Thomas C. Williams, M.D.
Pulmonary Disease Physician · Oakland, CA
Thomas C. Williams, M.D. is a pulmonary disease physician with a practice address in Oakland, California, and NPI 1619004967, issued on Feb 27, 2007. Check the license (California G32747, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Thomas C. Williams
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- G32747 CA
Self-reported in NPPES; status is on the state search - Practice location
- 642 Mandana Blvd, Oakland, CA 94610
- Phone
- (510) 504-1226
- Enumerated
- Feb 27, 2007
- Record last updated
- Mar 31, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 00G327471 CA
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 1,443 in California → Look up another NPI →
Verify Thomas C. Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G32747Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average pulmonary disease physician in 2024
20 Medicare Part D claims, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D.
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 C. Williams among 1,443 pulmonary disease physician records in California
Thomas C. Williams, M.D. is one of 1,443 pulmonary disease physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 49% of them.
- NPI issued2007 · 49% of these records are older, 40% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 74% of these records are
- Record last updated2021 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in California
There are 1,443 pulmonary disease physician records in California.
All 1,443 in California → Every provider in Oakland → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Vidhya Balasubramanian, M.D.Oakland, CA 946091972705457
- Leland Dobbs, M.D.Oakland, CA 946091760422356
- Justin Dumouchel, M.D.Oakland, CA 946091508050212
- Barry Horn, M.D.Oakland, CA 946091316989445
- Elena Kennedy, MDOakland, CA 946111104280833
- Kristina Kury, M.D.Oakland, CA 946091154357713
- Andrew McClintock Greenberg, M.D., PHD.Oakland, CA 946091861432403
- James McFeely, M.D.Oakland, CA 946091073542684
Common questions
What is Thomas C. Williams, M.D.'s NPI number?
Thomas C. Williams, M.D.'s National Provider Identifier (NPI) is 1619004967, issued on Feb 27, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Thomas C. Williams, M.D. located?
The NPPES record lists a practice address at 642 Mandana Blvd, Oakland, CA, 94610. Phone: (510) 504-1226. Providers update this record themselves, so call before visiting.
How can I verify Thomas C. Williams, M.D.'s license?
NPPES lists California license number G32747, 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 C. Williams, M.D. prescribe under Medicare Part D?
In 2024, Thomas C. Williams, M.D. had 20 Medicare Part D claims; the average among pulmonary disease physician prescribers was 1,425. 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.