Sy H. Oang, D.O.
Internal Medicine Physician · Whittier, CA
Sy H. Oang, D.O. is an internal medicine physician with a practice address in Whittier, California, and NPI 1972692937, issued on Oct 11, 2006. Check the license (California 20A6673, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sy H. Oang
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20A6673 CA
Self-reported in NPPES; status is on the state search - Practice location
- 15725 E Whittier Blvd, Whittier, CA 90603
- Phone
- (562) 947-8478
- Enumerated
- Oct 11, 2006
- Record last updated
- Mar 13, 2008 (not updated in 18 years: call before relying on the address or phone)
- Fax
- (562) 943-1090
- Medicare enrollment
- Enrolled (PECOS I20090619000539); accepts Medicare assignment
- Medical or professional school
- Michigan State University College Of Osteopathic Medicine, 1991
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 15725 E Whittier Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maximo Ibarra, P.A.Medical Physician Assistant1366641425
- Selina Lee, P.A.Medical Physician Assistant1710173984
- Mark Magged, M.D.Family Medicine Physician1417045436
- Keith Miyamoto, M.D.Pediatrics Physician1194814152
- Hany Nashed, M.D.Pediatrics Physician1245329200
- Bharat Patel, M.D.Internal Medicine Physician1265517817
Verify Sy H. Oang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A6673Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.7 times the Medicare Part D claims of the average internal medicine physician in 2024
8,658 Medicare Part D claims for 654 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 86 claims were for opioids.
Most prescribed
- Atorvastatin Calcium509 claims
- Amlodipine Besylate406 claims
- Rosuvastatin Calcium403 claims
- Levothyroxine Sodium363 claims
- Losartan Potassium299 claims
- Simvastatin253 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 76.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Pih Health PhysiciansLa Mirada, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sy H. Oang among 17,696 internal medicine physician records in California
Sy H. Oang, D.O. 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
- Graduated1991 · median 2004 among the 11,065 with a school on file
- Record last updated2008 · 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).
49 internal medicine physician records list a practice address in Whittier
They are 49 of the 2,836 NPPES records with a practice address in Whittier, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Whittier → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Roshel Graham, M.D.Whittier, CA 906031891056388
- Sarvesh Parikh, M.D.Whittier, CA 906031932357936
- Bharat Patel, M.D.Whittier, CA 906031265517817
- William Wang, D.O.Whittier, CA 906031508213646
- Anas Abu-Khader, MDWhittier, CA 906021881180784
- Helen Hanna, M.D.Whittier, CA 906021174054639
- Charles Hu, D.O.Whittier, CA 906021699038042
- Phyu Huang, MDWhittier, CA 906021306243597
Common questions
What is Sy H. Oang, D.O.'s NPI number?
Sy H. Oang, D.O.'s National Provider Identifier (NPI) is 1972692937, issued on Oct 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Sy H. Oang, D.O. located?
The NPPES record lists a practice address at 15725 E Whittier Blvd, Whittier, CA, 90603. Phone: (562) 947-8478. Providers update this record themselves, so call before visiting.
How can I verify Sy H. Oang, D.O.'s license?
NPPES lists California license number 20A6673, 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 Sy H. Oang, D.O. prescribe under Medicare Part D?
In 2024, Sy H. Oang, D.O. had 8,658 Medicare Part D claims for 654 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Sy H. Oang, D.O.'s MIPS final score?
The 2023 MIPS final score is 76.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.