Irene Riley Sung, M.D.
Family Medicine Physician · Claremont, CA
Irene Riley Sung, M.D. is a family medicine physician with a practice address in Claremont, California, and NPI 1720514185, issued on May 4, 2017. Check the license (California A166573, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Irene Riley Sung
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A166573 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1601 Monte Vista Ave Ste 190, Claremont, CA 91711
- Phone
- (909) 865-9977
- Enumerated
- May 4, 2017
- Record last updated
- Jul 15, 2022
- Fax
- (909) 469-2109
- Medicaid ID
- 1720514185 CA
- Medicare enrollment
- Enrolled (PECOS I20201210001452); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 1601 Monte Vista Ave Ste 190
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Javier Chang, M.D.Family Medicine Physician1558565366
- Nicholas ChiangPhysician Assistant1245729391
- Darren Favela, PA-CPhysician Assistant1265164644
- Jennifer Guerra, MSPA-CPhysician Assistant1831425875
Verify Irene Riley Sung in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A166573Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
96% fewer Medicare Part D claims than the average family medicine physician in 2024
149 Medicare Part D claims for 120 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Amoxicillin-Clavulanate Potass15 claims
- Cephalexin15 claims
- Azithromycin12 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.
Bills Medicare through one group practice
- The Regents OF The University OF CaliforniaLos Angeles, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Irene Riley Sung among 17,133 family medicine physician records in California
Irene Riley Sung, M.D. is one of 17,133 family medicine physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 79% of them.
- NPI issued2017 · 79% of these records are older, 18% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2016 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
34 family medicine physician records list a practice address in Claremont
They are 34 of the 800 NPPES records with a practice address in Claremont, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Claremont → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Alan Bergen, M.D.Claremont, CA 917111700022118
- Javier Chang, M.D.Claremont, CA 917111558565366
- Jennie Ho, M.D.Claremont, CA 917111013082403
- Lester Holstein, MDClaremont, CA 917111720088792
- Robyn Jacoby, DOClaremont, CA 917111487623575
- Mary Kasem, MDClaremont, CA 917111982639993
- Yen Lai, MDClaremont, CA 917111033110671
- Paul Orr, M.D.Claremont, CA 917111417950221
Common questions
What is Irene Riley Sung, M.D.'s NPI number?
Irene Riley Sung, M.D.'s National Provider Identifier (NPI) is 1720514185, issued on May 4, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Irene Riley Sung, M.D. located?
The NPPES record lists a practice address at 1601 Monte Vista Ave Ste 190, Claremont, CA, 91711. Phone: (909) 865-9977. Providers update this record themselves, so call before visiting.
How can I verify Irene Riley Sung, M.D.'s license?
NPPES lists California license number A166573, 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 Irene Riley Sung, M.D. prescribe under Medicare Part D?
In 2024, Irene Riley Sung, M.D. had 149 Medicare Part D claims for 120 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.