Hee Yong Oh, M.D.
Internal Medicine Physician · West Covina, CA
Hee Yong Oh, M.D. is an internal medicine physician with a practice address in West Covina, California, and NPI 1225106693, issued on Dec 1, 2006. Check the license (California CG258Y, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Hee Yong Oh
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- CG258Y CA
Self-reported in NPPES; status is on the state search - Practice location
- 1433 W Merced Ave Ste 207, West Covina, CA 91790
- Phone
- (626) 962-2421
- Enumerated
- Dec 1, 2006
- Record last updated
- Dec 16, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (626) 962-8345
- Medicaid IDs
- 00A343520 CA
00CG258Y0 CA - Medicare enrollment
- Enrolled (PECOS I20091007000343); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Verify Hee Yong Oh in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license CG258YCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% more Medicare Part D claims than the average internal medicine physician in 2024
3,489 Medicare Part D claims for 335 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 55 claims were for opioids.
Most prescribed
- Atorvastatin Calcium302 claims
- Losartan Potassium213 claims
- Amlodipine Besylate176 claims
- Tamsulosin Hcl175 claims
- Omeprazole111 claims
- Metformin Hcl102 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: $1,231.08
26 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. 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
- Hee Yong OH MD IncRowland Heights, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Hee Yong Oh among 17,696 internal medicine physician records in California
Hee Yong Oh, M.D. 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 updated2011 · 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).
23 internal medicine physician records list a practice address in West Covina
They are 23 of the 2,450 NPPES records with a practice address in West Covina, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in West Covina → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Amitabh Chauhan, M.D.West Covina, CA 917901619925948
- Johny Cu, MDWest Covina, CA 917901336223569
- Seung Sue Cua, MDWest Covina, CA 917901063513661
- Ziad Dabuni, M.D.West Covina, CA 917901851349187
- Lina Dela Cruz, MDWest Covina, CA 917901952489858
- Anil Gupta, MDWest Covina, CA 917901538182407
- Cesar Jimenez, MDWest Covina, CA 917901114099942
- Ruth Karunananthan, M.D.West Covina, CA 917901922057256
Common questions
What is Hee Yong Oh, M.D.'s NPI number?
Hee Yong Oh, M.D.'s National Provider Identifier (NPI) is 1225106693, issued on Dec 1, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Hee Yong Oh, M.D. located?
The NPPES record lists a practice address at 1433 W Merced Ave Ste 207, West Covina, CA, 91790. Phone: (626) 962-2421. Providers update this record themselves, so call before visiting.
How can I verify Hee Yong Oh, M.D.'s license?
NPPES lists California license number CG258Y, 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 Hee Yong Oh, M.D. prescribe under Medicare Part D?
In 2024, Hee Yong Oh, M.D. had 3,489 Medicare Part D claims for 335 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.