Ann Leu Thomas, M.D., M.S.
Ophthalmology Physician · Fairfield, CA
Ann Leu Thomas, M.D., M.S. is an ophthalmology physician with a practice address in Fairfield, California, and NPI 1275910291, issued on Apr 28, 2015. Check the license (California A145330, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ann Leu Thomas
- Credential
- M.D., M.S.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- A145330 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2702 Low CT, Fairfield, CA 94534
- Phone
- (707) 427-4900
- Enumerated
- Apr 28, 2015
- Record last updated
- Jul 22, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20200127001682); accepts Medicare assignment
- Medical or professional school
- Washington University School Of Medicine, 2015
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 2702 Low CT
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mina AfnanPhysician Assistant1023889672
- Kareen Caragan, P.T.Physical Therapist1750462982
- Charo Castro, PTAPhysical Therapy Assistant1881775013
- Lawrence Chan, M.D.Gastroenterology Physician1356558332
- Julie Chen, M.D.Ophthalmology Physician1740303064
- Martha Corcoran, M.D.Otolaryngology Physician1063487825
Verify Ann Leu Thomas in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A145330Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average ophthalmology physician in 2024
1,501 Medicare Part D claims for 423 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 42% of claims.
Most prescribed
- Latanoprost397 claims
- Prednisolone Acetate204 claims
- Dorzolamide-Timolol128 claims
- Timolol Maleate116 claims
- Brimonidine Tartrate100 claims
- Erythromycin79 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: $187.59
3 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 13,221 providers of this specialty with any payment received $4,535.02 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.
Bills Medicare through one group practice
- Sutter Valley Medical FoundationVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ann Leu Thomas among 2,899 ophthalmology physician records in California
Ann Leu Thomas, M.D., M.S. is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2015, is newer than 84% of them.
- NPI issued2015 · 84% of these records are older, 14% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2015 · median 2001 among the 1,907 with a school on file
- Record last updated2020 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Fairfield → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Julie Chen, M.D.Fairfield, CA 945341740303064
- Charles Crosson, M.D.Fairfield, CA 945341659384410
- Donna Hinman-Seabrooks, M.D.Fairfield, CA 945341285722181
- Emilee Amacker, MDTravis Afb, CA 945351710484001
- Charles Crapotta, MDFairfield, CA 945331932108362
- Joseph Giovannini, M.D.Travis Afb, CA 945351083679542
- James Hartley, M.D.Travis Afb, CA 945351023220423
- Frank Hull, MDFairfield, CA 945331720071327
Common questions
What is Ann Leu Thomas, M.D., M.S.'s NPI number?
Ann Leu Thomas, M.D., M.S.'s National Provider Identifier (NPI) is 1275910291, issued on Apr 28, 2015. An NPI identifies a provider in billing; it is not a license.
Where is Ann Leu Thomas, M.D., M.S. located?
The NPPES record lists a practice address at 2702 Low CT, Fairfield, CA, 94534. Phone: (707) 427-4900. Providers update this record themselves, so call before visiting.
How can I verify Ann Leu Thomas, M.D., M.S.'s license?
NPPES lists California license number A145330, 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 Ann Leu Thomas, M.D., M.S. prescribe under Medicare Part D?
In 2024, Ann Leu Thomas, M.D., M.S. had 1,501 Medicare Part D claims for 423 beneficiaries; the average among ophthalmology physician prescribers was 1,518. 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.