Chau L Chen, MD
Internal Medicine Physician · St Louis, MO
Chau L Chen, MD is an internal medicine physician with a practice address in St Louis, Missouri, and NPI 1760570071, issued on Oct 11, 2006. Check the license (Missouri 35577, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Chau L Chen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 35577 MO
C51929 CA
53838 IL
Self-reported in NPPES; status is on the state search - Practice location
- 8401 Olive Blvd, St Louis, MO 63132
- Phone
- (314) 997-3430
- Enumerated
- Oct 11, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (618) 345-1113
- Medicare enrollment
- Enrolled (PECOS I20101108001220); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,604 in Missouri → Look up another NPI →
Verify Chau L Chen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 35577Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average internal medicine physician in 2024
402 Medicare Part D claims for 43 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Atorvastatin Calcium43 claims
- Amlodipine Besylate40 claims
- Metformin Hcl37 claims
- Glipizide Er29 claims
- Azithromycin17 claims
- Losartan Potassium17 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.
Chau L Chen among 2,604 internal medicine physician records in Missouri
Chau L Chen, MD is one of 2,604 internal medicine physician records with a practice address in Missouri. 77% 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 8% of them.
- NPI issued2006 · 8% of these records are older, 59% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 55% of these records are
- Graduated1966 · median 2006 among the 1,443 with a school on file
- Record last updated2007 · 48% 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 Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
58 internal medicine physician records list a practice address in St Louis
They are 58 of the 1,420 NPPES records with a practice address in St Louis, and 2,604 internal medicine physician records in Missouri.
All 2,604 in Missouri → Every provider in St Louis → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Walter Griffin, M.D.Saint Louis, MO 631321861675688
- Naveenkumar Krishna, M.DSaint Louis, MO 631321417180704
- Treena Sturgeon, D.O.Saint Louis, MO 631321588891576
- Maria Acosta-Villarreal, M.D.Saint Louis, MO 631311578936910
- Ayaz Ahmad, MDSaint Louis, MO 631311629573142
- Rachel Duncan, MDSaint Louis, MO 631311639601628
- Matthew Gerling, DOSaint Louis, MO 631311407387376
- Madeline Hannibal, MDSaint Louis, MO 631311770150955
Common questions
What is Chau L Chen, MD's NPI number?
Chau L Chen, MD's National Provider Identifier (NPI) is 1760570071, issued on Oct 11, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Chau L Chen, MD located?
The NPPES record lists a practice address at 8401 Olive Blvd, St Louis, MO, 63132. Phone: (314) 997-3430. Providers update this record themselves, so call before visiting.
How can I verify Chau L Chen, MD's license?
NPPES lists Missouri license number 35577, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Chau L Chen, MD prescribe under Medicare Part D?
In 2024, Chau L Chen, MD had 402 Medicare Part D claims for 43 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.