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

Stephen Kalkstein, MD

Individual provider Family Medicine Physician · NPI 1356438113

Stephen Kalkstein, MD is a Family Medicine Physician in Martinez, California. Licensed in California. Registered with an NPI since 2006.

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

2500 Alhambra Avenue Contra Costa Regional Medical Center And Health Centers
Martinez, CA 94553-3156
Phone: (925) 370-5110
Fax: (925) 370-5142
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence G25872 (CA)

Record details

NPI number1356438113
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 5, 2006
Last updated in NPPESJuly 8, 2007
Mailing address50 Douglas Drive Suite 39, Health Services Administration, Martinez, CA 94553-4098

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