Dr Chelsea Joy Thomsen, MD, MSPH - Medicare Internal Medicine in San Francisco, CA

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Dr Chelsea Joy Thomsen, MD, MSPH is a medicare enrolled "Internal Medicine" physician in San Francisco, California. She went to University Of Arizona College Of Medicine and graduated in 2014 and has 10 years of diverse experience with area of expertise as Internal Medicine. She is a member of the group practice One Medical Group Inc and her current practice location is 2 W Portal Ave, San Francisco, California. You can reach out to her office (for appointments etc.) via phone at (415) 291-0480.

Dr Chelsea Joy Thomsen is licensed to practice in California (license number A170520) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1003227927.

Contact Information

Dr Chelsea Joy Thomsen, MD, MSPH
2 W Portal Ave,
San Francisco, CA 94127-1304
(415) 291-0480
Not Available

Map and Direction




Physician's Profile

Full NameDr Chelsea Joy Thomsen
GenderFemale
SpecialityInternal Medicine
Experience10 Years
Location2 W Portal Ave, San Francisco, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Chelsea Joy Thomsen attended and graduated from University Of Arizona College Of Medicine in 2014
  NPI Data:
  • NPI Number: 1003227927
  • Provider Enumeration Date: 05/13/2014
  • Last Update Date: 03/15/2023
  Medicare PECOS Information:
  • PECOS PAC ID: 7810116662
  • Enrollment ID: I20211213001196

Medical Identifiers

Medical identifiers for Dr Chelsea Joy Thomsen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1003227927NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine 50576 (Arizona)Secondary
207R00000XInternal Medicine A170520 (California)Primary

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
One Medical Group Inc2567623739272

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Chelsea Joy Thomsen allows following entities to bill medicare on her behalf.
Entity NameOne Medical Group Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1467781641
PECOS PAC ID: 2567623739
Enrollment ID: O20120416000113
Entity NameCarbon Health Medical Group Of California Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1417294232
PECOS PAC ID: 9032340047
Enrollment ID: O20140314001276
Entity NameCarbon Health Primary Care Of California Pc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1972057990
PECOS PAC ID: 8628350626
Enrollment ID: O20170127001216

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Chelsea Joy Thomsen is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Chelsea Joy Thomsen, MD, MSPH
1 Embarcadero Ctr Ste 1900,
San Francisco, CA 94111-3723

Ph: (415) 658-6791		Dr Chelsea Joy Thomsen, MD, MSPH
2 W Portal Ave,
San Francisco, CA 94127-1304

Ph: (415) 291-0480

Reviews and Comments


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Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.