1. Home
  2. Directory
  3. California
  4. Walnut Creek
  5. Dermatology
  6. NPI Profile

GOLDEN STATE DERMATOLOGY ASSOCIATES, INC.
NPI 1700860871
Dermatology in Walnut Creek, CA

Active since December 02, 2005CLIA Certified · 5 labs
355 LENNON LN STE 255, WALNUT CREEK, CA 94598(925) 932-7704(925) 932-7752 Get Directions Write a Review

NPPES record last updated: March 27, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 27, 2026, Mar 7, 2023, Aug 22, 2019 (3 updates tracked since 2019).

About Golden State Dermatology Associates, Inc. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GOLDEN STATE DERMATOLOGY ASSOCIATES, INC. (NPI 1700860871) is a healthcare organization registered as a dermatology in Walnut Creek, California and active in the NPI registry since December 2005. The organization holds 5 active CLIA laboratory certificates, maintains 13 additional practice locations, and lists Jeffrey Thomas Bortz, Owner/medical Director, as its authorized official.

NPPES Registry Identity

NPI1700860871
Entity TypeOrganization
Primary Taxonomy207N00000X
Legal Business NameGOLDEN STATE DERMATOLOGY ASSOCIATES, INC.
Location Address355 LENNON LN STE 255Walnut Creek, CA 94598-2496
Mailing Address370 N Wiget Ln Ste 250Walnut Creek, CA 94598-2488 · (925) 945-7005 · Fax (925) 954-1822
Phone(925) 932-7704
Fax(925) 932-7752
Organization SubpartNo
Authorized OfficialJeffrey Thomas BortzOwner/medical Director · (925) 932-7704
Enumeration DateDecember 2, 2005
Last NPPES UpdateMarch 27, 20263 updates tracked since enumeration
NPPES CertifiedMarch 27, 2026
✔ NPI 1700860871 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 4

★ Primary SpecialtyDermatologyAllopathic & Osteopathic Physicians
Taxonomy Code207N00000X
Definition
A dermatologist is trained to diagnose and treat pediatric and adult patients with benign and malignant disorders of the skin, mouth, external genitalia, hair and nails, as well as a number of sexually transmitted diseases. The dermatologist has had additional training and experience in the diagnosis and treatment of skin cancers, melanomas, moles and other tumors of the skin, the management of contact dermatitis and other allergic and nonallergic skin disorders, and in the recognition of the skin manifestations of systemic (including internal malignancy) and infectious diseases. Dermatologists have special training in dermatopathology and in the surgical techniques used in dermatology. They also have expertise in the management of cosmetic disorders of the skin such as hair loss and scars and the skin changes associated with aging.
Also ListedDermatology · MOHS-Micrographic SurgeryTaxonomy 207ND0101X
Also ListedDermatology · DermatopathologyTaxonomy 207ND0900X
Also ListedDermatology · Procedural DermatologyTaxonomy 207NS0135X
355 LENNON LN STE 255, Walnut Creek, CA 94598
Open in Google Maps ↗

Secondary Practice Locations 13

Location 11058 Murrieta BlvdLivermore, CA 94550-4111 · Phone (925) 277-1300 ext. 92594
Location 25640 N Fresno St Ste 110Fresno, CA 93710-6098 · Phone (559) 266-9906
Location 31200 Central Blvd Ste DBrentwood, CA 94513-2227 · Phone (925) 308-9510
Location 4410 E Yosemite Ave Ste CMerced, CA 95340-8220 · Phone (209) 722-7801
Location 5355 Lennon Ln Ste 235Walnut Creek, CA 94598-2544 · Phone (925) 357-9050 · Fax (925) 357-9040
Location 62255 Ygnacio Valley Rd Ste B1Walnut Creek, CA 94598-3335 · Phone (925) 945-7005 ext. 92594
Location 71000 Delbon Ave Ste 8Turlock, CA 95382-2008 · Phone (209) 722-7801
Location 81542 N Tracy Blvd # ATracy, CA 95376-2903 · Phone (209) 836-2220
Location 95201 Norris Canyon RdSan Ramon, CA 94583-5411 · Phone (925) 277-1300
Location 10280 Baldwin AveSan Mateo, CA 94401-3915 · Phone (650) 727-6008
Location 115575 W Las Positas Blvd Ste 260Pleasanton, CA 94588-5803 · Phone (925) 847-3020
Location 12400 Taylor Blvd Ste 301Pleasant Hill, CA 94523-2160 · Phone (925) 687-8882 · Fax (925) 318-9657
Location 131324 Nelson AveModesto, CA 95350-5374 · Phone (209) 524-9481

Other Identifiers 2

OtherA487440CA · License
Other05D096539CA · Clia Number

Group Practice 1

Group TaxonomyThis provider is a business group of one or more individual practitioners, who practice with different areas of specialization.193200000X MULTI-SPECIALTY GROUP

CLIA Laboratory Certificates CMS CLIA 9

Laboratory certificates issued under the Clinical Laboratory Improvement Amendments (CLIA) program, which sets federal quality standards for human laboratory testing in the United States. There is no official CMS crosswalk between CLIA and NPI numbers; these certificates are associated with this NPI by matching facility names, locations and phone numbers in the CMS CLIA registry.

Certificate of Waiver 05D2268980

Golden State Dermatology Associates, Inc · San Ramon, CA
Active · expires Aug 3, 2027
CLIA Number05D2268980
Laboratory TypePhysician Office
Certificate Effective DateAugust 4, 2025
Certificate Expiration DateAugust 3, 2027
Laboratory DirectorJohn E. Call
Laboratory Phone(925) 277-1300
Laboratory LocationGolden State Dermatology Associates, Inc5201 Norris Canyon Rd Ste 320, San Ramon, CA 94583
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory to perform only waived tests.

Certificate of Accreditation 05D0701455

Golden State Dermatology Associates Inc · Modesto, CA
Active · expires Nov 3, 2026
CLIA Number05D0701455
Laboratory TypePhysician Office
Certificate Effective DateNovember 4, 2024
Certificate Expiration DateNovember 3, 2026
Laboratory DirectorDr. Christian C. Jones
Laboratory Phone(209) 524-9481
Laboratory LocationGolden State Dermatology Associates Inc1324 Nelson Ave Ste B, Modesto, CA 95350
CLIA data matches this NPI record on: Address Name Phone
This is a certificate that is issued to a laboratory on the basis of the laboratory's accreditation by an accreditation organization approved by CMS.

Certificate of Compliance 05D2230384

Golden State Dermatology- Turlock · Turlock, CA
Active · expires Feb 4, 2027
CLIA Number05D2230384
Laboratory TypePhysician Office
Certificate Effective DateFebruary 5, 2025
Certificate Expiration DateFebruary 4, 2027
Laboratory DirectorChristian C. Jones
Laboratory Phone(209) 226-4644
Laboratory LocationGolden State Dermatology- Turlock1000 Delbon Ave, Ste 8, Turlock, CA 95382
CLIA data matches this NPI record on: Address
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

Certificate of Compliance 05D2173819

Golden State Dermatology Associates Inc · Livermore, CA
Active · expires Mar 23, 2027
CLIA Number05D2173819
Laboratory TypePhysician Office
Certificate Effective DateMarch 24, 2025
Certificate Expiration DateMarch 23, 2027
Laboratory DirectorMinh Ngoc Dang
Laboratory Phone(925) 443-0980
Laboratory LocationGolden State Dermatology Associates Inc1074 Murietta Blvd, Livermore, CA 94550
CLIA data matches this NPI record on: Name
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

Certificate of Compliance 05D2228655

Golden State Dermatology - 11th Street, Tracy · Tracy, CA
Active · expires Feb 4, 2027
CLIA Number05D2228655
Laboratory TypePhysician Office
Certificate Effective DateFebruary 5, 2025
Certificate Expiration DateFebruary 4, 2027
Laboratory DirectorMinh Dang
Laboratory Phone(209) 836-2220
Laboratory LocationGolden State Dermatology - 11th Street, Tracy632 W 11th St, Ste 219, Tracy, CA 95376
CLIA data matches this NPI record on: Phone
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

Certificate of Compliance 05D2187186

Golden State Dermatology Associates Inc Brentwood · Brentwood, CA
Expired · Aug 10, 2026
CLIA Number05D2187186
Laboratory TypePhysician Office
Certificate Effective DateAugust 11, 2024
Certificate Expiration DateAugust 10, 2026
Laboratory DirectorHovik Ashchyan
Laboratory Phone(925) 308-9510
Laboratory LocationGolden State Dermatology Associates Inc Brentwood1200 Central Blvd Ste D, Brentwood, CA 94513
CLIA data matches this NPI record on: Address Name Phone
This certificate is issued to a laboratory after an inspection that finds the laboratory to be in compliance with all applicable CLIA requirements.

Other Providers at the Same Location NPPES 4

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

GRACE KIM SOHN M.D.
Dermatology
355 LENNON LN STE 255
WALNUT CREEK, CA 94598
Contra Costa County (925) 932-7704
MRS. NICOLE RAMOS PETRO PA-C
Physician Assistant (Medical)
355 LENNON LN STE 255
WALNUT CREEK, CA 94598
Contra Costa County (925) 932-7704
HOVIK ASHCHYAN MD
Dermatology
355 LENNON LN STE 255
WALNUT CREEK, CA 94598
Contra Costa County (925) 357-9785
ELAINE ROTHA LIM
Physician Assistant (Surgical)
355 LENNON LN STE 255
WALNUT CREEK, CA 94598
Contra Costa County (925) 932-7704

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Golden State Dermatology Associates, Inc.'s NPI number?

The NPI number for Golden State Dermatology Associates, Inc. is 1700860871. It was assigned to this organization in the NPPES registry on December 2, 2005.

Where is Golden State Dermatology Associates, Inc. located?

Golden State Dermatology Associates, Inc. is located at 355 Lennon Ln Ste 255, Walnut Creek, CA 94598. The listed phone number is (925) 932-7704.

What is Golden State Dermatology Associates, Inc.'s specialty?

The primary specialty registered for this NPI is Dermatology with taxonomy code 207N00000X.

Does Golden State Dermatology Associates, Inc. hold CLIA laboratory certificates?

Yes. 5 active CLIA laboratory certificates are associated with this NPI under the federal Clinical Laboratory Improvement Amendments program. The certificates are listed in the CLIA Laboratory Certificates section above.

When was this NPI record last updated?

The NPPES record for Golden State Dermatology Associates, Inc. was last updated on March 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.