David Chang, M.D.
NPI 1316966138 · Ophthalmology Physician · Los Altos, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
David Chang, M.D. is a Ophthalmology Physician provider in Los Altos, CA (NPI 1316966138).
Provider details
- NPI number
- 1316966138
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- G045581 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
3,315 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) |
|---|---|---|
| Measurement of Corneal Curvature and Depth of Eye92136 | 1,192 | $48 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 940 | $636 |
| New Patient Complete Exam of Visual System92004 | 588 | $178 |
| Established Patient Complete Exam of Visual System92014 | 138 | $152 |
| Imaging of Retina92134 | 106 | $45 |
| Complex Removal of Cataract With Insertion of Prosthetic Lens66982 | 103 | $861 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 9 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Diclofenac Sodium | 173 | 109 |
| Prednisolone Acetate | 128 | 78 |
| Polymyxin B Sulf/Trimethoprimbrand: Polymyxin B Sul-Trimethoprim | 54 | 47 |
| Loteprednol Etabonate | 38 | 23 |
| Timolol Maleate | 25 | 14 |
| Parenteral Amino Acid 20% No.1brand: Prosol | 23 | — |
| Ketorolac Tromethamine | 21 | 16 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$11,617 across 19 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
- 2006-07-19
- Last updated
- 2015-05-05
Frequently asked questions
- What is David Chang's NPI number?
- David Chang's National Provider Identifier (NPI) is 1316966138, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is David Chang's specialty?
- David Chang is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is David Chang located?
- David Chang's practice location on file with NPPES is 762 Altos Oaks Dr, Los Altos, CA 94024-5434.
- What is David Chang's phone number?
- The practice phone number listed in the NPPES registry for David Chang is (650) 948-9123.
- Does David Chang accept Medicare?
- David Chang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is David Chang's NPI active?
- Yes — David Chang's NPI (1316966138) is active in the NPPES registry as of the last update on 2015-05-05.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.