Thomas P. Twaddell, M.D.
Gastroenterology Physician · San Francisco, CA
Thomas P. Twaddell, M.D. is a gastroenterology physician with a practice address in San Francisco, California, and NPI 1760751176, issued on Dec 14, 2011. Check the license (California CFE28737, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas P. Twaddell
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- CFE28737 CA
Self-reported in NPPES; status is on the state search - Practice location
- 600 Duncan St, San Francisco, CA 94131
- Phone
- (415) 206-9293
- Enumerated
- Dec 14, 2011
- Record last updated
- Feb 28, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (415) 206-9293
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 2,140 in California → Look up another NPI →
Verify Thomas P. Twaddell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license CFE28737Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average gastroenterology physician in 2024
34 Medicare Part D claims, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 32% of claims.
Most prescribed
- Eliquis11 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Thomas P. Twaddell among 2,140 gastroenterology physician records in California
Thomas P. Twaddell, M.D. is one of 2,140 gastroenterology physician records with a practice address in California. 83% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2011, is newer than 74% of them.
- NPI issued2011 · 74% of these records are older, 23% newer
- In a Medicare fileYes · 83% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2013 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in California
There are 2,140 gastroenterology physician records in California.
All 2,140 in California → Every provider in San Francisco → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Gregory Fung, MDSan Francisco, CA 941331700970795
- James Yan, D.O.San Francisco, CA 941331588683890
- Annsa Huang, MDSan Francisco, CA 941211861881658
- Kenneth McQuaid, M.D.San Francisco, CA 941211497781009
- Robert Owen, M.D.San Francisco, CA 941211639111628
- James Ryan, M.D.San Francisco, CA 941211245310275
- Martin Spitz, M.D.San Francisco, CA 941211871578021
- John Cello, MDSan Francisco, CA 941431346205168
Common questions
What is Thomas P. Twaddell, M.D.'s NPI number?
Thomas P. Twaddell, M.D.'s National Provider Identifier (NPI) is 1760751176, issued on Dec 14, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Thomas P. Twaddell, M.D. located?
The NPPES record lists a practice address at 600 Duncan St, San Francisco, CA, 94131. Phone: (415) 206-9293. Providers update this record themselves, so call before visiting.
How can I verify Thomas P. Twaddell, M.D.'s license?
NPPES lists California license number CFE28737, 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.
How much does Thomas P. Twaddell, M.D. prescribe under Medicare Part D?
In 2024, Thomas P. Twaddell, M.D. had 34 Medicare Part D claims; the average among gastroenterology physician prescribers was 811. Part D covers Medicare prescriptions only.
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.