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CONTRA COSTA COUNTY
NPI 1750509162
Community/Behavioral Health in Martinez, CA

Active since April 23, 2007
10 DOUGLAS DR, SUITE 140, MARTINEZ, CA 94553(925) 957-5110(925) 646-9595 Get Directions Write a Review

NPPES record last updated: October 14, 2025. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Contra Costa County NPPES

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

CONTRA COSTA COUNTY (NPI 1750509162), doing business as Transitional Services, is a healthcare organization registered as a community/behavioral health in Martinez, California and active in the NPI registry since April 2007. The organization lists David D. Lee, Deputy Cfo, as its authorized official.

NPPES Registry Identity

NPI1750509162
Entity TypeOrganization
Primary Taxonomy251S00000X
Legal Business NameCONTRA COSTA COUNTY
Location Address10 DOUGLAS DR, SUITE 140Martinez, CA 94553-4077
Mailing Address50 Douglas Dr Ste 310Martinez, CA 94553-4003
Phone(925) 957-5110
Fax(925) 646-9595
Organization SubpartYes
Authorized OfficialDavid D. LeeDeputy Cfo · (925) 957-5445
Enumeration DateApril 23, 2007
Last NPPES UpdateOctober 14, 2025
NPPES CertifiedOctober 14, 2025
✔ NPI 1750509162 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyCommunity/Behavioral HealthAgencies
Taxonomy Code251S00000X
Definition
A private or public agency usually under local government jurisdiction, responsible for assuring the delivery of community based mental health, intellectual disabilities, substance abuse and/or behavioral health services to individuals with those disabilities. Services may range from companion care, respite, transportation, community integration, crisis intervention and stabilization, supported employment, day support, prevocational services, residential support, therapeutic and supportive consultation, environmental modifications, intensive in-home therapy and day treatment, in addition to traditional mental health and behavioral treatment.
10 DOUGLAS DR, Martinez, CA 94553
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Other Names 1

Doing Business AsTransitional Services

Other Identifiers 1

Other07HNCA · Dhcs

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Contra Costa County is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

526

Medicare enrollment records show 526 clinicians reassign Medicare billing to Contra Costa County, which bills Medicare for the services they deliver. Of these, 1 practice at this address and 223 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 45

Family Practice118
Psychiatry103
Nurse Practitioner52
Marriage and Family Therapist29
Clinical Social Worker28
Emergency Medicine22
Obstetrics/Gynecology18
Internal Medicine12
37 other specialties144

Nearest to this location (20)

See all 526
Bernd Hansen
Clinical Social Worker
NPI 1609384239
10 DOUGLAS DR
Martinez, CA 94553
(925) 313-1150
✔ PECOS✔ Accepts MedicareSame address
Aesil Cheun, NP
Nurse Practitioner
NPI 1184946741
597 CENTER AVE SUITE 200
Martinez, CA 94553
(925) 765-9247
✔ PECOS0.3 mi
Merrielle Chevalblanc, LCSW
Clinical Social Worker
NPI 1225805021
302 VILLAGE SQ
Orinda, CA 94563
(925) 386-6037
✔ PECOS✔ Accepts Medicare0.6 mi
Jamie Domingos
Marriage and Family Therapist
NPI 1043553118
1340 ARNOLD DR STE 225
Martinez, CA 94553
(925) 655-2411
✔ PECOS0.8 mi
Pyra Aarden, MD
Emergency Medicine
NPI 1417058199
2500 ALHAMBRA AVE CCRMC EMERGENCY DEPARTMENT
Martinez, CA 94553
(925) 370-5973
✔ PECOS1.0 mi
Karen Alingog
Family Practice
NPI 1134312523
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Kevin Beadles, M.D.
Ophthalmology
NPI 1881663714
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5112
✔ PECOS1.0 mi
Judith Bliss
Obstetrics/Gynecology
NPI 1184781064
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Shadi Boutros, DDS
Oral Surgery
NPI 1457489239
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5200
✔ PECOS1.0 mi
Nusrat Chaudhry, MD
Internal Medicine
NPI 1689829004
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5200
✔ PECOS1.0 mi
Darleen Garcia
Dentist
NPI 1417030438
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Imtiaz Ghori
Pediatric Medicine
NPI 1710055215
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Sharon Hiner
Hematology/Oncology
NPI 1891861464
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Anita Ko
Optometry
NPI 1821167321
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Paul Kwok
Anesthesiology
NPI 1295812956
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Esther Kwon, DPM
Podiatry
NPI 1285070565
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5000
✔ PECOS1.0 mi
David Raphael
General Surgery
NPI 1366564486
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Alfeo Reminajes
Psychiatry
NPI 1184848087
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Mark Vanhandel
Neurology
NPI 1477678621
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 370-5110
✔ PECOS1.0 mi
Sherilyn Baughman, MD
Dermatology
NPI 1326108713
2500 ALHAMBRA AVE
Martinez, CA 94553
(925) 957-5429
✔ PECOS1.0 mi
See all 526 clinicians

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

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 Contra Costa County's NPI number?

The NPI number for Contra Costa County is 1750509162. It was assigned to this organization in the NPPES registry on April 23, 2007. The provider is doing business as Transitional Services.

Where is Contra Costa County located?

Contra Costa County is located at 10 Douglas Dr Suite 140, Martinez, CA 94553. The listed phone number is (925) 957-5110.

What is Contra Costa County's specialty?

The primary specialty registered for this NPI is Community/Behavioral Health with taxonomy code 251S00000X.

Is Contra Costa County enrolled in Medicare?

Yes. Contra Costa County is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Contra Costa County?

According to the CMS Revalidation Reassignment List (October 2026 release), 526 clinicians in 45 Medicare specialties reassign their Medicare billing to Contra Costa County. 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 Family Practice (118), Psychiatry (103) and Nurse Practitioner (52). Of these, 1 practice at this address and 223 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Contra Costa County was last updated on October 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 12 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.