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

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



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

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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

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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

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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

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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

News Archive

New study: Poor pharmaceutical communication with Hispanic patients affect quality of care

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Internal Medicine Doctors in San Francisco, CA

Dr. Pratyusha Kishore Narra, MBBS
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 3490 California St, San Francisco, CA 94118
Phone: 415-514-6200    Fax: 415-514-6410
Christine Soran,
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 1001 Potrero Ave, Bldg 10, 3rd Floor, Ward 13, Ucsf Division Of General Internal Medicine Sfgh, San Francisco, CA 94110
Phone: 415-206-5164    Fax: 415-206-5586
Stephen Norris Cohen, MD
Internal Medicine
Medicare: Not Enrolled in Medicare
Practice Location: 40 Ventura Ave, San Francisco, CA 94116
Phone: 415-681-2171    Fax: 415-681-2171
Mauricio Jalife Bucay, M.D
Internal Medicine
Medicare: Accepting Medicare Assignments
Practice Location: 505 Parnassus Ave, San Francisco, CA 94143
Phone: 415-750-4994    Fax: 415-750-8156
Dr. Adriana A.t. Martin, M.D., PH.D.
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 505 Parnassus Ave, San Francisco, CA 94143
Phone: 415-514-7288    
Dr. Alexandra Cristina Villasante Fricke, MD
Internal Medicine
Medicare: Medicare Enrolled
Practice Location: 655 Montgomery St Ste 810, San Francisco, CA 94111
Phone: 844-847-8216    Fax: 415-520-9150

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