Doctor profile · Federal record
Dr. Warren Chang, M.D.
Ophthalmology Physician (CMS: Ophthalmology) · Bloomington, IN
- NPI 1902888662
- Accepts Medicare
- MIPS 95.1 / 100 · 2023
- 34 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
1011 W 2Nd St
Bloomington, IN 474032216
(812) 334-1213
fax (812) 333-5039
Credentials & registration
- NPI registered
- November 2005 — 21 yrs on file
- Profile last updated
- February 14, 2012
- Year of graduation
- 1992 — 34 yrs since
- Specialty taxonomy
- 207W00000X — NUCC code
- State license (1)
- Indiana #IN01052241
- Medicaid
- IN #200257620A
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1902888662. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
13,461
Distinct HCPCS
10
Medicare allowed
$1,957,227
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
J0585 |
Injection, onabotulinumtoxina, 1 unit | 7,400 | 23 | $6 | |
J0178 |
Injection, aflibercept, 1 mg | 1,414 | 124 | $868 | |
92136 |
Measurement of corneal curvature and depth of eye | 756 | 409 | $37 | |
66984 |
Removal of cataract with insertion of prosthetic lens | 728 | 400 | $451 | |
67028 |
Injection of drug into eye | 711 | 134 | $109 | |
92134 |
Imaging of retina | 524 | 199 | $38 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 523 | 385 | $85 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 348 | 277 | $120 | |
66821 |
Removal of recurring cataract in lens capsule using a laser | 214 | 148 | $267 | |
92081 |
Exam of visual field with limited testing | 157 | 124 | $30 |
In context: peer comparison
Among 3 peers in Bloomington Ophthalmology Physician, average services per provider: 432. This provider delivers 31× the peer median.Open Payments
Industry payments received
All-time total
$777
Transactions
27
Manufacturers
11
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Regeneron Healthcare Solutions, INC. | 8 | $210.72 | |
| Alcon Vision LLC | 6 | $157.28 | |
| Regeneron Pharmaceuticals, INC. | 1 | $108.47 | |
| Genentech USA, INC. | 4 | $98.94 | |
| Glaukos Corporation | 2 | $46.74 | |
| RxSight INC | 1 | $43.74 | |
| Astellas Pharma Global Development | 1 | $34.48 | |
| Johnson & Johnson Surgical Vision, INC. | 1 | $24.27 | |
| Amgen INC. | 1 | $21.33 | |
| Harrow Eye, LLC | 1 | $18.91 | |
| New World Medical,INC. | 1 | $12.60 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
1,007
Patients
526
Total drug cost
$115,943
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Erythromycin (Erythromycin Base) | Brand | 233 | 182 | $2,560 |
| Latanoprost | Generic | 202 | 60 | $4,647 |
| Timolol Maleate | Generic | 113 | 34 | $5,552 |
| Tobramycin-Dexamethasone (Tobramycin/Dexamethasone) | Brand | 84 | 67 | $6,756 |
| Lumigan (Bimatoprost) | Brand | 59 | 22 | $32,604 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 49 | 48 | $261 |
| Brimonidine Tartrate | Generic | 48 | 16 | $4,586 |
| Prolensa (Bromfenac Sodium) | Brand | 39 | 16 | $15,442 |
| Ofloxacin | Generic | 32 | 23 | $507 |
| Prednisolone Acetate | Generic | 32 | 22 | $1,650 |
Frequently asked questions
What is Dr. Warren Chang's medical specialty?
Dr. Warren Chang practices Ophthalmology Physician in Bloomington, IN.
Where does Dr. Warren Chang practice?
Dr. Warren Chang practices at 1011 W 2Nd St, Bloomington, IN 474032216. Office phone: 8123341213.
What is Dr. Warren Chang's NPI?
Dr. Warren Chang's National Provider Identifier (NPI) is 1902888662, 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: Injection, onabotulinumtoxina, 1 unit (HCPCS J0585); Injection, aflibercept, 1 mg (HCPCS J0178); Measurement of corneal curvature and depth of eye (HCPCS 92136). Source: CMS Medicare Physician & Other Practitioners file.