Quick answers
- Does Arun K. Chauhan accept Medicare assignment?
- Yes. Medicare's clinician data says Arun K. Chauhan 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 Arun K. Chauhan see?
- In 2024, CMS data shows 12 Original Medicare patients and 60 services for Arun K. Chauhan. This counts Original Medicare only and measures volume, not quality.
- What is Arun K. Chauhan's NPI number?
- 1497834535. 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 Arun K. Chauhan, 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 | 12 |
|---|---|
| Services billed to Medicare | 60 |
| Different services or procedures | 4 |
| Participating Medicare provider | Yes |
| Average age of these patients | 68 |
Hospitals where Arun K. Chauhan works
Medicare's Facility Affiliation Data lists Arun K. Chauhan 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.
- Kaiser Foundation Hospital - Walnut CreekWalnut Creek, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050072
Practice locations
Addresses where Arun K. Chauhan is enrolled with Medicare (CMS data updated October 2, 2026).
- 101 Monroe StPetaluma, CA 94954 (707) 763‑4109
- 1425 S Main StWalnut Creek, CA 94596 (925) 295‑4000
- 901 Nevin AveRichmond, CA 94801 (510) 307‑1500
Group practices
Medicare enrollment lists Arun K. Chauhan as a member of this group (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Petaluma
Clinicians with the same Medicare primary specialty in Petaluma, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2000 (26 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1497834535 |
| 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