Joanna Chieh Jen, MD
Neurology Physician · Los Angeles, CA
Joanna Chieh Jen, MD is a neurology physician with a practice address in Los Angeles, California, and NPI 1407879216, issued on Jul 25, 2006. Check the license (California G78644, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joanna Chieh Jen
- Credential
- MD
- Primary taxonomy
- Neurology Physician 2084N0400X
- License number
- G78644 CA
Self-reported in NPPES; status is on the state search - Practice location
- 300 Medical Plaza, Los Angeles, CA 90095
- Phone
- (310) 794-1195
- Enumerated
- Jul 25, 2006
- Record last updated
- Oct 21, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid ID
- 00G786440 CA
- Medicare enrollment
- Enrolled (PECOS I20171207001003); accepts Medicare assignment
- Medical or professional school
- Yale University School Of Medicine, 1992
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest neurology physician records → All 2,339 in California → Look up another NPI →
Also registered at 300 Medical Plaza
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Joanna Chieh Jen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G78644Check 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 neurology physician in 2024
54 Medicare Part D claims for 22 beneficiaries, against an average of 1,370 among the 15,005 providers of this specialty who prescribed in Part D.
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: $39.33
1 payment: food and beverage; the largest payer was Ucb, Inc. The 10,858 providers of this specialty with any payment received $8,318.07 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
- Icahn School OF Medicine AT Mount SinaiNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joanna Chieh Jen among 2,339 neurology physician records in California
Joanna Chieh Jen, MD is one of 2,339 neurology 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 2006, is newer than 4% of them.
- NPI issued2006 · 4% of these records are older, 59% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated1992 · median 2006 among the 1,628 with a school on file
- Record last updated2010 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084N0400X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Neurology Physician providers in California
There are 2,339 neurology physician records in California.
All 2,339 in California → Every provider in Los Angeles → Neurology Physician nationwide →
The 8 neurology physician records with the nearest ZIP codes
- David Alexander, M.D.Los Angeles, CA 900951154371334
- Robert Baloh, MDLos Angeles, CA 900951801811252
- Ronnie Bergen, MDLos Angeles, CA 900951750353488
- Timothy Cloughesy, MDLos Angeles, CA 900951154356053
- Robert Collins, MDLos Angeles, CA 900951871518233
- Jeffrey Cummings, MDLos Angeles, CA 900951457376329
- Dawn Eliashiv, M.D.Los Angeles, CA 900951144286162
- Neeta Garg, MDLos Angeles, CA 900951649242728
Common questions
What is Joanna Chieh Jen, MD's NPI number?
Joanna Chieh Jen, MD's National Provider Identifier (NPI) is 1407879216, issued on Jul 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joanna Chieh Jen, MD located?
The NPPES record lists a practice address at 300 Medical Plaza, Los Angeles, CA, 90095. Phone: (310) 794-1195. Providers update this record themselves, so call before visiting.
How can I verify Joanna Chieh Jen, MD's license?
NPPES lists California license number G78644, 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 Joanna Chieh Jen, MD prescribe under Medicare Part D?
In 2024, Joanna Chieh Jen, MD had 54 Medicare Part D claims for 22 beneficiaries; the average among neurology physician prescribers was 1,370. 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.