Tom Chang, MD
NPI 1609848969 · Retina Specialist (Ophthalmology) Physician · Pasadena, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Tom Chang, MD is a Retina Specialist (Ophthalmology) Physician provider in Pasadena, CA (NPI 1609848969).
Provider details
- NPI number
- 1609848969
- Entity type
- Individual
- Primary specialty
- Retina Specialist (Ophthalmology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- A69909 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
5,773 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Imaging of Retina92134 | 2,341 | $44 |
| Injection of Drug Into Eye67028 | 1,733 | $120 |
| Established Patient Complete Exam of Visual System92014 | 430 | $136 |
| Established Patient Problem Focused Exam of Visual System92012 | 374 | $98 |
| Exam of Retinal Blood Vessels Using a Special Camera After Injection of a Dye92235 | 222 | $182 |
| Photography of the Retina92250 | 222 | $36 |
| Compounded Drug, Not Otherwise Classified |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 463 | 200 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 145 | 72 |
| Prednisolone Acetate | 90 | 55 |
| Timolol Maleate | 66 | 33 |
| Brimonidine Tartrate | 52 | 25 |
| Ofloxacin | 51 | 34 |
| Ketorolac Tromethamine | 40 | 24 |
| Cyclosporine | 37 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$258 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-02-02
- Last updated
- 2020-08-07
- Certified
- 2020-08-07
Frequently asked questions
- What is Tom Chang's NPI number?
- Tom Chang's National Provider Identifier (NPI) is 1609848969, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Tom Chang's specialty?
- Tom Chang is listed in the NPPES registry with a primary specialty of Retina Specialist (Ophthalmology) Physician (Allopathic & Osteopathic Physicians).
- Where is Tom Chang located?
- Tom Chang's practice location on file with NPPES is 100 E California Blvd, Pasadena, CA 91105-3205.
- What is Tom Chang's phone number?
- The practice phone number listed in the NPPES registry for Tom Chang is (626) 568-8838.
- Does Tom Chang accept Medicare?
- Tom Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Tom Chang's NPI active?
- Yes — Tom Chang's NPI (1609848969) is active in the NPPES registry as of the last update on 2020-08-07.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.