Dean Thorsen
Anesthesiology Physician · San Francisco, CA
Dean Thorsen is an anesthesiology physician with a practice address in San Francisco, California, and NPI 1023468220, issued on Jun 17, 2016. Check the license (California 20A17232, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Dean Thorsen
- Primary taxonomy
- Anesthesiology Physician 207L00000X
- License numbers
- 20A17232 CA
2016020425 MO
Self-reported in NPPES; status is on the state search - Practice location
- 1975 4TH St, San Francisco, CA 94143
- Phone
- (415) 476-1000
- Enumerated
- Jun 17, 2016
- Record last updated
- Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210303001530); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest anesthesiology physician records → All 7,571 in California → Look up another NPI →
Also registered at 1975 4TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Dean Thorsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A17232Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Permanente Medical Group IncVallejo, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Dean Thorsen among 7,571 anesthesiology physician records in California
Dean Thorsen is one of 7,571 anesthesiology physician records with a practice address in California. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 80% of them.
- NPI issued2016 · 80% of these records are older, 17% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated2016 · median 2006 among the 4,868 with a school on file
- Record last updated2021 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207L00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
499 anesthesiology physician records list a practice address in San Francisco
They are 499 of the 38,143 NPPES records with a practice address in San Francisco, and 7,571 anesthesiology physician records in California.
All 7,571 in California → Every provider in San Francisco → Anesthesiology Physician nationwide →
The 8 anesthesiology physician records with the nearest ZIP codes
- Philip Bickler, MDSan Francisco, CA 941431245295450
- Ronald Braun, M.D.San Francisco, CA 941431700865367
- Neal Cohen, MDSan Francisco, CA 941431790740504
- Helge Eilers, MDSan Francisco, CA 941431134182884
- Adrian Gelb, MDSan Francisco, CA 941431568427185
- Michael Gropper, MDSan Francisco, CA 941431699730416
- Jeffrey Katz, MDSan Francisco, CA 941431295790913
- Terry Kim, MDSan Francisco, CA 941431972578524
Common questions
What is Dean Thorsen's NPI number?
Dean Thorsen's National Provider Identifier (NPI) is 1023468220, issued on Jun 17, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Dean Thorsen located?
The NPPES record lists a practice address at 1975 4TH St, San Francisco, CA, 94143. Phone: (415) 476-1000. Providers update this record themselves, so call before visiting.
How can I verify Dean Thorsen's license?
NPPES lists California license number 20A17232, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.