Dr. Emmanuel Chang, MD/PHD
What this data tells you about Dr. Chang
Dr. Emmanuel Chang is a retina specialist physician in Bellaire, TX, with 17 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 50,533 Medicare services across 3,058 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $255,870 from 23 pharmaceutical and/or device companies across 393 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in retina specialist (ophthalmology) physician. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chang is Very High — reflecting how much public federal data is available about this provider. This is not a quality rating. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Eye injection (Vabysmo/faricimab) An injection of faricimab-svoa, a medication administered in 0.1 mg doses. |
43,560 | $29 | $93 |
| Retinal imaging (OCT scan) This procedure involves imaging the retina to visualize its structure. It is used to examine the back of the eye. |
1,650 | $30 | $100 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
1,230 | $85 | $318 |
| Extended exam of back of eye with optic nerve drawing A detailed examination of the posterior section of the eye, including the optic nerve, with documentation through drawing. |
924 | $12 | $39 |
| Eye injection for retinal disease A procedure involving the administration of medication directly into the eye. |
893 | $99 | $333 |
| Aflibercept eye injection (Eylea) | 758 | $685 | $987 |
| Extended eye exam with retinal drawing A detailed examination of the back of the eye that includes creating a drawing of the retina. |
395 | $19 | $62 |
| Comprehensive eye exam, established patient A comprehensive examination of the visual system performed for a patient who has previously been seen by the provider. |
257 | $98 | $312 |
| Injection, ranibizumab, 0.1 mg | 240 | $188 | $413 |
| Ultrasound of eye tissue and structures A diagnostic imaging test that uses sound waves to create pictures of the eye's internal tissues and structures. |
210 | $36 | $112 |
| Retinal angiography with dye injection This procedure uses a special camera to examine the blood vessels in the retina after a dye has been injected into the body. |
142 | $97 | $336 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
89 | $115 | $418 |
| Retinal photography (fundus photo) This procedure involves taking photographs of the retina, the light-sensitive tissue at the back of the eye. It is used to document the condition of the eye's interior structures. |
54 | $28 | $93 |
| Bevacizumab injection, 10 mg Administration of a 10 mg dose of bevacizumab medication via injection. |
54 | $56 | $85 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
30 | $124 | $456 |
| Complex detached retina repair with eye fluid drainage A surgical procedure to repair a detached retina and drain fluid located between the lens and the retina. |
17 | $1,047 | $3,381 |
| New patient office visit, complex (60-74 min) | 17 | $151 | $554 |
| Fluorescein angiography of retina A special camera captures images of the blood vessels in the retina and the area between the white part of the eye and the retina after a dye is injected. |
13 | $195 | $666 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
Associated products mentioned in payments ›
The majority of payments (70%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in retina specialist (ophthalmology) physician and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 6% for retina specialist (ophthalmology) physician in TX.
Geographic Context
1.2 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Chang is a mixed practice specialist, with above-average Medicare volume (top 3% in TX), with speaking/promotional industry engagement in the top 6% of TX peers, with 17 years of NPI registration.
This summary is auto-generated from federal data. It describes data availability and patterns — not clinical quality. Read our methodology →
Frequently Asked Questions
Is Dr. Chang experienced with eye injection (vabysmo/faricimab)?
Does Dr. Chang receive payments from pharmaceutical companies?
How do Dr. Chang's costs compare to other retina specialist physicians in Bellaire?
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. The Transparency Score measures data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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