William Yang, MD
NPI 1790979011 · Ophthalmology Physician · Springfield, IL
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Yang, MD is a Ophthalmology Physician provider in Springfield, IL (NPI 1790979011).
Provider details
- NPI number
- 1790979011
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 036126329 (IL)
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
18 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
788 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 Complete Exam of Visual System92014 | 205 | $123 |
| Measurement of Corneal Curvature and Depth of Eye92136 | 172 | $35 |
| Established Patient Problem Focused Exam of Visual System92012 | 151 | $88 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 113 | $539 |
| New Patient Complete Exam of Visual System92004 | 79 | $147 |
| Removal of Cataract With Insertion of Prosthetic Lens66984 | 34 | $542 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 15 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisolone Acetate | 500 | 284 |
| Ketorolac Tromethamine | 348 | 222 |
| Ofloxacin | 346 | 221 |
| Cyclosporine | 75 | 35 |
| Cyclosporinebrand: Restasis | 70 | 35 |
| Lifitegrastbrand: Xiidra | 50 | 22 |
| Valacyclovir Hclbrand: Valacyclovir | 42 | 11 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$2,386 across 16 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
Additional practice locations (1)
- 299 W Tietan StWalla Walla, WA 99362-4363Phone: (509) 525-2100Fax: (509) 522-0313
Registry dates
- Enumerated
- 2007-08-29
- Last updated
- 2026-02-22
- Certified
- 2026-02-22
Frequently asked questions
- What is William Yang's NPI number?
- William Yang's National Provider Identifier (NPI) is 1790979011, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Yang's specialty?
- William Yang is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is William Yang located?
- William Yang's practice location on file with NPPES is 2020 W Iles Ave, Springfield, IL 62704-7015.
- What is William Yang's phone number?
- The practice phone number listed in the NPPES registry for William Yang is (217) 698-3030.
- Does William Yang accept Medicare?
- William Yang is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Yang's NPI active?
- Yes — William Yang's NPI (1790979011) is active in the NPPES registry as of the last update on 2026-02-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.