Jonathan I. Diamant, MD
Ophthalmology Physician · Vacaville, CA
Jonathan I. Diamant, MD is an ophthalmology physician with a practice address in Vacaville, California, and NPI 1649358474, issued on Nov 1, 2006. Check the license (California G83886, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jonathan I. Diamant
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- G83886 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1 Quality Dr, Vacaville, CA 95688
- Phone
- (707) 453-5000
- Enumerated
- Nov 1, 2006
- Record last updated
- Dec 13, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20101111000786); accepts Medicare assignment
- Medical or professional school
- Columbia University College Of Physicians And Surgeons, 1993
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 1 Quality Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jonathan I. Diamant in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G83886Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% more Medicare Part D claims than the average ophthalmology physician in 2024
2,397 Medicare Part D claims for 522 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. 20 claims were for opioids.
Most prescribed
- Prednisolone Acetate553 claims
- Latanoprost360 claims
- Dorzolamide-Timolol213 claims
- Brimonidine Tartrate173 claims
- Fluorometholone169 claims
- Valacyclovir103 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: $224.89
2 payments; by number, the most common kind was food and beverage; the largest payer was Genentech USA, Inc. 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
- Permanente Medical Group IncVacaville, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan I. Diamant among 2,899 ophthalmology physician records in California
Jonathan I. Diamant, MD 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 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 45% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated1993 · median 2001 among the 1,907 with a school on file
- Record last updated2021 · 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 Vacaville → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- John Doyle, MDVacaville, CA 956881194803080
- Charles Huang, M.D.Vacaville, CA 956881023080355
- Ellen Kolarik, MDVacaville, CA 956881326110131
- Douglas Beernink, MDCameron Park, CA 956821992883656
- Carmine Cammarosano, M.D.Woodland, CA 956951811913205
- Yilin Chu, M.D.Woodland, CA 956951659394179
- Filbert Nguyen, MDWoodland, CA 956951437443983
- Jonathan Perlman, MDWoodland, CA 956951972510477
Common questions
What is Jonathan I. Diamant, MD's NPI number?
Jonathan I. Diamant, MD's National Provider Identifier (NPI) is 1649358474, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan I. Diamant, MD located?
The NPPES record lists a practice address at 1 Quality Dr, Vacaville, CA, 95688. Phone: (707) 453-5000. Providers update this record themselves, so call before visiting.
How can I verify Jonathan I. Diamant, MD's license?
NPPES lists California license number G83886, 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 Jonathan I. Diamant, MD prescribe under Medicare Part D?
In 2024, Jonathan I. Diamant, MD had 2,397 Medicare Part D claims for 522 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.