Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Chelsea Joy Thomsen, MD, MSPH

Individual provider Internal Medicine Physician · NPI 1003227927

Dr. Chelsea Joy Thomsen, MD, MSPH practises Internal Medicine in San Francisco, California. Graduated from University of Arizona College of Medicine in 2014, 12 years ago. Practices with One Medical Group Inc, a 328-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Arizona and California.

Years since qualifying
12
Trained at
University of Arizona College of Medicine
Licensed in
AZ, CA
In the registry since
2014
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

2 W Portal Ave
San Francisco, CA 94127-1304
Phone: (415) 291-0480
Fax: (415) 252-7176
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1998 Market St, San Francisco, CA 94102-6228 — (415) 790-6040

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence A170520 (CA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 50576 (AZ)

Record details

NPI number1003227927
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD , MSPH
Sole proprietorNo
NPI enumeratedMay 13, 2014
Last updated in NPPESMarch 14, 2025
Certification dateMarch 14, 2025

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF ARIZONA COLLEGE OF MEDICINE
Graduated 2014 (12 years in practice)
Group practice One Medical Group Inc — 328 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients73
Services billed 253 a service is one billed item, such as a visit, a test or a procedure
Average patient age72

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at One Medical Group Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 328 clinicians in the practice; 12 are shown here.

Other providers in San Francisco