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

Dr. Allan Douglas Siefkin, MD

Individual provider Internal Medicine Physician · NPI 1033113758

Dr. Allan Douglas Siefkin, MD is an Internal Medicine Physician in Sacramento, California. Licensed in California. Registered with an NPI since 2005.

Licensed in
CA
In the registry since
2005
Specialties on file
3
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

2315 Stockton Blvd
Sacramento, CA 95817-2201
Phone: (916) 734-1166
Fax: (916) 734-3234
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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 G032410 (CA)
Critical Care Medicine (Internal Medicine) Physician Taxonomy 207RC0200X · Licence G032410 (CA)
Pulmonary Disease Physician Taxonomy 207RP1001X · Licence G032410 (CA)

Record details

NPI number1033113758
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 9, 2005
Last updated in NPPESJuly 13, 2026

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