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

Individual provider Internal Medicine Physician · NPI 1871554766

Steven R Tolkan, MD is a Nephrology in Fairfield, California. Graduated from University of Wisconsin School of Medicine in 1973, 53 years ago. Practices as a sole proprietor. Licensed in California.

Years since qualifying
53
Trained at
University of Wisconsin School of Medicine
Licensed in
CA
In the registry since
2006
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

1525 Webster St Ste A
Fairfield, CA 94533-4935
Phone: (707) 423-2506
Fax: (707) 429-1158
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Nephrology Physician (primary) Taxonomy 207RN0300X · Licence G83696 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence G83696 (CA)

Record details

NPI number1871554766
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 30, 2006
Last updated in NPPESApril 24, 2014

Medicare enrollment

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

Medicare specialtyNEPHROLOGY
Also practisesINTERNAL MEDICINE
Medical schoolUNIVERSITY OF WISCONSIN SCHOOL OF MEDICINE
Graduated 1973 (53 years in practice)
Accepts Medicare assignment Not indicated
Practice locations2 on file with Medicare

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