William G. Tsiaras, M.D.
Ophthalmology Physician · Providence, RI
William G. Tsiaras, M.D. is an ophthalmology physician with a practice address in Providence, Rhode Island, and NPI 1376609180, issued on Dec 28, 2006. Check the license (Rhode Island 4952, as entered in NPPES) on the Rhode Island Board of Medical Licensure and Discipline; the Medicare figures below come from public CMS files.
- Name
- William G. Tsiaras
- Credential
- M.D.
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 4952 RI
Self-reported in NPPES; status is on the state search - Practice location
- 78 Baker St, Providence, RI 02905
- Phone
- (401) 831-4592
- Enumerated
- Dec 28, 2006
- Record last updated
- Jul 18, 2016 (not updated in 10 years: call before relying on the address or phone)
- Fax
- (401) 831-4643
- Medicaid ID
- 9000834 RI
- Medicare enrollment
- Enrolled (PECOS I20100621000671); accepts Medicare assignment
- Medical or professional school
- Warren Alpert Medical School Of Brown University, 1975
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 85 in Rhode Island → Look up another NPI →
Also registered at 78 Baker St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Leon Back, LICSWClinical Social Worker1720558745
- Josephine Barnds Brown, PAMedical Physician Assistant1043348550
- Fernando Calero Baquerizo, MDInternal Medicine Physician1407197395
- Rosa Constantino, MDInternal Medicine Physician1437786142
- Linda Devincent, LICSWClinical Social Worker1881842813
- Rinchen-Tzo Emgushov, MDInternal Medicine Physician1760477962
Verify William G. Tsiaras in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersRhode Island Board of Medical Licensure and Discipline
Search for license 4952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
40% fewer Medicare Part D claims than the average ophthalmology physician in 2024
916 Medicare Part D claims for 200 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 28% of claims.
Most prescribed
- Latanoprost287 claims
- Timolol Maleate184 claims
- Lumigan99 claims
- Brimonidine Tartrate68 claims
- Dorzolamide-Timolol48 claims
- Prednisolone Acetate34 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
No measured MIPS final score for 2023
CMS assigned the neutral MIPS final score of 75 without scoring Quality, Cost, Promoting Interoperability or Improvement Activities. It is an administrative threshold, so PlainDoctor does not compare it with measured clinicians.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $139.05
6 payments; by number, the most common kind was food and beverage; the largest payer was Abbvie Inc. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
William G. Tsiaras among 85 ophthalmology physician records in Rhode Island
William G. Tsiaras, M.D. is one of 85 ophthalmology physician records with a practice address in Rhode Island. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 22% of them.
- NPI issued2006 · 22% of these records are older, 34% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated1975 · median 1993 among the 55 with a school on file
- Record last updated2016 · 74% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a Rhode Island practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in Rhode Island
There are 85 ophthalmology physician records in Rhode Island.
All 85 in Rhode Island → Every provider in Providence → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Richard Bryan, MDProvidence, RI 029051366428120
- Tineke Chan, M.D.Providence, RI 029051689840068
- Joseph Ducharme, M.D.Providence, RI 029051154487684
- Yoash Enzer, M.D.Providence, RI 029051538154703
- Michael Langue, M.D.Providence, RI 029051265967590
- Philip Rizzuto, MDProvidence, RI 029051710950142
- David Tien, MDProvidence, RI 029051932215316
- Robert Bahr, MDProvidence, RI 029061548246382
Common questions
What is William G. Tsiaras, M.D.'s NPI number?
William G. Tsiaras, M.D.'s National Provider Identifier (NPI) is 1376609180, issued on Dec 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William G. Tsiaras, M.D. located?
The NPPES record lists a practice address at 78 Baker St, Providence, RI, 02905. Phone: (401) 831-4592. Providers update this record themselves, so call before visiting.
How can I verify William G. Tsiaras, M.D.'s license?
NPPES lists Rhode Island license number 4952, as entered by the provider. Search the Rhode Island Board of Medical Licensure and Discipline at https://healthri.mylicense.com/Verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William G. Tsiaras, M.D. prescribe under Medicare Part D?
In 2024, William G. Tsiaras, M.D. had 916 Medicare Part D claims for 200 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is William G. Tsiaras, M.D.'s MIPS final score?
CMS assigned the neutral MIPS final score of 75 for 2023 without scoring any category, so it is not a measured result.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.