Douglas Chang, M.D.
Internal Medicine Physician · Elgin, IL
Douglas Chang, M.D. is an internal medicine physician with a practice address in Elgin, Illinois, and NPI 1447393616, issued on Feb 15, 2007. Check the license on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Douglas Chang
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- Practice location
- 750 S State St, Elgin, IL 60123
- Phone
- (847) 742-1040
- Enumerated
- Feb 15, 2007
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
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Verify Douglas Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional RegulationCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
100% fewer Medicare Part D claims than the average internal medicine physician in 2024
12 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of 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.
Douglas Chang among 7,238 internal medicine physician records in Illinois
Douglas Chang, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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 39% of them.
- NPI issued2007 · 39% of these records are older, 55% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2007 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
62 internal medicine physician records list a practice address in Elgin
They are 62 of the 2,268 NPPES records with a practice address in Elgin, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Elgin → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Richard Baley, M.D.Elgin, IL 601231184693327
- Jawed Ehsan, MDElgin, IL 601231114901501
- John Fiedler, M.D.Elgin, IL 601231487623716
- Dennis Flynn, M.D.Elgin, IL 601231295704435
- Jeffrey Garb, M.D.Elgin, IL 601231023063237
- Anandita Gephart, M.D.Elgin, IL 601231790709343
- Michael Hernandez, M.D.Elgin, IL 601231972501096
- Ronald Hirsch, M.D.Elgin, IL 601231467450585
Common questions
What is Douglas Chang, M.D.'s NPI number?
Douglas Chang, M.D.'s National Provider Identifier (NPI) is 1447393616, issued on Feb 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Douglas Chang, M.D. located?
The NPPES record lists a practice address at 750 S State St, Elgin, IL, 60123. Phone: (847) 742-1040. Providers update this record themselves, so call before visiting.
How can I verify Douglas Chang, M.D.'s license?
Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Douglas Chang, M.D. prescribe under Medicare Part D?
In 2024, Douglas Chang, M.D. had 12 Medicare Part D claims; 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.