William Ko, M.D.
NPI 1548268873 · Ophthalmology Physician · San Gabriel, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Ko, M.D. is a Ophthalmology Physician provider in San Gabriel, CA (NPI 1548268873).
Provider details
- NPI number
- 1548268873
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- G73648 (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
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
4,628 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) |
|---|---|---|
| Established Patient Problem Focused Exam of Visual System92012 | 1,285 | $99 |
| Established Patient Complete Exam of Visual System92014 | 751 | $139 |
| Imaging of Optic Nerve92133 | 531 | $38 |
| Exam of the Internal Drainage System of Eye92020 | 520 | $30 |
| Exam of Visual Field With Extended Testing92083 | 511 | $71 |
| Photography of the Retina92250 | 432 | $39 |
| Imaging of Retina92134 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 28 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 1,732 | 434 |
| Azelastine Hcl | 817 | 305 |
| Timolol Maleate | 419 | 107 |
| Bimatoprostbrand: Lumigan | 353 | 76 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 347 | 95 |
| Cyclosporinebrand: Restasis | 334 | 84 |
| Cyclosporine | 296 | 106 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$17 across 1 record (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
- 2005-07-11
- Last updated
- 2008-02-22
Frequently asked questions
- What is William Ko's NPI number?
- William Ko's National Provider Identifier (NPI) is 1548268873, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Ko's specialty?
- William Ko is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is William Ko located?
- William Ko's practice location on file with NPPES is 117 S Mission Dr, San Gabriel, CA 91776-1101.
- What is William Ko's phone number?
- The practice phone number listed in the NPPES registry for William Ko is (626) 284-2168.
- Does William Ko accept Medicare?
- William Ko is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Ko's NPI active?
- Yes — William Ko's NPI (1548268873) is active in the NPPES registry as of the last update on 2008-02-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.