William Sun, M.D.
NPI 1043247943 · Ophthalmology Physician · Philadelphia, PA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Sun, M.D. is a Ophthalmology Physician provider in Philadelphia, PA (NPI 1043247943).
Provider details
- NPI number
- 1043247943
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MD-020214-E (PA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
1,650 Medicare services, 2024 (ranked within specialty)
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 methodology.
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 Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 387 | $131 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 311 | $93 |
| Established Patient Complete Exam of Visual System92014 | 297 | $129 |
| Exam of Visual Field With Extended Testing92083 | 291 | $65 |
| Photography of the Retina92250 | 106 | $35 |
| Visit Complexity Inherent to Evaluation and Management Associated With Medical Care Services That Serve As the Continuing Focal Point for All Needed Health Care Services And/Or With Medical Care Services That Are Part of Ongoing Care Related to a Patient'S |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 13 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 673 | 133 |
| Timolol Maleate | 158 | 40 |
| Neomycin/Polymyxin B/Dexamethabrand: Neomycin-Polymyxin-Dexameth | 131 | 72 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 82 | 18 |
| Prednisolone Acetate | 60 | 29 |
| Brimonidine Tartrate | 38 | 11 |
| Azelastine Hcl | 20 | — |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-06-27
- Last updated
- 2008-03-24
Frequently asked questions
- What is William Sun's NPI number?
- William Sun's National Provider Identifier (NPI) is 1043247943, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Sun's specialty?
- William Sun is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is William Sun located?
- William Sun's practice location on file with NPPES is 2031 Locust St, Philadelphia, PA 19103-5611.
- What is William Sun's phone number?
- The practice phone number listed in the NPPES registry for William Sun is (215) 564-4277.
- Does William Sun accept Medicare?
- William Sun is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Sun's NPI active?
- Yes — William Sun's NPI (1043247943) is active in the NPPES registry as of the last update on 2008-03-24.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.