Doctor profile · Federal record
Dr. Justin Chang, MD
Family Medicine Physician (CMS: Hospitalist) · Family Medicine Physician · Waterloo, IA
- NPI 1841729910
- Accepts Medicare
- 9 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1825 Logan Ave Ste 201
Waterloo, IA 507031916
(319) 235-3838
Credentials & registration
- NPI registered
- June 2017 — 9 yrs on file
- Profile last updated
- August 10, 2020
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 207Q00000X — NUCC code
- State licenses (2)
- Iowa #47374 · Missouri #2017018876
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1841729910. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
940
Distinct HCPCS
9
Medicare allowed
$99,438
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 295 | 150 | $111 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 245 | 130 | $74 | |
99239 |
Hospital discharge day management, more than 30 minutes | 153 | 148 | $107 | |
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 105 | 102 | $161 | |
99291 |
Critical care, first 30-74 minutes | 41 | 28 | $198 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 40 | 40 | $121 | |
99238 |
Hospital discharge day management, 30 minutes or less | 22 | 22 | $75 | |
93016 |
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with supervision by physician | 20 | 20 | $20 | |
93018 |
Exercise or drug-induced heart stress test with electrocardiogram (ecg) with review by physician | 19 | 19 | $13 |
In context: peer comparison
Among 21 peers in Waterloo Family Medicine Physician, average services per provider: 97. This provider delivers 9.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
260
Patients
215
Total drug cost
$16,446
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Cefdinir | Generic | 39 | 39 | $541 |
| Furosemide | Generic | 35 | 23 | $169 |
| Jardiance (Empagliflozin) | Brand | 27 | 13 | $12,982 |
| Metoprolol Tartrate | Generic | 23 | 14 | $147 |
| Potassium Chloride | Generic | 17 | 11 | $661 |
| Prednisone | Generic | 16 | 16 | $36 |
| Clopidogrel (Clopidogrel Bisulfate) | Brand | 15 | 12 | $169 |
| Atorvastatin Calcium | Generic | 14 | 13 | $136 |
| Midodrine Hcl | Generic | 14 | 14 | $985 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 13 | 13 | $246 |
Hospital affiliations
Frequently asked questions
What is Dr. Justin Chang's medical specialty?
Dr. Justin Chang practices Family Medicine Physician in Waterloo, IA.
Where does Dr. Justin Chang practice?
Dr. Justin Chang practices at 1825 Logan Ave Ste 201, Waterloo, IA 507031916. Office phone: 3192353838.
What is Dr. Justin Chang's NPI?
Dr. Justin Chang's National Provider Identifier (NPI) is 1841729910, issued by NPPES.
Does Dr. Justin Chang accept Medicare assignment?
Yes. Dr. Justin Chang accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Justin 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.