Jonathan S. Chien, M.D.
Internal Medicine Physician · Montebello, CA
Jonathan S. Chien, M.D. is an internal medicine physician with a practice address in Montebello, California, and NPI 1558327270, issued on Apr 21, 2006. Check the license (California A50095, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jonathan S. Chien
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A50095 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2603 Via Campo, Montebello, CA 90640
- Phone
- (323) 720-1144
- Enumerated
- Apr 21, 2006
- Record last updated
- Dec 8, 2025
- Fax
- (323) 888-2776
- Medicare enrollment
- Enrolled (PECOS I20120516000293); 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 →
Also registered at 2603 Via Campo
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jacqueline Borjas, MSN, AGPCNP-CPrimary Care Nurse Practitioner1538901491
- Maribeth Ching, M.D.Family Medicine Physician1982651477
- Robert Drummond, MD, PHDInternal Medicine Physician1770887481
- Angelina Espinoza-Lopez, MDInternal Medicine Physician1144315565
- Carlos Millan Espinoza, MDFamily Medicine Physician1821528019
Verify Jonathan S. Chien in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A50095Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.2 times the Medicare Part D claims of the average internal medicine physician in 2024
6,864 Medicare Part D claims for 515 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims. 61 claims were for opioids.
Most prescribed
- Atorvastatin Calcium522 claims
- Amlodipine Besylate355 claims
- Metformin Hcl284 claims
- Lisinopril281 claims
- Tamsulosin Hcl254 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.
Bills Medicare through one group practice
- Healthcare Partners Affiliates Medical GroupMontebello, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan S. Chien among 17,696 internal medicine physician records in California
Jonathan S. Chien, 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
- Graduated1980 · median 2004 among the 11,065 with a school on file
- Record last updated2025 · 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).
25 internal medicine physician records list a practice address in Montebello
They are 25 of the 728 NPPES records with a practice address in Montebello, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Montebello → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Olga Alarid, M.D.Montebello, CA 906401427077411
- Soroosh Armandi, D.O.Montebello, CA 906401427137439
- Mohammad Chaudhry, M.DMontebello, CA 906401760423669
- Angelina Espinoza-Lopez, MDMontebello, CA 906401144315565
- Jackson Ma, M.D.Montebello, CA 906401447298732
- Mohinderjit Neelam, M.D.Montebello, CA 906401457325193
- Muzzamil Parekh, M.D.Montebello, CA 906401235188368
- Jagdishchandr Parikh, M.D.Montebello, CA 906401760422067
Common questions
What is Jonathan S. Chien, M.D.'s NPI number?
Jonathan S. Chien, M.D.'s National Provider Identifier (NPI) is 1558327270, issued on Apr 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan S. Chien, M.D. located?
The NPPES record lists a practice address at 2603 Via Campo, Montebello, CA, 90640. Phone: (323) 720-1144. Providers update this record themselves, so call before visiting.
How can I verify Jonathan S. Chien, M.D.'s license?
NPPES lists California license number A50095, 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 Jonathan S. Chien, M.D. prescribe under Medicare Part D?
In 2024, Jonathan S. Chien, M.D. had 6,864 Medicare Part D claims for 515 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.