Joanna W. Chen, MD
Internal Medicine Physician · Baldwin Park, CA
Joanna W. Chen, MD is an internal medicine physician with a practice address in Baldwin Park, California, and NPI 1851463335, issued on Nov 14, 2006. Check the license (California A67859, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Joanna W. Chen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- A67859 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1011 Baldwin Park Blvd, Baldwin Park, CA 91706
- Phone
- (626) 851-1011
- Enumerated
- Nov 14, 2006
- Record last updated
- Nov 22, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20090423000635); accepts Medicare assignment
- Medical or professional school
- University Of Arizona College Of Medicine, 1996
- 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 1011 Baldwin Park Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Olufemi Adenuga, M.D, MPHPulmonary Disease Physician1134389125
- Soma Agarwal, MDOphthalmology Physician1437220316
Verify Joanna W. Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A67859Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
70% more Medicare Part D claims than the average internal medicine physician in 2024
5,405 Medicare Part D claims for 732 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. 101 claims were for opioids.
Most prescribed
- Atorvastatin Calcium379 claims
- Amlodipine Besylate317 claims
- Losartan Potassium300 claims
- Levothyroxine Sodium194 claims
- Simvastatin187 claims
- Lisinopril178 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.
Industry payments in 2024: $21.98
1 payment: food and beverage; the largest payer was Organogenesis Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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
- Southern California Permanente Medical GroupBaldwin Park, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joanna W. Chen among 17,696 internal medicine physician records in California
Joanna W. Chen, 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 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
- Graduated1996 · median 2004 among the 11,065 with a school on file
- Record last updated2021 · 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).
56 internal medicine physician records list a practice address in Baldwin Park
They are 56 of the 1,055 NPPES records with a practice address in Baldwin Park, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in Baldwin Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- John Bigley, MDBaldwin Park, CA 917061447321328
- Jyh Chang, M.D.Baldwin Park, CA 917061346259595
- Victoria Chen, M.D.Baldwin Park, CA 917061760423016
- Robert Clements, MDBaldwin Park, CA 917061326119207
- Daisy Lynn Galario, M.D.Baldwin Park, CA 917061235174129
- Carolyn Hardy, MDBaldwin Park, CA 917061043381973
- Susan Hua, MDBaldwin Park, CA 917061235200213
- Sandra Koyama, MDBaldwin Park, CA 917061548331507
Common questions
What is Joanna W. Chen, MD's NPI number?
Joanna W. Chen, MD's National Provider Identifier (NPI) is 1851463335, issued on Nov 14, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Joanna W. Chen, MD located?
The NPPES record lists a practice address at 1011 Baldwin Park Blvd, Baldwin Park, CA, 91706. Phone: (626) 851-1011. Providers update this record themselves, so call before visiting.
How can I verify Joanna W. Chen, MD's license?
NPPES lists California license number A67859, 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 W. Chen, MD prescribe under Medicare Part D?
In 2024, Joanna W. Chen, MD had 5,405 Medicare Part D claims for 732 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.