Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Russell M. Greif, DO

Individual provider Internal Medicine Physician · NPI 1669519765

Dr. Russell M. Greif, DO is an Internal Medicine in Lancaster, California. Graduated from College of Osteo Med of the Pacific at Pomona in 1986, 40 years ago. Practices as a sole proprietor, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
40
Trained at
College of Osteo Med of the Pacific at Pomona
Licensed in
CA
In the registry since
2007
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

44241 15th St W Ste 206
Lancaster, CA 93534-4037
Phone: (661) 726-6490
Fax: (661) 726-6494
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 20A5410 (CA)

Record details

NPI number1669519765
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedJanuary 30, 2007
Last updated in NPPESDecember 13, 2011
Mailing address2010 W Avenue K # 632, Lancaster, CA 93536-5229

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolCOLLEGE OF OSTEO MED OF THE PACIFIC AT POMONA
Graduated 1986 (40 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

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