Dr. Chad R. Johnston, MD
Dr. Chad R. Johnston, MD is an Internal Medicine in Du Quoin, Illinois. Graduated from Southern Illinois University School of Medicine in 2003, 23 years ago. Practices with Marshall Browning Hospital Association, a 30-clinician group and accepts Medicare assignment. Licensed in California, Colorado and Illinois.
- Years since qualifying
- 23
- Trained at
- Southern Illinois University School of Medicine
- Licensed in
- CA, CO, IL
- In the registry since
- 2006
- Specialties on file
- 3
What do these letters mean?
- MD — Doctor of Medicine
- A physician who completed allopathic medical school.
Practice location Address checks out
916 N Washington StDu Quoin, IL 62832-1200
Phone: (618) 542-2146
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Pin is approximate — placed at the ZIP-code centre, not the exact door.
Specialties & licences
| Internal Medicine Physician (primary) | Taxonomy 207R00000X · Licence 036119004 (IL) |
|---|---|
| Addiction Medicine (Internal Medicine) Physician | Taxonomy 207RA0401X · Licence 0058849 (CO) |
| Internal Medicine Physician | Taxonomy 207R00000X · Licence A95435 (CA) |
Record details
| NPI number | 1538239520 |
|---|---|
| Entity type | Individual (Type 1) |
| Gender | Male |
| Credentials | MD |
| Sole proprietor | No |
| NPI enumerated | November 8, 2006 |
| Last updated in NPPES | December 2, 2025 |
| Certification date | December 2, 2025 |
Medicare enrollment
| Medicare specialty | INTERNAL MEDICINE |
|---|---|
| Medical school | SOUTHERN ILLINOIS UNIVERSITY SCHOOL OF MEDICINE |
| Graduated | 2003 (23 years in practice) |
| Group practice | Marshall Browning Hospital Association — 30 clinicians |
| Accepts Medicare assignment | Yes — accepts the Medicare-approved amount |
| Practice locations | 3 on file with Medicare |