MS. KAREN LISA THOMAS LCSW
NPI 1003015835
Social Worker - Clinical in Oakland, CA
About Ms. Karen Lisa Thomas Lcsw NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MS. KAREN LISA THOMAS LCSW (NPI 1003015835) is an individual clinical provider in Oakland, California, licensed in California (LCSW23037) and active in the NPI registry since July 2007. She is enrolled in Medicare PECOS, maintains a secondary practice location in Oakland, and is a graduate of Other (1992).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Ms. Karen Lisa Thomas Lcsw is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
4Medicare enrollment records show Karen Thomas reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 1,159 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94609 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
OAKLAND, CA 94609
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 Karen Thomas's NPI number?
The NPI number for Karen Thomas is 1003015835. It was assigned to this individual provider in the NPPES registry on July 12, 2007.
Where is Karen Thomas located?
Karen Thomas practices at 770 53rd St, Oakland, CA 94609. The listed phone number is (510) 428-3885.
What is Karen Thomas's specialty?
The primary specialty registered for this NPI is Social Worker, specializing in Clinical, with taxonomy code 1041C0700X.
Is Karen Thomas enrolled in Medicare?
Yes. Karen Thomas is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Karen Thomas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Karen Thomas reassigns Medicare benefits to 4 organizations: Regents Of The University Of California (San Francisco, CA), University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and Ucsf Pediatrics Associates (San Francisco, CA). Each 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 Karen Thomas's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Karen Thomas was last updated on April 30, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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.
# Ms. Karen Lisa Thomas, LCSW · NPI 1003015835
Clinical provider in Oakland, California. Individual provider, active in the CMS NPPES registry since July 12, 2007.
## Identity
- **NPI:** 1003015835 (Entity type: Individual)
- **Enumerated:** July 12, 2007
- **Primary specialty:** Social Worker - Clinical · taxonomy 1041C0700X
- **State license:** LCSW23037 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 770 53RD ST, Oakland, CA 94609-1814
- **Phone:** (510) 428-3885
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment
- **Bills Medicare through:** 4 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1235322348, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); Ucsf Pediatrics Associates (NPI 1376614016, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 1992
## Record status
- **NPPES last updated:** April 30, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1003015835) · Data from the CMS NPPES public registry.