Allan Siefkin, MD
NPI 1033113758 · Internal Medicine Physician · Sacramento, CA
Allan Siefkin, MD is a Internal Medicine Physician provider in Sacramento, CA (NPI 1033113758).
Provider details
- NPI number
- 1033113758
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- License
- G032410 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
21 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2005-06-09
- Last updated
- 2025-09-11
Frequently asked questions
- What is Allan Siefkin's NPI number?
- Allan Siefkin's National Provider Identifier (NPI) is 1033113758, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Allan Siefkin's specialty?
- Allan Siefkin is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Allan Siefkin located?
- Allan Siefkin's practice location on file with NPPES is 2315 Stockton Blvd, Sacramento, CA 95817-2201.
- What is Allan Siefkin's phone number?
- The practice phone number listed in the NPPES registry for Allan Siefkin is (916) 734-1166.
- Is Allan Siefkin's NPI active?
- Yes — Allan Siefkin's NPI (1033113758) is active in the NPPES registry as of the last update on 2025-09-11.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.