Ron Gutmark, MD
Internal Medicine Physician · Glendora, CA
Ron Gutmark, MD is an internal medicine 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
- Internal Medicine Physician 207R00000X
- 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
- Entity
- Type 1 · individual
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, DMDDental Hygienist1740684562
- 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
3% more Medicare Part D claims than the average internal medicine physician in 2024
2,865 Medicare Part D claims for 822 beneficiaries, against an average of 2,785 among the 127,794 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, mostly food and beverage; the largest payer was Amgen Inc.. The 65,274 providers of this specialty with any payment received $2,536.66 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.
13 internal medicine physician records list a Glendora practice address
They are 13 of the 921 NPPES records with a Glendora practice address, and 20,403 internal medicine physician records in California.
All 13 in Glendora → All 20,403 in California → Every provider in Glendora →
Other internal medicine physician records in California
- Jacob Aaron, MDSan Francisco, CA1407202518
- Alistair Aaronson, MDStanford, CA1457628760
- Jose Abad., MDSacramento, CA1144607219
- Donna Abare, MDOakland, CA1386722155
- Marce AbareScotts Valley, CA1457744708
- Samuel Abarte, M.D.Chula Vista, CA1578535498
- Alexander Abary, MDLong Beach, CA1104995919
- Luba Abascal, MDSan Francisco, CA1023180874
- Michael Abate, MDSacramento, CA1548248131
- Wali Abawi, D.O.Joshua Tree, CA1104362268
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 internal medicine physician prescribers was 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.