Physician Profile
Warren J. Chang, M.D.
Unclaimed ProfileAbout Dr. Chang
Warren J. Chang, M.D. practices ophthalmology in Bloomington, IN. Warren is a 1992 graduate of Harvard Medical School. According to Medicare claims data, Warren cared for 2,770 Medicare patients across 14,197 services. The services billed most often include injection, onabotulinumtoxina, 1 unit, injection, aflibercept hd, 1 mg, and injection, aflibercept, 1 mg.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (812) 334-1213
- Email not available
Practice Locations
1011 W 2ND ST
Bloomington, IN 47403
Conditions Commonly Evaluated or Treated
Within Ophthalmology generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Cornea and external eye
- Blepharitis
- Corneal abrasion
- Corneal ulcer
- Keratoconus
- Pink eye
- Pterygium
Eyelid and tear drainage
- Blocked tear duct
- Chalazion
- Drooping eyelid
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
- Epiretinal membrane
- Retinal detachment
Eye injuries
Inflammation, neurologic, and orbit
- Thyroid eye disease
- Uveitis
Retina & vitreous
Procedures & services
Most searched procedures
- Cataract surgery
- Eye exam
- LASIK
- Retina surgery
Examination and imaging
- Corneal topography
- Fluorescein angiography
Cataract and lens
- Intraocular lens exchange
- YAG laser capsulotomy
Corneal procedures
- Amniotic Membrane Eye Graft
Eye diagnostics
Eye injuries
- Eye Scratch Laceration Repair
- Foreign Object Removal from Eye
Eyelid surgery
Eyelid, tear duct, and muscle
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Eyelid surgery
- Tear-duct bypass surgery
Glaucoma
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Laser eye surgery
- Laser Floater Removal
Laser procedures
- Laser Treatment for Retinal Tear
Laser vision correction
- SMILE Eye Surgery
Refractive surgery
- Clear Lens Exchange
- Implantable Contact Lenses
Tear duct & Orbit
- Orbital Decompression Surgery
- Tear Duct Plugs
Procedures Most Often Billed to Medicare
14,197 services · 2,770 patients · 25 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Injection of drug into eye | Procedure | 67028 |
707 | More often than most peers in Ophthalmology |
| Removal of cataract with insertion of prosthetic lens | Procedure | 66984 |
700 | More than most peers in Ophthalmology |
| Removal of recurring cataract in lens capsule using a laser | Procedure | 66821 |
314 | More than most peers in Ophthalmology |
| Injection of chemical for paralysis of nerve muscles on side of face | Procedure | 64612 |
68 | More often than most peers in Ophthalmology |
| Complex removal of cataract with insertion of prosthetic lens | Procedure | 66982 |
29 | More often than most peers in Ophthalmology |
| Repair of tendon of upper eyelid | Procedure | 67904 |
22 | As often as other peers in Ophthalmology |
| Laser repair to improve eye fluid flow | Procedure | 65855 |
19 | Less often than most peers in Ophthalmology |
| Removal of noncancer skin growth of face, ears, eyelids, nose, lips, or mouth, 0.5 cm or less | Procedure | 11440 |
19 | As often as other peers in Ophthalmology |
| Removal of excessive skin and fat of upper eyelid | Procedure | 15823 |
16 | Less often than most peers in Ophthalmology |
| Measurement of corneal curvature and depth of eye | Treatment | 92136 |
732 | More than most peers in Ophthalmology |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other eye doctors at this location 3
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 3
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 2
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 25 related providers in 4 groups
Trained at Harvard Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 1992 at Harvard Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Injection of drug into eye 8
Providers in IN who bill this service to Medicare most often.
Common questions
What kind of doctor is Warren J. Chang?
Warren J. Chang is an eye doctor in Bloomington, IN. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology”.
NPI registry
What is Warren J. Chang's address?
Warren J. Chang is listed at 1011 W 2Nd St, Bloomington, IN 47403. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How can I make an appointment with Warren J. Chang?
The number on file is (812) 334-1213. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Warren J. Chang's NPI number?
Warren J. Chang's National Provider Identifier is 1902888662. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Warren J. Chang train?
Warren J. Chang attended Harvard Medical School, graduating in 1992. This comes from the CMS National Downloadable File.
CMS public data
How long has Warren J. Chang been practicing?
Warren J. Chang has 34 years experience. Calculated from a graduation year of 1992, reported in the CMS National Downloadable File.
CMS public data
What procedures does Warren J. Chang perform?
According to Medicare billing data, Warren J. Chang performs procedures including injection of drug into eye, removal of cataract with insertion of prosthetic lens and removal of recurring cataract in lens capsule using a laser; provides treatments such as measurement of corneal curvature and depth of eye and imaging of retina, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Warren J. Chang confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Warren J. Chang. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.