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
- Entity
- Type 1 · individual
Also registered at 750 S State St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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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 2,785 among the 127,794 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.
65 internal medicine physician records list a Elgin practice address
They are 65 of the 2,268 NPPES records with a Elgin practice address, and 8,522 internal medicine physician records in Illinois.
All 65 in Elgin → All 8,522 in Illinois → Every provider in Elgin →
Other internal medicine physician records in Illinois
- Peter Abadeer, D.O.Bloomington, IL1760469522
- Pamela Abadi, D.O.Winfield, IL1588820179
- Motaz Abas, MDPeoria, IL1215510201
- Elias Abate, M.D.Chicago, IL1336712199
- Maliha Abbas, D.O.Chicago, IL1174963920
- Zareena Abbas, MDChicago, IL1427078872
- Abu Abbasi, MDChicago, IL1083243877
- Ayesha Abbasi, MDChicago, IL1376216705
- Khalda Abbasi, MDNaperville, IL1487705240
- Misha Abbasi, MDChicago, IL1770111635
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 2,785. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.