Quick answers
- Does Gansevoort H. Dunnington accept Medicare assignment?
- Yes. Medicare's clinician data says Gansevoort H. Dunnington accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Gansevoort H. Dunnington see?
- In 2024, CMS data shows 354 Original Medicare patients and 719 services for Gansevoort H. Dunnington. This counts Original Medicare only and measures volume, not quality.
- What is Gansevoort H. Dunnington's NPI number?
- 1336335140. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Gansevoort H. Dunnington, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 354 |
|---|---|
| Services billed to Medicare | 719 |
| Different services or procedures | 117 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more (99205)103 services
- Telephone medical discussion with physician, 21-30 minutes (99443)58 services
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes (99222)48 services
- Extensive reconstruction of upper heart chamber and alteration of electrical pathway using an endoscope (33266)44 services
- Replacement of aortic valve through the skin and femoral artery (33361)37 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Atrial fibrillation62%
- Ischemic heart disease52%
- Heart failure52%
- Arthritis46%
Hospitals where Gansevoort H. Dunnington works
Medicare's Facility Affiliation Data lists Gansevoort H. Dunnington at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Adventist Health ClearlakeClearlake, CA · Critical Access Hospital · Medicare rating: 2 of 5 stars · Emergency services: listed by Medicare · CCN 051317
- Adventist Health St HelenaSaint Helena, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050013
- Adventist Health Ukiah ValleyUkiah, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050301
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050174
- Sequoia HospitalRedwood City, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050197
Practice locations
Addresses where Gansevoort H. Dunnington is enrolled with Medicare (CMS data updated October 2, 2026).
- 2900 Whipple Ave, Suite 140Redwood City, CA 94062 (650) 261‑2366
- 500 Doyle Park Dr, Suite G05Santa Rosa, CA 95405 (707) 576‑7100
- 6 Woodland Rd, Suite 302Saint Helena, CA 94574 (707) 963‑3865
Group practices
Medicare enrollment lists Gansevoort H. Dunnington as a member of these groups (CMS data updated October 2, 2026).
- Providence Medical Foundation1,466 clinicians in the group
- Dignity Health Medical Foundation1,184 clinicians in the group
- Adventist Health Physicians Network628 clinicians in the group
Specialties
- Cardiac Surgeryprimary
- Thoracic Surgeryalso
Other cardiac surgeons in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Other clinicians in Providence Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Virginia Commonwealth University, School Of Medicine |
| Graduation year | 1997 (29 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1336335140 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians