Quick answers
- Where does John Ruddy see patients?
- Medicare's clinician data lists 2 practice locations, including San Ramon, CA and Fremont, CA. Call before your visit to confirm the address.
- What is John Ruddy's specialty?
- Medicare lists Sleep Medicine as the primary specialty.
- Does John Ruddy accept Medicare assignment?
- Yes. Medicare's clinician data says John Ruddy accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John Ruddy offer telehealth?
- Medicare's clinician data says John Ruddy offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John Ruddy?
- (925) 820-4472, as listed in official Medicare / NPI Registry data.
- What is John Ruddy's NPI number?
- 1902890130. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where John Ruddy is enrolled with Medicare (CMS data updated 2026-10-02).
- 2222 Camino RamonSan Ramon, CA 94583 (925) 820‑4472
- 39055 Hastings St, Suite 106Fremont, CA 94538 (925) 820‑4472
Group practices
Medicare enrollment lists John Ruddy as a member of this group (CMS data updated 2026-10-02).
- Puja Thakkar DO Medical Corporation7 clinicians in the group
Specialties
- Sleep Medicineprimary
Other sleep medicine doctors in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Georgetown University School Of Medicine |
| Graduation year | 1980 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1902890130 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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