Joan Weichun Chen, MD
Gastroenterology Physician · Ann Arbor, MI
Joan Weichun Chen, MD is a gastroenterology physician with a practice address in Ann Arbor, Michigan, and NPI 1932371713, issued on Apr 1, 2008. Check the license (Michigan 4301103392, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Joan Weichun Chen
- Credential
- MD
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 4301103392 MI
036119706 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1500 East Medical Center Dr, Ann Arbor, MI 48109
- Phone
- (734) 647-5944
- Enumerated
- Apr 1, 2008
- Record last updated
- Sep 3, 2013 (not updated in 13 years: call before relying on the address or phone)
- Fax
- (734) 936-5458
- Medicaid ID
- 036119706 IL
- Medicare enrollment
- Enrolled (PECOS I20131029001628); accepts Medicare assignment
- Medical or professional school
- Vanderbilt University School Of Medicine, 2005
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 550 in Michigan → Look up another NPI →
Also registered at 1500 East Medical Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Samia Abdelnabi, CNMAdvanced Practice Midwife1639404320
- Mahshid Abir, MDEmergency Medicine Physician1790988632
- Barbara Adams, MDPediatric Rheumatology Physician1962412577
- David Adams, MBBSAnesthesiology Physician1346484417
- Gaury Adhikary, MDAnesthesiology Physician1629094297
- Jeremy Adler, MDPediatric Gastroenterology Physician1033243191
Verify Joan Weichun Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301103392Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
73% fewer Medicare Part D claims than the average gastroenterology physician in 2024
216 Medicare Part D claims for 83 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims.
Most prescribed
- Omeprazole85 claims
- Peg 3350-Electrolyte31 claims
- Esomeprazole Magnesium17 claims
- Pantoprazole Sodium17 claims
- Famotidine11 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: $11,482.01
16 payments; by number, the most common kind was food and beverage; the largest payer was Phathom Pharmaceuticals, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 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
- Regents OF The University OF MichiganAnn Arbor, MI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joan Weichun Chen among 550 gastroenterology physician records in Michigan
Joan Weichun Chen, MD is one of 550 gastroenterology physician records with a practice address in Michigan. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 62% of them.
- NPI issued2008 · 62% of these records are older, 34% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 75% of these records are
- Graduated2005 · median 2003 among the 415 with a school on file
- Record last updated2013 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in Michigan
There are 550 gastroenterology physician records in Michigan.
All 550 in Michigan → Every provider in Ann Arbor → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- John Allen, MDAnn Arbor, MI 481091154393502
- Frederick Askari, MD, PHDAnn Arbor, MI 481091689756108
- Hari Conjeevaram, MDAnn Arbor, MI 481091831271360
- Grace Elta, MDAnn Arbor, MI 481091275615700
- Joseph Kolars, M.D.Ann Arbor, MI 481091447222005
- Hellan Kwon, MDAnn Arbor, MI 481091336152651
- Laurence McMahon, MDAnn Arbor, MI 481091417038647
- Stacy Menees, MDAnn Arbor, MI 481091508898081
Common questions
What is Joan Weichun Chen, MD's NPI number?
Joan Weichun Chen, MD's National Provider Identifier (NPI) is 1932371713, issued on Apr 1, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Joan Weichun Chen, MD located?
The NPPES record lists a practice address at 1500 East Medical Center Dr, Ann Arbor, MI, 48109. Phone: (734) 647-5944. Providers update this record themselves, so call before visiting.
How can I verify Joan Weichun Chen, MD's license?
NPPES lists Michigan license number 4301103392, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Joan Weichun Chen, MD prescribe under Medicare Part D?
In 2024, Joan Weichun Chen, MD had 216 Medicare Part D claims for 83 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.