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

Individual provider Internal Medicine Physician · NPI 1437256906

William Chunghun Sim, MD is an Internal Medicine in Downey, California. Graduated from Stanford University School of Medicine in 1990, 36 years ago. Practices with Frischer Medical Group Inc, a 4-clinician group, accepts Medicare assignment and offers telehealth. Licensed in California.

Years since qualifying
36
Trained at
Stanford University School of Medicine
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

11480 Brookshire Ave 200
Downey, CA 90241-9998
Phone: (562) 806-0874
Fax: (562) 927-4801
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G72353 (CA)

Record details

NPI number1437256906
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 19, 2006
Last updated in NPPESDecember 20, 2011
Mailing address11480 Brookshire Ave, 200, Downey, CA 90241-9998

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolSTANFORD UNIVERSITY SCHOOL OF MEDICINE
Graduated 1990 (36 years in practice)
Group practice Frischer Medical Group Inc — 4 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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