DR. LARISSA R THOMAS MD
NPI 1508192873
Internal Medicine in San Francisco, CA
About Dr. Larissa R Thomas Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. LARISSA R THOMAS MD (NPI 1508192873) is an individual internal medicine provider in San Francisco, California, licensed in California (A111841) and active in the NPI registry since October 2009. She is enrolled in Medicare PECOS and is a graduate of Emory University School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Larissa R Thomas Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Larissa Thomas reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94110
- Reassigned Medicare billing, California enrollment
- 637 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.
Areas of Expertise CMS Part B claims 3
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
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.
SAN FRANCISCO, CA 94110
SAN FRANCISCO, CA 94110
SAN FRANCISCO, CA 94110
SAN FRANCISCO, CA 94110
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 Larissa Thomas's NPI number?
The NPI number for Larissa Thomas is 1508192873. It was assigned to this individual provider in the NPPES registry on October 21, 2009.
Where is Larissa Thomas located?
Larissa Thomas practices at 1001 Potrero Ave, San Francisco, CA 94110. The listed phone number is (415) 206-8000.
What is Larissa Thomas's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Larissa Thomas enrolled in Medicare?
Yes. Larissa Thomas is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Larissa Thomas's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Larissa Thomas reassigns Medicare benefits to University Of California Sfgh Medical Group (San Francisco, CA). The 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 Larissa 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 Larissa Thomas was last updated on July 10, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years 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.
# Dr. Larissa R Thomas, MD · NPI 1508192873
Internal Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since October 21, 2009.
## Identity
- **NPI:** 1508192873 (Entity type: Individual)
- **Enumerated:** October 21, 2009
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A111841 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1001 POTRERO AVE, San Francisco, CA 94110-3518
- **Phone:** (415) 206-8000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** University Of California Sfgh Medical Group (NPI 1073836060, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Emory University School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** July 10, 2023
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Source: [NPI Profile](https://npiprofile.com/npi/1508192873) · Data from the CMS NPPES public registry.