Ron Gutmark, MD
Ophthalmology Physician · Glendora, CA
Ron Gutmark, MD is an ophthalmology physician with a practice address in Glendora, California, and NPI 1609189893, issued on Jul 16, 2010. Check the license (California A129409, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ron Gutmark
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- A129409 CA
P25846 MD
4301106769 MI
MD447468 PA
Self-reported in NPPES; status is on the state search - Practice location
- 210 S Grand Ave, Glendora, CA 91741
- Phone
- (626) 335-0535
- Enumerated
- Jul 16, 2010
- Record last updated
- Jun 29, 2016 (not updated in 10 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 210 S Grand Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Mariam Arnouk, RDH, DMDDentist1740684562
- Jacqueline Bracy, M.D.Obstetrics & Gynecology Physician1396806253
- Sara DennisClinical Psychologist1790980506
- Janet Fermin, MDPediatrics Physician1891771143
- Richard Forgey, O.D.Optometrist1760555361
- Brian Gwartz, M.D.Pain Medicine (Anesthesiology) Physician1619095247
Verify Ron Gutmark in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A129409Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
89% more Medicare Part D claims than the average ophthalmology physician in 2024
2,865 Medicare Part D claims for 822 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 47% of claims.
Most prescribed
- Latanoprost674 claims
- Prednisolone Acetate299 claims
- Moxifloxacin242 claims
- Ketorolac Tromethamine226 claims
- Dorzolamide-Timolol220 claims
- Timolol Maleate123 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: $823.30
46 payments; by number, the most common kind was food and beverage; the largest payer was Amgen 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.
Ron Gutmark among 2,899 ophthalmology physician records in California
Ron Gutmark, 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 2010, is newer than 74% of them.
- NPI issued2010 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 66% of these records are
- Record last updated2016 · 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 Glendora → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Antoine GarabetGlendora, CA 917411871977645
- Mark Kislinger, M.D.Glendora, CA 917411477733772
- Vicky Pai, M.D.Glendora, CA 917411740485895
- Kenneth York, M.D.Glendora, CA 917411396819983
- Jose Briones, MDGlendora, CA 917401508859828
- Abraham Shammas, MDGlendora, CA 917401407030075
- Garlan Lo, M.D.Hacienda Heights, CA 917451043276140
- Danielle Lo, M.D.Hacienda Heights, CA 917451164878948
Common questions
What is Ron Gutmark, MD's NPI number?
Ron Gutmark, MD's National Provider Identifier (NPI) is 1609189893, issued on Jul 16, 2010. An NPI identifies a provider in billing; it is not a license.
Where is Ron Gutmark, MD located?
The NPPES record lists a practice address at 210 S Grand Ave, Glendora, CA, 91741. Phone: (626) 335-0535. Providers update this record themselves, so call before visiting.
How can I verify Ron Gutmark, MD's license?
NPPES lists California license number A129409, 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 Ron Gutmark, MD prescribe under Medicare Part D?
In 2024, Ron Gutmark, MD had 2,865 Medicare Part D claims for 822 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.