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

Dr. William Joseph Frem, DO

Individual provider Internal Medicine Physician · NPI 1831820646

Dr. William Joseph Frem, DO is an Internal Medicine in Los Angeles, California. Qualified in 2022, 4 years ago. Practices with Galen Inpatient Physicians PC, a 1,031-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
4
Licensed in
CA
In the registry since
2022
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.

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Practice location Address checks out

1720 E Cesar E Chavez Ave
Los Angeles, CA 90033-2414
Phone: (323) 268-5000
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 20A22067 (CA)

Record details

NPI number1831820646
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 22, 2022
Last updated in NPPESSeptember 3, 2025
Certification dateSeptember 3, 2025

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2022 (4 years in practice)
Group practice Galen Inpatient Physicians Pc — 1031 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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