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

Mark Stephen Singer, MD

Individual provider Emergency Medicine Physician · NPI 1962486332

Mark Stephen Singer, MD is an Internal Medicine in Napa, California. Graduated from University of California, Geffen School of Medicine in 1983, 43 years ago. Practices as a sole proprietor and accepts Medicare assignment. Licensed in California.

Years since qualifying
43
Trained at
University of California, Geffen School of Medicine
Licensed in
CA
In the registry since
2005
Specialties on file
2
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

3334 Sterling Ct
Napa, CA 94558-4262
Phone: (707) 365-5151
Fax: (707) 252-4887
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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 G53924 (CA)
Emergency Medicine Physician Taxonomy 207P00000X · Licence CAG539243 (CA)

Record details

NPI number1962486332
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedNovember 30, 2005
Last updated in NPPESJuly 12, 2010
Mailing address3334 Sterling Ct, Napa, CA 94558-4262

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Also practisesEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, GEFFEN SCHOOL OF MEDICINE
Graduated 1983 (43 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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