Ron Y. Gu, MD
Internal Medicine Physician · Hacienda Heights, CA
Ron Y. Gu, MD is an internal medicine physician with a practice address in Hacienda Heights, California, and NPI 1851494215, issued on Sep 7, 2006. Check the license (California A37924, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Ron Y. Gu
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A37924 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1850 S Azusa Ave, Hacienda Heights, CA 91745
- Phone
- (626) 964-2880
- Enumerated
- Sep 7, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (626) 964-2834
- Medicaid ID
- 00A379240 CA
- Medicare enrollment
- Enrolled (PECOS I20110203000213); accepts Medicare assignment
- Medical or professional school
- National Medical University, 1968
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 1850 S Azusa Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jaw-Huei Chen, MDInternal Medicine Physician1194885384
- Yu Hong Chen, NPPrimary Care Nurse Practitioner1154583896
- Ginger Chu, PA-CPhysician Assistant1598039521
- Joan Dengrove, M.D.Pediatrics Physician1386745347
Verify Ron Y. Gu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A37924Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 84% of the cost of the top drugs
228 Medicare Part D claims for 83 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Arexvy36 claims
- Losartan Potassium24 claims
- Atorvastatin Calcium21 claims
- Amlodipine Besylate16 claims
- Tamsulosin Hcl13 claims
- Boostrix Tdap11 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: $295.79
12 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Colima Medical Clinic PCHacienda Heights, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ron Y. Gu among 17,696 internal medicine physician records in California
Ron Y. Gu, MD is one of 17,696 internal medicine 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1968 · median 2004 among the 11,065 with a school on file
- Record last updated2007 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
10 internal medicine physician records list a practice address in Hacienda Heights
They are 10 of the 597 NPPES records with a practice address in Hacienda Heights, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Hacienda Heights → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- David Aron, MDHacienda Heights, CA 917451346319365
- Anthony Chen, M.D.Hacienda Heights, CA 917451073527099
- Jaw-Huei Chen, MDHacienda Heights, CA 917451194885384
- Show Shan Cherng, M.D.Hacienda Heights, CA 917451801827548
- Edmund Foo, M.D.Hacienda Heights, CA 917451881726354
- Wendy Gu, M.D.Hacienda Heights, CA 917451740579994
- Ray Hsiao, MDHacienda Heights, CA 917451164507869
- William Tzeng, MDHacienda Heights, CA 917451649809385
Common questions
What is Ron Y. Gu, MD's NPI number?
Ron Y. Gu, MD's National Provider Identifier (NPI) is 1851494215, issued on Sep 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ron Y. Gu, MD located?
The NPPES record lists a practice address at 1850 S Azusa Ave, Hacienda Heights, CA, 91745. Phone: (626) 964-2880. Providers update this record themselves, so call before visiting.
How can I verify Ron Y. Gu, MD's license?
NPPES lists California license number A37924, 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 Y. Gu, MD prescribe under Medicare Part D?
In 2024, Ron Y. Gu, MD had 228 Medicare Part D claims for 83 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.