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

Mark E. Williams, MD

Individual provider Emergency Medicine Physician · NPI 1770661530

Mark E. Williams, MD is an Emergency Medicine in Santa Rosa, California. Graduated from University of Michigan Medical School in 1996, 30 years ago. Practices with Hawaii Permanente Medical Group Inc, a 705-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
30
Trained at
University of Michigan Medical School
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

401 Bicentennial Way
Santa Rosa, CA 95403-2149
Phone: (707) 393-4800
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence A72120 (CA)

Record details

NPI number1770661530
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedNovember 1, 2006
Last updated in NPPESApril 5, 2024
Certification dateApril 5, 2024

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF MICHIGAN MEDICAL SCHOOL
Graduated 1996 (30 years in practice)
Group practice Hawaii Permanente Medical Group Inc — 705 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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