Karen J. Chang-Chen, MD
Endocrinology, Diabetes & Metabolism Physician · Chesterfield, MO
Karen J. Chang-Chen, MD is an endocrinology, diabetes & metabolism physician with a practice address in Chesterfield, Missouri, and NPI 1508916495, issued on Jan 11, 2007. Check the license (Missouri 2006018028, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Karen J. Chang-Chen
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 2006018028 MO
Self-reported in NPPES; status is on the state search - Practice location
- 224 S Woods Mill RD Ste 480S, Chesterfield, MO 63017
- Phone
- (636) 685-7744
- Enumerated
- Jan 11, 2007
- Record last updated
- Jul 28, 2020 (not updated in 6 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20170116000208); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 206 in Missouri → Look up another NPI →
Also registered at 224 S Woods Mill RD Ste 480S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vaishaliben Ahir, MDEndocrinology, Diabetes & Metabolism Physician1376706861
- Soumya Nadella, M.D.Endocrinology, Diabetes & Metabolism Physician1316350028
Verify Karen J. Chang-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 2006018028Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
23% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
3,227 Medicare Part D claims for 386 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 55% of claims.
Most prescribed
- Levothyroxine Sodium298 claims
- Ozempic281 claims
- Metformin Hcl Er213 claims
- Mounjaro209 claims
- Rosuvastatin Calcium134 claims
- Trulicity101 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: $108,247.96
294 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 5,661 providers of this specialty with any payment received $5,742.15 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
- Endocrine Associates, LLCChesterfield, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karen J. Chang-Chen among 206 endocrinology, diabetes & metabolism physician records in Missouri
Karen J. Chang-Chen, MD is one of 206 endocrinology, diabetes & metabolism physician records with a practice address in Missouri. 88% 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 50% of them.
- NPI issued2007 · 50% of these records are older, 42% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2003 · median 2003 among the 148 with a school on file
- Record last updated2020 · 45% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Missouri
There are 206 endocrinology, diabetes & metabolism physician records in Missouri.
All 206 in Missouri → Every provider in Chesterfield → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Vaishaliben Ahir, MDChesterfield, MO 630171376706861
- Edwin Cunningham, MDChesterfield, MO 630171538267844
- Norman Fishman, M.D.Chesterfield, MO 630171528086659
- Rachel Fishman Oiknine, M.D.Chesterfield, MO 630171003840349
- Katharine Mikulec, M.D.Chesterfield, MO 630171336254887
- Soumya Nadella, M.D.Chesterfield, MO 630171316350028
- Ralph Oiknine, M.D.Chesterfield, MO 630171255365581
- Purvi Parikh, M.D.Chesterfield, MO 630171346229838
Common questions
What is Karen J. Chang-Chen, MD's NPI number?
Karen J. Chang-Chen, MD's National Provider Identifier (NPI) is 1508916495, issued on Jan 11, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen J. Chang-Chen, MD located?
The NPPES record lists a practice address at 224 S Woods Mill RD Ste 480S, Chesterfield, MO, 63017. Phone: (636) 685-7744. Providers update this record themselves, so call before visiting.
How can I verify Karen J. Chang-Chen, MD's license?
NPPES lists Missouri license number 2006018028, 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 Karen J. Chang-Chen, MD prescribe under Medicare Part D?
In 2024, Karen J. Chang-Chen, MD had 3,227 Medicare Part D claims for 386 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.