Quick answers
- Which hospitals does Russell Greif work at?
- Medicare's official clinician data lists Russell Greif at 2 hospitals: Antelope Valley Hospital and Palmdale Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Russell Greif see patients?
- Medicare's clinician data lists 2 practice locations, including Lancaster, CA. Call before your visit to confirm the address.
- What is Russell Greif's specialty?
- Medicare lists Internal Medicine as the primary specialty.
- Does Russell Greif accept Medicare assignment?
- Yes. Medicare's clinician data says Russell Greif 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 Russell Greif offer telehealth?
- Medicare's clinician data says Russell Greif offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Russell Greif?
- (661) 726-6490, as listed in official Medicare / NPI Registry data.
- What is Russell Greif's NPI number?
- 1669519765. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Russell Greif works
Medicare's Facility Affiliation Data lists Russell Greif at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Antelope Valley HospitalLancaster, CA · Acute Care Hospital · CCN 050056
- Palmdale Regional Medical CenterPalmdale, CA · Acute Care Hospital · CCN 050204
Practice locations
Addresses where Russell Greif is enrolled with Medicare (CMS data updated 2026-10-02).
- 44241 15th St W, Suite 206Lancaster, CA 93534
- 44241 15th W St, Suite 206Lancaster, CA 93534 (661) 726‑6490
Specialties
- Internal Medicineprimary
Other internal medicine doctors in Lancaster
Clinicians with the same Medicare primary specialty in Lancaster, CA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | College Of Osteo Med Of The Pacific At Pomona |
| Graduation year | 1986 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1669519765 |
| 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