Quick answers
- Which hospitals does Gregg Ellison work at?
- Medicare's official clinician data lists Gregg Ellison at 3 hospitals: Adventist Health Sierra Vista, Adventist Health Twin Cities and French Hospital Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregg Ellison see patients?
- Medicare's clinician data lists 2 practice locations, including Templeton, CA. Call before your visit to confirm the address.
- What is Gregg Ellison's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Gregg Ellison accept Medicare assignment?
- Medicare's clinician data says Gregg Ellison may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- Does Gregg Ellison offer telehealth?
- Medicare's clinician data says Gregg Ellison offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Gregg Ellison?
- (805) 434-1851, as listed in official Medicare / NPI Registry data.
- What is Gregg Ellison's NPI number?
- 1073573168. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregg Ellison works
Medicare's Facility Affiliation Data lists Gregg Ellison at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health Sierra VistaSan Luis Obispo, CA · Acute Care Hospital · CCN 050506
- Adventist Health Twin CitiesTempleton, CA · Acute Care Hospital · CCN 050633
- French Hospital Medical CenterSan Luis Obispo, CA · Acute Care Hospital · CCN 050232
Practice locations
Addresses where Gregg Ellison is enrolled with Medicare (CMS data updated 2026-10-02).
- 1051 Las Tablas RdTempleton, CA 93465
- 1105 Las Tablas RdTempleton, CA 93465 (805) 434‑1851
Group practices
Medicare enrollment lists Gregg Ellison as a member of this group (CMS data updated 2026-10-02).
- David B. Hammer123 clinicians in the group
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Templeton
Clinicians with the same Medicare primary specialty in Templeton, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 1977 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1073573168 |
| 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 2026-10-02, retrieved 2026-10-29
- 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