DR. SWAMINADHAN GNANASHANMUGAM M.D.
NPI 1073765517
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Saint Helena, CA
About Dr. Swaminadhan Gnanashanmugam M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. SWAMINADHAN GNANASHANMUGAM M.D. (NPI 1073765517) is an individual thoracic surgery (cardiothoracic vascular surgery) provider in Saint Helena, California, licensed in California (A171765) and active in the NPI registry since October 2008. He is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of Northwestern University Feinberg Medical School (2008).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Locations 2
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Swaminadhan Gnanashanmugam M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
7Medicare enrollment records show Swaminadhan Gnanashanmugam reassigns Medicare billing to 7 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Saint Helena, CA 94574
- Reassigned Medicare billing, California enrollment
- 678 clinicians in this Medicare group
Saint Helena, CA 94574
- Reassigned Medicare billing, California enrollment
- 128 clinicians in this Medicare group
Santa Rosa, CA 95405
- Reassigned Medicare billing, California enrollment
- 1,699 clinicians in this Medicare group
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 clinicians in this Medicare group
Carol Stream, IL 60122
- Reassigned Medicare billing, Illinois enrollment
- 4,817 clinicians in this Medicare group
Foley, AL 36535
- Reassigned Medicare billing, Florida enrollment
- 446 clinicians in this Medicare group
Melbourne, FL 32901
- Reassigned Medicare billing, Florida enrollment
- 773 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94574 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAINT HELENA, CA 94574
SAINT HELENA, CA 94574
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Swaminadhan Gnanashanmugam's NPI number?
The NPI number for Swaminadhan Gnanashanmugam is 1073765517. It was assigned to this individual provider in the NPPES registry on October 15, 2008.
Where is Swaminadhan Gnanashanmugam located?
Swaminadhan Gnanashanmugam practices at 10 Woodland Rd, Saint Helena, CA 94574. The listed phone number is (650) 804-8093.
What is Swaminadhan Gnanashanmugam's specialty?
The primary specialty registered for this NPI is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.
Is Swaminadhan Gnanashanmugam enrolled in Medicare?
Yes. Swaminadhan Gnanashanmugam is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Swaminadhan Gnanashanmugam's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Swaminadhan Gnanashanmugam reassigns Medicare benefits to 7 organizations: Adventist Health Physicians Network (Saint Helena, CA), St. Helena Hospital (Saint Helena, CA), Providence Medical Foundation (Santa Rosa, CA), Memorialcare Medical Foundation (Fountain Valley, CA), Northwestern Medical Faculty Foundation (Carol Stream, IL) and 2 more organizations, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Swaminadhan Gnanashanmugam's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Swaminadhan Gnanashanmugam accept?
Health plans from Ambetter Health, Ambetter of Alabama, Florida Blue (BlueCross BlueShield FL), Florida Blue HMO (a BlueCross BlueShield FL company) and Health First Commercial Plans, Inc. and 1 other insurer list Swaminadhan Gnanashanmugam as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Swaminadhan Gnanashanmugam was last updated on November 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Swaminadhan Gnanashanmugam, M.D. · NPI 1073765517
Thoracic Surgery (Cardiothoracic Vascular Surgery) physician in Saint Helena, California. Individual provider, active in the CMS NPPES registry since October 15, 2008.
## Identity
- **NPI:** 1073765517 (Entity type: Individual)
- **Enumerated:** October 15, 2008
- **Primary specialty:** Thoracic Surgery (Cardiothoracic Vascular Surgery) · taxonomy 208G00000X
- **State license:** A171765 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 10 WOODLAND RD, Saint Helena, CA 94574-9554
- **Phone:** (650) 804-8093
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 7 organizations under Medicare reassignment (form CMS-855R): Adventist Health Physicians Network (NPI 1003113192, Saint Helena, CA); St. Helena Hospital (NPI 1720078082, Saint Helena, CA); Providence Medical Foundation (NPI 1740584473, Santa Rosa, CA); Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA); Northwestern Medical Faculty Foundation (NPI 1346235314, Carol Stream, IL); and 2 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Northwestern University Feinberg Medical School, class of 2008
## Record status
- **NPPES last updated:** November 11, 2025
- **Other identifiers:** Medicaid 128981100 (FL); Other WF482 (FL)
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Source: [NPI Profile](https://npiprofile.com/npi/1073765517) · Data from the CMS NPPES public registry.