Carol J. Thomas, MD
Endocrinology, Diabetes & Metabolism Physician · Palo Alto, CA
Carol J. Thomas, MD is an endocrinology, diabetes & metabolism physician with a practice address in Palo Alto, California, and NPI 1861591455, issued on Sep 21, 2006. Check the license (California G380670, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Carol J. Thomas
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- G380670 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1101 Welch Road, Palo Alto, CA 94304
- Phone
- (650) 326-8700
- Enumerated
- Sep 21, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (650) 853-0560
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 1,131 in California → Look up another NPI →
Verify Carol J. Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G380670Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
1,245 Medicare Part D claims for 84 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
- Synthroid66 claims
- Mounjaro59 claims
- Rosuvastatin Calcium57 claims
- Levothyroxine Sodium47 claims
- Gabapentin38 claims
- Metformin Hcl Er38 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.
Industry payments in 2024: $49.53
2 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Carol J. Thomas among 1,131 endocrinology, diabetes & metabolism physician records in California
Carol J. Thomas, MD is one of 1,131 endocrinology, diabetes & metabolism 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 2006, is newer than 5% of them.
- NPI issued2006 · 5% of these records are older, 54% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileNo · 69% of these records are
- Record last updated2007 · 57% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in California
There are 1,131 endocrinology, diabetes & metabolism physician records in California.
All 1,131 in California → Every provider in Palo Alto → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Kaniksha Desai, MDPalo Alto, CA 943041316266778
- Dimpi Nitin Desai, MDPalo Alto, CA 943041780060699
- Chrysoula Dosiou, MDPalo Alto, CA 943041508992769
- Elizabeth Fraze, MDPalo Alto, CA 943041700951092
- Shilpa Jain, M.D.Palo Alto, CA 943041851369847
- Elisabeth Ryzen, M.D.Palo Alto, CA 943041992745707
- Justin Annes, M.D.Stanford, CA 943051013027424
- Marina Basina, MDStanford, CA 943051023196805
Common questions
What is Carol J. Thomas, MD's NPI number?
Carol J. Thomas, MD's National Provider Identifier (NPI) is 1861591455, issued on Sep 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Carol J. Thomas, MD located?
The NPPES record lists a practice address at 1101 Welch Road, Palo Alto, CA, 94304. Phone: (650) 326-8700. Providers update this record themselves, so call before visiting.
How can I verify Carol J. Thomas, MD's license?
NPPES lists California license number G380670, 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 Carol J. Thomas, MD prescribe under Medicare Part D?
In 2024, Carol J. Thomas, MD had 1,245 Medicare Part D claims for 84 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.