Doctor profile · Federal record
Dr. Warren Chang, M.D.
Internal Medicine Physician (CMS: Hospitalist) · Abingdon, VA
- NPI 1407057920
- Accepts Medicare
- 34 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
16000 Johnston Memorial Dr, Fourth Floor
Abingdon, VA 242117664
(276) 258-4050
fax (276) 258-4056 - Mailing address
-
Po Box 3700
Johnson City, TN 376023700
Credentials & registration
- NPI registered
- May 2007 — 19 yrs on file
- Profile last updated
- March 22, 2016
- Year of graduation
- 1992 — 34 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Virginia #0101241447
- Medicaid
- VA #1407057920
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1407057920. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
684
Distinct HCPCS
5
Medicare allowed
$78,070
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 347 | 110 | $114 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 133 | 65 | $75 | |
99239 |
Hospital discharge day management, more than 30 minutes | 96 | 92 | $109 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 95 | 94 | $165 | |
99291 |
Critical care, first 30-74 minutes | 13 | 13 | $203 |
In context: peer comparison
Among 9 peers in this city , average services per provider: 155. This provider delivers 4.4× the peer median.Open Payments
Industry payments received
All-time total
$30
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Inari Medical, Inc. | 1 | $29.56 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
39
Patients
25
Total drug cost
$8,322
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Eliquis (Apixaban) | Brand | 15 | 12 | $8,134 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 13 | 13 | $119 |
| Prednisone | Generic | 11 | 0 | $68 |
Hospital affiliations
Frequently asked questions
What is Dr. Warren Chang's medical specialty?
Dr. Warren Chang practices Internal Medicine Physician in Abingdon, VA.
Where does Dr. Warren Chang practice?
Dr. Warren Chang practices at 16000 Johnston Memorial Dr, Abingdon, VA 242117664. Office phone: 2762584050.
What is Dr. Warren Chang's NPI?
Dr. Warren Chang's National Provider Identifier (NPI) is 1407057920, issued by NPPES.
Does Dr. Warren Chang accept Medicare assignment?
Yes. Dr. Warren Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Warren Chang commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Hospital discharge day management (HCPCS 99239). Source: CMS Medicare Physician & Other Practitioners file.