Margaret Chang, M.D.
NPI 1477504405 · Retina Specialist (Ophthalmology) Physician · Sacramento, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Margaret Chang, M.D. is a Retina Specialist (Ophthalmology) Physician provider in Sacramento, CA (NPI 1477504405).
Provider details
- NPI number
- 1477504405
- Entity type
- Individual
- Primary specialty
- Retina Specialist (Ophthalmology) PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- D64111 (MD)
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
8,560 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 | 3,595 | $45 |
| Injection of Drug Into Eye67028 | 2,166 | $138 |
| Established Patient Complete Exam of Visual System92014 | 1,136 | $141 |
| Established Patient Problem Focused Exam of Visual System92012 | 685 | $100 |
| Exam of Retinal Blood Vessels Using a Special Camera After Injection of a Dye92235 | 334 | $185 |
| New Patient Complete Exam of Visual System92004 | 169 | $165 |
| Photography of the Retina |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ketorolac Tromethamine | 201 | 65 |
| Prednisolone Acetate | 122 | 102 |
| Ofloxacin | 95 | 84 |
| Latanoprost | 50 | 24 |
| Brimonidine Tartrate | 20 | 11 |
| Dorzolamide Hcl | 14 | — |
| Brimonidine Tartrate/Timololbrand: Brimonidine Tartrate-Timolol | 13 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they include cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$68,720 across 72 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
- 2006-05-15
- Last updated
- 2017-04-02
Frequently asked questions
- What is Margaret Chang's NPI number?
- Margaret Chang's National Provider Identifier (NPI) is 1477504405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Margaret Chang's specialty?
- Margaret Chang is listed in the NPPES registry with a primary specialty of Retina Specialist (Ophthalmology) Physician (Allopathic & Osteopathic Physicians).
- Where is Margaret Chang located?
- Margaret Chang's practice location on file with NPPES is 3939 J St, Sacramento, CA 95819-3631.
- What is Margaret Chang's phone number?
- The practice phone number listed in the NPPES registry for Margaret Chang is (916) 454-4861.
- Does Margaret Chang accept Medicare?
- Margaret Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Margaret Chang's NPI active?
- Yes — Margaret Chang's NPI (1477504405) is active in the NPPES registry as of the last update on 2017-04-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.