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Edit this profileAt a glance
- 100 E California Blvd, Pasadena, CA 91105
About Dr. Chang
Listed in the NPI registry as an ophthalmology — retina specialist, Tom S. Chang, MD practices in Pasadena, CA. Tom is also listed as specializing in ophthalmology. Medicare claims data shows Tom provided 15,047 services to 2,275 patients. The services billed most often include injection, ranibizumab-eqrn (cimerli), biosimilar, 0.1 mg, injection, pegcetacoplan, intravitreal, 1 mg, and imaging of retina. NPI 1609848969 identifies this record in the national registry.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
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
- (626) 568-8838
- Email not available
Practice Locations
100 E CALIFORNIA BLVD
Pasadena, CA 91105
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
Eye injury and cancer
Inflammation, neurologic, and orbit
Most searched conditions
Cornea and external eye
Eyelid and tear drainage
Refractive and focusing
- Astigmatism
- Eye misalignment (strabismus)
- Farsightedness
- Lazy eye (amblyopia)
- Nearsightedness
- Presbyopia
Retina and vitreous
Eye injuries
Retina & vitreous
Procedures & services
Cataract and lens
- Cataract surgery with lens implant
- Laser-assisted cataract surgery
- Intraocular lens exchange
- YAG laser capsulotomy
Cornea and refractive
Emergency and minor
- Corneal rust-ring removal
- Removal of an eye foreign body
- Repair of an eye or eyelid laceration
- Repair of ruptured globe
Examination and imaging
- Eye ultrasound
- Slit-lamp examination
- Visual-field testing
- Corneal topography
- Fluorescein angiography
Eyelid, tear duct, and muscle
- Chalazion removal
- Ectropion repair
- Eyelid surgery
- Tear-duct probing
- Drooping-eyelid repair
- Entropion repair
- Eye-muscle surgery
- Tear-duct bypass surgery
Glaucoma
- Cyclophotocoagulation
- Trabeculectomy
- Glaucoma drainage-device implantation
- Laser peripheral iridotomy
- Minimally invasive glaucoma surgery
- Selective laser trabeculoplasty
Retina
Most searched procedures
Corneal procedures
Eye diagnostics
Eye injuries
Eyelid surgery
Laser eye surgery
Laser procedures
Laser vision correction
Refractive surgery
Tear duct & Orbit
Procedures Most Often Billed to Medicare
15,047 services · 2,275 patients · 22 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Injection of drug into eye | Procedure | 67028 |
1,733 | More often than most peers in Ophthalmology — Retina Specialist |
| Destruction of leaking blood vessels of retina using laser | Procedure | 67228 |
80 | More than most peers in Ophthalmology — Retina Specialist |
| Closure of tear duct opening using plug | Procedure | 68761 |
30 | Less often than most peers in Ophthalmology — Retina Specialist |
| Imaging of retina | Treatment | 92134 |
2,341 | More often than most peers in Ophthalmology — Retina Specialist |
| Established patient complete exam of visual system | Treatment | 92014 |
430 | As often as other peers in Ophthalmology — Retina Specialist |
| Established patient problem focused exam of visual system | Treatment | 92012 |
374 | More often than most peers in Ophthalmology — Retina Specialist |
| Photography of the retina | Treatment | 92250 |
222 | More often than most peers in Ophthalmology — Retina Specialist |
| Exam of retinal blood vessels using a special camera after injection of a dye | Treatment | 92235 |
222 | More often than most peers in Ophthalmology — Retina Specialist |
| Exam of retinal blood vessels and blood vessels between the white part of eye and retina using a special camera after injection of a dye | Treatment | 92242 |
58 | As often as other peers in Ophthalmology — Retina Specialist |
| New patient complete exam of visual system | Treatment | 92004 |
50 | As often as other peers in Ophthalmology — Retina Specialist |
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 2
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 8
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 28 related providers in 4 groups
Other eye doctors in Pasadena 4
Same specialty, same city.
Trained at Other 8
Other providers in the same specialty who trained at the same institution.
Class of 1988 at Other 8
Providers who graduated from the same medical school in the same year.
Also performs Injection of drug into eye 8
Providers in CA who bill this service to Medicare most often.
Common questions
What is Dr. Chang's specialty?
Dr. Chang is an eye doctor in Pasadena, CA. That is the designation recorded for this NPI in the federal registry, where it is listed as “Ophthalmology — Retina Specialist”.
NPI registry
Where can I find Dr. Chang?
Dr. Chang is listed at 100 E California Blvd, Pasadena, CA 91105. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Dr. Chang?
The number on file is (626) 568-8838. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Chang?
Dr. Chang's National Provider Identifier is 1609848969. 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
What is Dr. Chang's medical education?
Dr. Chang attended Other, graduating in 1988. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Chang have?
Dr. Chang has 38 years experience. Calculated from a graduation year of 1988, reported in the CMS National Downloadable File.
CMS public data
What is Dr. Chang known for?
According to Medicare billing data, Dr. Chang performs procedures including injection of drug into eye, destruction of leaking blood vessels of retina using laser and closure of tear duct opening using plug; provides treatments such as imaging of retina and established patient complete exam of visual system, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Chang's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Chang. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.