Douglas Chang, M.D.
NPI 1447393616 · Internal Medicine Physician · Elgin, IL
Enrolled with Medicare as Order and Referring Only - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Douglas Chang, M.D. is a Internal Medicine Physician provider in Elgin, IL (NPI 1447393616).
Provider details
- NPI number
- 1447393616
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-02-15
- Last updated
- 2007-07-08
Frequently asked questions
- What is Douglas Chang's NPI number?
- Douglas Chang's National Provider Identifier (NPI) is 1447393616, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Douglas Chang's specialty?
- Douglas Chang is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Douglas Chang located?
- Douglas Chang's practice location on file with NPPES is 750 S State St, Elgin, IL 60123-7612.
- What is Douglas Chang's phone number?
- The practice phone number listed in the NPPES registry for Douglas Chang is (847) 742-1040.
- Does Douglas Chang accept Medicare?
- Douglas Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Douglas Chang's NPI active?
- Yes — Douglas Chang's NPI (1447393616) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.