DR. JESSICA MARGARET DZUBNAR BARKER MD
NPI 1700349750
Surgery - Surgical Oncology in San Francisco, CA

NPI Status: Active since April 08, 2019

Contact Information

1825 4TH ST FL 3
SAN FRANCISCO, CA
ZIP 94143
Phone: (415) 353-7070

NPI Profile Information
Primary Taxonomy
Secondary Taxonomies
Secondary Locations
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Female
Surgery
Surgical Oncology

About JESSICA DZUBNAR BARKER

This page provides the complete NPI Profile along with additional information for Jessica Dzubnar Barker, a provider established in San Francisco, California with a medical specialization in Surgery, focusing in surgical oncology . The healthcare provider is registered in the NPI registry with number 1700349750 assigned on April 2019. The practitioner's primary taxonomy code is 2086X0206X with license number A181738 (CA). The provider is registered as an individual and her NPI record was last updated May 2026.

NPI: 1700349750
Provider Name: DR. JESSICA MARGARET DZUBNAR BARKER MD
Other Name: JESSICA DZUBNAR
Other Name Type: Professional Name (2)
Gender: Female
Entity Type: Individual
Location Address: 1825 4TH ST FL 3 SAN FRANCISCO, CA 94143
Location Phone: (415) 353-7070
Mailing Address: 1411 E 31ST ST OAKLAND, CA 94602
Is Sole Proprietor?: Yes
Enumeration Date: 04-08-2019
Last Update Date: 05-22-2026
Code Navigator

Location Map

Secondary Locations

1411 E 31st St
Oakland, CA 94602
(510) 437-4800

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: Surgery Surgical Oncology
Taxonomy Code: 2086X0206X
Type: Allopathic & Osteopathic Physicians
License No.: A181738
License State: CA
Taxonomy Description: A surgical oncologist is a well-qualified surgeon who has obtained additional training and experience in the multidisciplinary approach to the prevention, diagnosis, treatment, and rehabilitation of cancer patients, and devotes a major portion of his or her professional practice to these activities and cancer research.

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	390200000X	Student, Health Care	Student in an Organized Health Care Education/Training Program

NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1700349750, we treat the final digit (0) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 0

Pos 4

Unchanged

Pos 5

Doubled → 6

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

Check

Target digit

Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 0 → 0 3 → 6 9 → 18 → 9 5 → 10 → 1