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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

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

Active since December 02, 2005CLIA Certified · 10 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: October 13, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Oct 13, 2026, Oct 1, 2026, Sep 24, 2026 and 3 more (6 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 10 active CLIA laboratory certificates, maintains 20 additional practice locations, and lists Jay William Zimmerman, Provider, 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 94598-2454 · (925) 945-7005 · Fax (925) 954-1822
Phone(925) 932-7704
Fax(925) 932-7752
Organization SubpartNo
Authorized OfficialJay William ZimmermanProvider · (925) 813-2971
Enumeration DateDecember 2, 2005
Last NPPES UpdateOctober 13, 20266 updates tracked since enumeration
NPPES CertifiedOctober 13, 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
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Secondary Practice Locations 20

Location 11542 N Tracy Blvd # ATracy, CA 95376-2903 · Phone (209) 836-2220
Location 22990 S Sepulveda Blvd Ste 300Los Angeles, CA 90064-3996 · Phone (323) 421-4747
Location 35575 W Las Positas Blvd Ste 260Pleasanton, CA 94588-5803 · Phone (925) 847-3020
Location 4355 Lennon Ln Ste 235Walnut Creek, CA 94598-2544 · Phone (925) 357-9050 · Fax (925) 357-9040
Location 51200 Central Blvd Ste DBrentwood, CA 94513-2227 · Phone (925) 308-9510
Location 617600 Monterey Rd Ste AMorgan Hill, CA 95037-3669 · Phone (669) 766-2021
Location 75640 N Fresno St Ste 110Fresno, CA 93710-6098 · Phone (559) 266-9906
Location 88735 Sierra College Blvd Ste 200Roseville, CA 95661-5992 · Phone (916) 721-2836
Location 9280 Baldwin AveSan Mateo, CA 94401-3915 · Phone (650) 727-6008
Location 10400 Taylor Blvd Ste 301Pleasant Hill, CA 94523-2160 · Phone (925) 687-8882 · Fax (925) 318-9657
Location 111058 Murrieta BlvdLivermore, CA 94550-4111 · Phone (925) 277-1300 ext. 92594
Location 12410 E Yosemite Ave Ste CMerced, CA 95340-8220 · Phone (209) 722-7801
Location 13230 N 1680 E Ste N1St George, UT 84790-2596 · Phone (925) 945-7005
Location 142255 Ygnacio Valley Rd Ste B1Walnut Creek, CA 94598-3335 · Phone (925) 945-7005 ext. 92594
Location 155201 Norris Canyon RdSan Ramon, CA 94583-5411 · Phone (925) 277-1300
Location 168890 N Union Blvd Ste 207Colorado Springs, CO 80920-2701 · Phone (925) 945-7005
Location 171324 Nelson AveModesto, CA 95350-5374 · Phone (209) 524-9481
Location 18355 Lennon Ln Ste 295Walnut Creek, CA 94598-2563 · Phone (925) 945-7005
Location 196120 Mae Anne Ave Ste 1Reno, NV 89523-4706 · Phone (775) 746-0196
Location 201000 Delbon Ave Ste 8Turlock, CA 95382-2008 · Phone (209) 722-7801

Other Identifiers 2

OtherA487440CA · License
Other05D096539CA · Clia Number

Medicare Participation & PECOS CMS

Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Golden State Dermatology Associates Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date

Revalidation due by March 31, 2027

Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date
StateCaliforniaEnrollment IDO20070523000605Non-DME Part B · Clinic/Group PracticeDue dateMarch 31, 2027
Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

103

Medicare enrollment records show 103 clinicians reassign Medicare billing to Golden State Dermatology Associates Inc, which bills Medicare for the services they deliver. Of these, 6 practice at this address and 15 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 7

Dermatology89
Nurse Practitioner7
Pathology2
Plastic and Reconstructive Surgery2
Emergency Medicine1
Micrographic Dermatologic Surgery (MDS)1
Otolaryngology1

Nearest to this location (20)

See all 103
Alicia Mizes
Dermatology
NPI 1275275737
355 LENNON LN STE 295
Walnut Creek, CA 94598
(925) 357-9786
✔ PECOSSame address
Jeffrey Bortz, M.D.
Dermatology
NPI 1710191382
355 LENNON LN SUITE 355
Walnut Creek, CA 94598
(925) 932-7704
✔ PECOS✔ Accepts MedicareSame address
Hovik Ashchyan, MD
Dermatology
NPI 1710477088
355 LENNON LN STE 255
Walnut Creek, CA 94598
(925) 357-9785
✔ PECOS✔ Accepts MedicareSame address
Sarah Semaan, MD
Dermatology
NPI 1952987588
355 LENNON LN STE 295
Walnut Creek, CA 94598
(925) 357-9786
✔ PECOS✔ Accepts MedicareSame address
Rahul Seth, M.D.
Otolaryngology
NPI 1073784682
355 LENNON LN STE 235
Walnut Creek, CA 94598
(925) 357-9050
✔ PECOS✔ Accepts MedicareSame address
Grace Sohn, M.D.
Dermatology
NPI 1023405727
355 LENNON LN STE 255
Walnut Creek, CA 94598
(925) 932-7704
✔ PECOS✔ Accepts MedicareSame address
Kathleen Ting, MD
Dermatology
NPI 1407934599
320 LENNON LN
Walnut Creek, CA 94598
(925) 906-2000
✔ PECOS✔ Accepts Medicare0.1 mi
Timothy Mccalmont, M.D.
Pathology
NPI 1275598732
370 N WIGET LN STE 250
Walnut Creek, CA 94598
(925) 278-7592
✔ PECOS✔ Accepts Medicare0.3 mi
Edward Becker, MD
Dermatology
NPI 1962515858
2255 YGNACIO VALLEY RD #B-1
Walnut Creek, CA 94598
(925) 945-7005
✔ PECOS0.4 mi
Lauren Larrabure, MD
Dermatology
NPI 1699263087
2255 YGNACIO VALLEY RD STE B1
Walnut Creek, CA 94598
(925) 945-7005
✔ PECOS✔ Accepts Medicare0.4 mi
Hadley Pearson, MD
Dermatology
NPI 1306334586
2255 YGNACIO VALLEY RD STE B1
Walnut Creek, CA 94598
(925) 945-7005
✔ PECOS✔ Accepts Medicare0.4 mi
Jay Zimmerman, M.D.
Dermatology
NPI 1396789731
2255 YGNACIO VALLEY RD STE B1
Walnut Creek, CA 94598
(925) 945-7005
✔ PECOS✔ Accepts Medicare0.4 mi
Emily Green, MD
Pathology
NPI 1750476826
370 N WIGET LN STE 250
Walnut Creek, CA 94598
(925) 278-7592
✔ PECOS✔ Accepts Medicare0.7 mi
Curtis Raskin, MD PHD FAAD
Dermatology
NPI 1154358034
400 TAYLOR BLVD STE 301
Pleasant Hill, CA 94523
(925) 687-8882
✔ PECOS✔ Accepts Medicare3.4 mi
Philip Song, M.D.
Dermatology
NPI 1083859888
3201 DANVILLE BLVD STE 110
Alamo, CA 94507
(925) 362-0992
✔ PECOS✔ Accepts Medicare5.4 mi
John Call, MD
Dermatology
NPI 1376997767
5201 NORRIS CANYON RD STE 320
San Ramon, CA 94583
(925) 277-1300
✔ PECOS✔ Accepts Medicare11 mi
Robert Greenberg, MD
Dermatology
NPI 1639195316
5201 NORRIS CANYON RD STE 130
San Ramon, CA 94583
(925) 277-1300
✔ PECOS✔ Accepts Medicare11 mi
Johnathan Shih, MD
Plastic and Reconstructive Surgery
NPI 1841796646
3801 HOWE ST
Oakland, CA 94611
(510) 616-8472
✔ PECOS✔ Accepts Medicare14 mi
Matthew Scholl
Dermatology
NPI 1215677232
400 EVELYN AVE STE 115
Albany, CA 94706
(510) 524-0224
✔ PECOS15 mi
Mario Malvehy, M.D.
Emergency Medicine
NPI 1386619054
5700 STONERIDGE MALL RD STE 120
Pleasanton, CA 94588
(925) 494-0898
✔ PECOS✔ Accepts Medicare17 mi
See all 103 clinicians

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

CLIA Laboratory Certificates CMS CLIA 11

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 Compliance 05D0946554

Golden State Dermatology Associates, Inc · Pleasant Hill, CA
Active · expires Nov 30, 2026
CLIA Number05D0946554
Laboratory TypePhysician Office
Certificate Effective DateAugust 6, 2024
Certificate Expiration DateNovember 30, 2026
Laboratory DirectorCurtis A. Raskin
Laboratory Phone(925) 687-8882
Laboratory LocationGolden State Dermatology Associates, Inc400 Taylor Blvd Suite 301, Pleasant Hill, CA 94523
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.

Certificate of Compliance 05D2187186

Golden State Dermatology Associates Inc Brentwood · Brentwood, CA
Active · expires Nov 30, 2026
CLIA Number05D2187186
Laboratory TypePhysician Office
Certificate Effective DateAugust 11, 2024
Certificate Expiration DateNovember 30, 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.

Certificate of Compliance 06D0979770

Golden State Dermatology Associates Inc · Colorado Springs, CO
Active · expires Jan 3, 2027
CLIA Number06D0979770
Laboratory TypePhysician Office
Certificate Effective DateJanuary 4, 2025
Certificate Expiration DateJanuary 3, 2027
Laboratory DirectorDr. Kevin L. Whaley
Laboratory Phone(719) 667-0888
Laboratory LocationGolden State Dermatology Associates Inc8890 N Union Blvd, Ste 207, Colorado Springs, CO 80920
CLIA data matches this NPI record on: Address 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 05D0596807

Golden State Dermatology · San Mateo, CA
Active · expires Nov 30, 2026
CLIA Number05D0596807
Laboratory TypePhysician Office
Certificate Effective DateSeptember 18, 2023
Certificate Expiration DateNovember 30, 2026
Laboratory DirectorCarie T. Chui
Laboratory Phone(650) 344-1121
Laboratory LocationGolden State Dermatology280 Baldwin Ave, San Mateo, CA 94401
CLIA data matches this NPI record on: Address 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 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.

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.

Is Golden State Dermatology Associates Inc enrolled in Medicare?

Yes. Golden State Dermatology Associates Inc is registered in the Medicare PECOS enrollment system.

When is Golden State Dermatology Associates Inc's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by March 31, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through Golden State Dermatology Associates Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 103 clinicians in 7 Medicare specialties reassign their Medicare billing to Golden State Dermatology Associates Inc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. The largest specialties are Dermatology (89), Nurse Practitioner (7) and Pathology (2). Of these, 6 practice at this address and 15 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Does Golden State Dermatology Associates Inc hold CLIA laboratory certificates?

Yes. 10 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 October 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 25 days 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.