Doctor profile · Federal record
Dr. Chad Johnston, MD
Internal Medicine Physician (CMS: Internal Medicine) · Addiction Medicine (Internal Medicine) Physician · Internal Medicine Physician · Du Quoin, IL
- NPI 1538239520
- Accepts Medicare
- 23 yrs in practice
- Licensed in 3 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
916 N Washington St
Du Quoin, IL 628321200
(618) 542-2146 - Mailing address
-
900 N Washington St
Du Quoin, IL 628321233
Credentials & registration
- NPI registered
- November 2006 — 20 yrs on file
- Profile last updated
- December 2, 2025
- Year of graduation
- 2003 — 23 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State licenses (3)
- Illinois #036119004 · Colorado #0058849 · California #A95435
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1538239520. Last verified May 11, 2026.Open Payments
Industry payments received
All-time total
$168
Transactions
10
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Janssen Biotech, INC. | 9 | $145.18 | |
| Uswm, LLC | 1 | $23.05 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
87
Patients
0
Total drug cost
$18,095
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Buprenorphine-Naloxone (Buprenorphine Hcl/Naloxone Hcl) | Brand | 50 | 0 | $8,048 |
| Suboxone (Buprenorphine Hcl/Naloxone Hcl) | Brand | 15 | 0 | $9,685 |
| Alprazolam | Generic | 11 | 0 | $16 |
| Buprenorphine Hcl | Generic | 11 | 0 | $346 |
Frequently asked questions
What is Dr. Chad Johnston's medical specialty?
Dr. Chad Johnston practices Internal Medicine Physician in Du Quoin, IL.
Where does Dr. Chad Johnston practice?
Dr. Chad Johnston practices at 916 N Washington St, Du Quoin, IL 628321200. Office phone: 6185422146.
What is Dr. Chad Johnston's NPI?
Dr. Chad Johnston's National Provider Identifier (NPI) is 1538239520, issued by NPPES.
Does Dr. Chad Johnston accept Medicare assignment?
Yes. Dr. Chad Johnston accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.