DR. ALLAN DOUGLAS SIEFKIN MD
NPI 1033113758
Internal Medicine in Sacramento, CA
NPI Status: Active since June 09, 2005
Contact Information
2315 STOCKTON BLVD
SACRAMENTO, CA
ZIP 95817
Phone: (916) 734-1166
Fax: (916) 734-3234
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Internal Medicine
About ALLAN SIEFKIN
This page provides the complete NPI Profile along with additional information for Allan Siefkin, an internist established in Sacramento, California with a medical specialization in Internal Medicine. The healthcare provider is registered in the NPI registry with number 1033113758 assigned on June 2005. The practitioner's primary taxonomy code is 207R00000X with license number G032410 (CA). The provider is registered as an individual and his NPI record was last updated September 2025.
- NPI
- 1033113758
- Provider Name
- DR. ALLAN DOUGLAS SIEFKIN MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 2315 STOCKTON BLVD SACRAMENTO, CA 95817
- Location Phone
- (916) 734-1166
- Location Fax
- (916) 734-3234
- Mailing Address
- 2315 STOCKTON BLVD SACRAMENTO, CA 95817
- Mailing Phone
- (916) 734-1166
- Mailing Fax
- (916) 734-3234
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-09-2005
- Last Update Date
- 09-11-2025
- Code Navigator
An internist like Allan Siefkin is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.
Location Map
Specialty - Primary Taxonomy
The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.
- Classification
Internal Medicine
- Taxonomy Code
- 207R00000X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- G032410
- License State
- CA
- Taxonomy Description
- A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 207RC0200X | Allopathic & Osteopathic Physicians | Internal Medicine | G032410 (CA) |
| 2 | 207RP1001X | Allopathic & Osteopathic Physicians | Internal Medicine | G032410 (CA) |
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NPI Validation Check Digit Calculation
The following table explains the step by step NPI number validation process using the ISO standard Luhn algorithm.
| Start with the original NPI number, the last digit is the check digit and is not used in the calculation. | |||||||||
| 1 | 0 | 3 | 3 | 1 | 1 | 3 | 7 | 5 | 8 |
| Step 1: Double the value of the alternate digits, beginning with the rightmost digit. | |||||||||
| 2 | 0 | 6 | 3 | 2 | 1 | 6 | 7 | 10 | |
| Step 2: Add all the doubled and unaffected individual digits from step 1 plus the constant number 24. | |||||||||
| 2 + 0 + 6 + 3 + 2 + 1 + 6 + 7 + 1 + 0 + 24 = 52 | |||||||||
| Step 3: Subtract the total obtained in step 2 from the next higher number ending in zero, the result is the check digit. | |||||||||
| 60 - 52 = 8 | 8 | ||||||||
The NPI number 1033113758 is valid because the calculated check digit 8 using the Luhn validation algorithm matches the last digit of the original NPI number.
Other Providers at the Same Location
The following 20 providers are registered at the same or nearby location.
| NPI | Name / Type | Taxonomy | Address |
|---|---|---|---|
| 1609872001 | ROBERT JAMES OMALLEY NP Individual | Nurse Practitioner | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-5538 |
| 1164428082 | MATTHEW BOBINSKI MD Individual | Radiology (Neuroradiology) | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-3606 |
| 1255338562 | DR. JOSEPH MICHAEL GALANTE MD Individual | Surgery | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-2724 |
| 1245211184 | DR. CALANDRA D LINDSEY D.O. Individual | Psychiatry & Neurology (Neurology) | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-3514 |
| 1750362620 | DR. HARVINDER MUNDH M.D. Individual | Psychiatry & Neurology (Neurology) | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-3514 |
| 1316928997 | DR. GAREN JOHN WINTEMUTE MD, MPH Individual | Emergency Medicine | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-3083 |
| 1154302727 | UNIVERSITY OF CALIFORNIA, DAVIS, MEDICAL CENTER Organization | General Acute Care Hospital | 2315 STOCKTON BLVD PSSB 2100 SACRAMENTO, CA 95817 (916) 734-5016 |
| 1356322150 | DR. NATHAN KUPPERMANN M.D., M.P.H. Individual | Emergency Medicine | 2315 STOCKTON BLVD PSSB SUITE 2100 SACRAMENTO, CA 95817 (916) 734-1535 |
| 1730160441 | ANTHONY F. PHILIPPS M.D. Individual | Pediatrics (Neonatal-Perinatal Medicine) | 2315 STOCKTON BLVD UC DAVIS HEALTH SYSTEM SACRAMENTO, CA 95817 (916) 734-5178 |
| 1033190418 | JO BRYAN NP Individual | Nurse Practitioner (Family) | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-5585 |
| 1831170216 | DR. KATREN RACHEL TYLER M.D. Individual | Emergency Medicine | 2315 STOCKTON BLVD PSSB 2100 SACRAMENTO, CA 95817 (916) 734-5010 |
| 1558342022 | GREG HACHIGIAN M.D. Individual | Emergency Medicine | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-5010 |
| 1417938911 | DR. AMBER AMALIA SMITH M.D. Individual | Psychiatry & Neurology (Neurology) | 2315 STOCKTON BLVD SACRAMENTO, CA 95817 (916) 734-3514 |
| 1679554125 | DR. JAY MERLE MILSTEIN MD Individual | Specialist | 2315 STOCKTON BLVD NICU SACRAMENTO, CA 95817 (916) 703-3050 |
| 1033190657 | DR. JOHN RAY RICHARDS M.D. Individual | Emergency Medicine | 2315 STOCKTON BLVD PSSB 2100 EMERGENCY MEDICINE SACRAMENTO, CA 95817 (916) 734-1537 |
| 1427039767 | DR. JEANETTE R PLEASURE MD Individual | Pediatrics (Neonatal-Perinatal Medicine) | 2315 STOCKTON BLVD NICU SACRAMENTO, CA 95817 (916) 703-3050 |
| 1386625721 | DR. FRANCIS R POULAIN Individual | Pediatrics (Neonatal-Perinatal Medicine) | 2315 STOCKTON BLVD NICU SACRAMENTO, CA 95817 (916) 703-3050 |
| 1174504443 | DR. MOHAMED REDA ALI JR. MD Individual | Surgery | 2315 STOCKTON BLVD DEPARTMENT OF SURGERY SACRAMENTO, CA 95817 (916) 734-4596 |
| 1861474199 | DR. DAVID G GREENHALGH MD Individual | Surgery | 2315 STOCKTON BLVD DEPARTMENT OF SURGERY SACRAMENTO, CA 95817 (916) 453-2050 |
| 1932181005 | KELLEEN ELIZABETH PORTE FNP Individual | Nurse Practitioner (Family) | 2315 STOCKTON BLVD EMERGENCY DEPARTMENT SACRAMENTO, CA 95817 (916) 734-3888 |
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1033113758, enumerated in the NPI registry as an "individual" on June 09, 2005
The provider is located at 2315 Stockton Blvd Sacramento, Ca 95817 and the phone number is (916) 734-1166
The provider's speciality is Internal Medicine with taxonomy code 207R00000X
This NPI record was last updated on June 09, 2005. To officially update your NPI information contact the National Plan and Provider Enumeration System (NPPES) at 1-800-465-3203 (NPI Toll-Free) or by email at [email protected].
NPI Profile data is regularly updated with the latest NPI registry information, if you would like to update or remove your NPI Profile in this website please contact us.