · ATRICURE ATRICLIP LAA EXCLUSION · ATRICURE CRYOICE CRYOABLATION SYSTEM (CRYO2) · ATRICURE CRYOICE CRYOSPHERE CRYOABLATION SYSTEM · ATRICURE SYNERGY ABLATION SYSTEM · Aortic and Mitral Tissue Stented Valves · COREVALVE EVOLUT R · CRM-Research only · CardioMEMS HF System · Carpentier-Edwards PERIMOUNT Magna Ease Pericardial Aortic Bioprosthesis · Carpentier-Edwards Physio II Annuloplasty Ring · CoreValve Evolut · Corlanor · Da Vinci Surgical System · EDWARDS INTUITY Elite valve system · ENDURANT IIS · EPI-SENSE GUIDED COAGULATION SYSTEM WITH VISITRAX · Edwards SAPIEN 3 Transcatheter Heart Valve · Edwards SAPIEN 3 Ultra Transcatheter Heart Valve · Epic Stented Tissue Valve · FFRct · FLOSEAL · GLIDEWIRE · GORE TAG Thoracic Branch Endoprosthesis · HEMOBLAST BELLOWS · HeartMate · HeartMate 3 Left Ventricular Assist Device · HeartMate 3 Left Ventricular Dev · HeartWare HVAD · INSPIRIS RESILIA AORTIC VALVE · INSPIRIS RESILIA aortic valve · Impella · MITRACLIP · MITRIS RESILIA Mitral Valve · Mitra Clip system · MitraClip System · Perceval · Repatha · SAPIEN 3 Ultra RESILIA · SYNERGY ABLATION SYSTEM · TAG Thoracic Endoprosthesis · TAGRISSO · Trifecta GT Tissue Heart Valve · VALIANT CAPTIVIA · iDrive
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →

Most payments (99%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.

Looking for a thoracic surgery specialist in Saint Helena?
Compare thoracic surgerists in the Saint Helena area by procedure volume, costs, and industry payment transparency.
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Geographic Context

Thoracic surgerists within 10 mi
11
Per 100K population
8.1
County median income
$108,970
Nearest hospital
ADVENTIST HEALTH ST HELENA
0.0 mi

Data Sources

Provider Registry ✓ NPPES Weekly updates
Medicare Enrollment ✓ PECOS Monthly updates
Practice Data ✓ Medicare Util. Annual (CY lag)
Industry Payments ✓ Open Payments CY 2024
Disciplinary History — Not public N/A

This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →

Summary

Dr. Gnanashanmugam is an interventional & cardiac specialist, with moderate Medicare volume, with low-engagement industry engagement in the top 18% of CA peers, with 17 years of NPI registration.

This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →

Frequently Asked Questions

Is Dr. Gnanashanmugam experienced with transcatheter aortic valve replacement via femoral artery?
Based on Medicare claims data, Dr. Gnanashanmugam performed 62 transcatheter aortic valve replacement via femoral artery services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Gnanashanmugam receive payments from pharmaceutical companies?
Yes. Dr. Gnanashanmugam received a total of $22,632 from 18 companies across 226 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Gnanashanmugam's costs compare to other thoracic surgerists in Saint Helena?
Dr. Gnanashanmugam's average Medicare payment per service is $346. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Gnanashanmugam) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →

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About this page

All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.

This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.

Provider corrections: Provider portal · Privacy questions: Privacy Policy · Terms: Terms of Use · Methodology: Methodology

Data Disclaimer — Data sourced from the Centers for Medicare & Medicaid Services (CMS): National Plan and Provider Enumeration System (NPPES), Open Payments program, Medicare Provider Utilization and Payment Data, and Provider Enrollment & Certification data (PECOS). Published under the Freedom of Information Act (FOIA). This website is not affiliated with, endorsed by, or authorized by CMS, HHS, or the U.S. Government. Data may contain errors as reported to CMS by providers and reporting entities. Payments from industry are legal and do not indicate wrongdoing. Medicare data reflects only patients aged 65+ or those with qualifying disabilities. For corrections, contact CMS directly. This information does not constitute medical advice and should not be used as the sole basis for choosing a healthcare provider. Procedure descriptions use plain language and do not reference CPT® codes, which are copyrighted by the American Medical Association. Full methodology → · Report a data error → · Privacy policy →