Jonathan David Grein, MD
Internal Medicine Physician · Los Angeles, CA
Jonathan David Grein, MD is an internal medicine physician with a practice address in Los Angeles, California, and NPI 1295956092, issued on May 1, 2007. Check the license (California A94549, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jonathan David Grein
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A94549 CA
Self-reported in NPPES; status is on the state search - Practice location
- 8635 W 3RD St, Los Angeles, CA 90048
- Phone
- (310) 423-5574
- Enumerated
- May 1, 2007
- Record last updated
- Mar 23, 2010 (not updated in 16 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 8635 W 3RD St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Jonathan David Grein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A94549Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 87.7 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).
Jonathan David Grein among 17,696 internal medicine physician records in California
Jonathan David Grein, 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 2007, is newer than 44% of them.
- NPI issued2007 · 44% of these records are older, 44% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- Record last updated2010 · 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).
1,423 internal medicine physician records list a practice address in Los Angeles
They are 1,423 of the 69,537 NPPES records with a practice address in Los Angeles, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Los Angeles → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- George Chaux, M.D.Los Angeles, CA 900481619938941
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- Amanda Ewing, M.D.West Hollywood, CA 900481982661922
- Farshid Fararooy, M.D.Los Angeles, CA 900481922045939
- Eleonora Fedonenko, M.D.Los Angeles, CA 900481790721850
- Christina Harris, MDLos Angeles, CA 900481073553962
- Homayoon Khanlou, MDLos Angeles, CA 900481356335277
- Dorothy Lowe, M.D.Los Angeles, CA 900481275577835
Common questions
What is Jonathan David Grein, MD's NPI number?
Jonathan David Grein, MD's National Provider Identifier (NPI) is 1295956092, issued on May 1, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan David Grein, MD located?
The NPPES record lists a practice address at 8635 W 3RD St, Los Angeles, CA, 90048. Phone: (310) 423-5574. Providers update this record themselves, so call before visiting.
How can I verify Jonathan David Grein, MD's license?
NPPES lists California license number A94549, 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.
What is Jonathan David Grein, MD's MIPS final score?
The 2023 MIPS final score is 87.7 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.