William Tsiaras, M.D.
NPI 1376609180 · Ophthalmology Physician · Providence, RI
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Tsiaras, M.D. is a Ophthalmology Physician provider in Providence, RI (NPI 1376609180).
Provider details
- NPI number
- 1376609180
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- 4952 (RI)
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
1,183 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 | 762 | $127 |
| Imaging of Retina92134 | 278 | $41 |
| Imaging of Optic Nerve92133 | 97 | $37 |
| Established Patient Problem Focused Exam of Visual System92012 | 31 | $90 |
| Exam of Visual Field With Extended Testing92083 | 15 | $64 |
Typical Medicare-allowed amounts for these services range $37–$127 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 14 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 287 | 77 |
| Timolol Maleate | 184 | 51 |
| Bimatoprostbrand: Lumigan | 99 | 22 |
| Brimonidine Tartrate | 68 | 12 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 48 | 12 |
| Prednisolone Acetate | 34 | 24 |
| Dorzolamide Hcl | 23 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$139 across 6 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
- 2006-12-28
- Last updated
- 2016-07-18
Frequently asked questions
- What is William Tsiaras's NPI number?
- William Tsiaras's National Provider Identifier (NPI) is 1376609180, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is William Tsiaras's specialty?
- William Tsiaras is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is William Tsiaras located?
- William Tsiaras's practice location on file with NPPES is 78 Baker St, Providence, RI 02905-4417.
- What is William Tsiaras's phone number?
- The practice phone number listed in the NPPES registry for William Tsiaras is (401) 831-4592.
- Does William Tsiaras accept Medicare?
- William Tsiaras is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is William Tsiaras's NPI active?
- Yes — William Tsiaras's NPI (1376609180) is active in the NPPES registry as of the last update on 2016-07-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.