NPPES file of Aug 9, 2026

Douglas Thierer, DO

Occupational Medicine Physician · South San Francisco, CA

Douglas Thierer, DO is an occupational medicine physician with a practice address in South San Francisco, California, and NPI 1811075468, issued on Nov 1, 2006. Check the license (California 20A6998, 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
1811075468
Name
Douglas Thierer
Credential
DO
Primary taxonomy
Occupational Medicine Physician 2083X0100X
License number
20A6998 CA
Self-reported in NPPES; status is on the state search
Practice location
1200 EL Camino Real, South San Francisco, CA 94080
Phone
(650) 742-2000
Enumerated
Nov 1, 2006
Record last updated
Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicaid ID
00AX69980 CA
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 1200 EL Camino Real

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

  1. Leslie Adams, PHARMDPharmacist1902338486
  2. Kristine Aguirre, RRTRegistered Respiratory Therapist1528539996
  3. Lena AlazzehPhysical Therapist1629739859
  4. Kate AlbeePhysical Therapist1053464495
  5. Jason Anderson, MDHospitalist Physician1831277466
  6. Karl Anderson, MDUrology Physician1700964301

Verify Douglas Thierer in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license 20A6998    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

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Douglas Thierer among 415 occupational medicine physician records in California

Douglas Thierer, DO 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 updated2021 · 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 South San Francisco → Occupational Medicine Physician nationwide →

The 8 occupational medicine physician records with the nearest ZIP codes

  1. David Kaye, DOSouth San Francisco, CA 940801730271040
  2. Lisa Key, MDSouth San Francisco, CA 940801558449165
  3. Sandra Lee, MDSouth San Francisco, CA 940801629128426
  4. Norma Kay Morrison, MDSunnyvale, CA 940861235237991
  5. Myhanh Nguyen, MDSunnyvale, CA 940861518067396
  6. Richard Thompson, M.D.Sunnyvale, CA 940861376641076
  7. Jeffery Hess, M.D., M.S.Sunnyvale, CA 940891790014835
  8. James Boyle, MDRedwood City, CA 940631306924956

Common questions

What is Douglas Thierer, DO's NPI number?

Douglas Thierer, DO's National Provider Identifier (NPI) is 1811075468, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Douglas Thierer, DO located?

The NPPES record lists a practice address at 1200 EL Camino Real, South San Francisco, CA, 94080. Phone: (650) 742-2000. Providers update this record themselves, so call before visiting.

How can I verify Douglas Thierer, DO's license?

NPPES lists California license number 20A6998, 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.