NPPES file of Aug 9, 2026

Thomas Michael Marsella, M.D.

Occupational Medicine Physician · San Francisco, CA

Thomas Michael Marsella, M.D. is an occupational medicine physician with a practice address in San Francisco, California, and NPI 1982716460, issued on Aug 31, 2006. Check the license (California G060434, as entered in NPPES) on the Medical Board of California; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1982716460
Name
Thomas Michael Marsella
Credential
M.D.
Primary taxonomy
Occupational Medicine Physician 2083X0100X
License number
G060434 CA
Self-reported in NPPES; status is on the state search
Practice location
45 Castro St, San Francisco, CA 94114
Phone
(415) 600-5252
Enumerated
Aug 31, 2006
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(415) 600-4646
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest occupational medicine physician records → All 415 in California → Look up another NPI →

Also registered at 45 Castro St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Bernard Alpert, M.D.Specialist1578680450
  2. Ghazi Althubaiti, MDPlastic Surgery Physician1528373735
  3. Wayne Anderson, DONeurology Physician1679559421
  4. Robert Benard, NPAcute Care Nurse Practitioner1184027724
  5. Neil Bhalerao, M.D.Internal Medicine Physician1265872154
  6. Joseph Bou-MerhiPlastic Surgery Physician1831340975

Verify Thomas Michael Marsella in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license G060434    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Thomas Michael Marsella among 415 occupational medicine physician records in California

Thomas Michael Marsella, M.D. is one of 415 occupational medicine physician records with a practice address in California. 30% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 2% of them.

  • NPI issued2006 · 2% of these records are older, 57% newer
  • In a Medicare fileNo · 30% of these records are
  • In the CMS Doctors and Clinicians fileNo · 12% of these records are
  • Record last updated2007 · 75% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2083X0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Occupational Medicine Physician providers in California

There are 415 occupational medicine physician records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 415 in California → Every provider in San Francisco → Occupational Medicine Physician nationwide →

The 8 occupational medicine physician records with the nearest ZIP codes

  1. Ai Chien, M.D.San Francisco, CA 941141316301138
  2. Nancy Wiese, D.O.San Francisco, CA 941141962637918
  3. Ofer Eibschutz, MDSan Francisco, CA 941151366520843
  4. Thomas Herington, MDSan Francisco, CA 941151538297437
  5. Paul Johnson, MDSan Francisco, CA 941151396823993
  6. Robert Kosnik, M.D.San Francisco, CA 941151417982737
  7. Michael Shahbaz, MD, MPHSan Francisco, CA 941151700318458
  8. Christina Wang, MD, MPHSan Francisco, CA 941151447339189

Common questions

What is Thomas Michael Marsella, M.D.'s NPI number?

Thomas Michael Marsella, M.D.'s National Provider Identifier (NPI) is 1982716460, issued on Aug 31, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Thomas Michael Marsella, M.D. located?

The NPPES record lists a practice address at 45 Castro St, San Francisco, CA, 94114. Phone: (415) 600-5252. Providers update this record themselves, so call before visiting.

How can I verify Thomas Michael Marsella, M.D.'s license?

NPPES lists California license number G060434, 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. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.