William S. Kass, MD
Ophthalmology Physician · New York, NY
William S. Kass, MD is an ophthalmology physician with a practice address in New York, New York, and NPI 1104386218, issued on Mar 24, 2019. Check the license (New York 321874, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- William S. Kass
- Credential
- MD
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License number
- 321874 NY
Self-reported in NPPES; status is on the state search - Practice location
- 188 Dyckman St, New York, NY 10040
- Phone
- (646) 762-2020
- Enumerated
- Mar 24, 2019
- Record last updated
- Jun 27, 2023
- Fax
- (212) 567-2730
- Medicare enrollment
- Enrolled (PECOS I20230927002217); accepts Medicare assignment
- Medical or professional school
- Rutgers New Jersey Medical School, 2019
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 1,822 in New York → Look up another NPI →
Also registered at 188 Dyckman St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Miguel Baron, PHARMACISTPharmacist1508049347
- Ashley Ireland, ODOptometrist1497421754
Verify William S. Kass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 321874Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
9% more Medicare Part D claims than the average ophthalmology physician in 2024
1,654 Medicare Part D claims for 325 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 43% of claims.
Most prescribed
- Latanoprost514 claims
- Brimonidine Tartrate212 claims
- Dorzolamide-Timolol188 claims
- Prednisolone Acetate150 claims
- Vyzulta96 claims
- Combigan56 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.
Industry payments in 2024: $79.15
4 payments; by number, the most common kind was food and beverage; the largest payer was Bausch & Lomb Americas 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.
Bills Medicare through one group practice
- Sajid Malik, MD PCNew York, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William S. Kass among 1,822 ophthalmology physician records in New York
William S. Kass, MD is one of 1,822 ophthalmology physician records with a practice address in New York. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 94% of them.
- NPI issued2019 · 94% of these records are older, 5% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 67% of these records are
- Graduated2019 · median 1995 among the 1,215 with a school on file
- Record last updated2023 · 71% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in New York
There are 1,822 ophthalmology physician records in New York.
All 1,822 in New York → Every provider in New York → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Paul Frank, M.D.New York, NY 100401447308945
- Lucien Mayer-Cesiano, MDNew York, NY 100401912916032
- Stephen Doro, M.D.New York, NY 100381194739284
- Sandra Comerie - Smith, M.D.New York, NY 100371265451421
- Lynnette Williams, M.D.New York, NY 100371740203355
- Anthony Adamis, M.D.New York, NY 100361104863117
- Steven Stetson, M.D.New York, NY 100361487603411
- Elliott Feinman, MDNew York, NY 100341679583553
Common questions
What is William S. Kass, MD's NPI number?
William S. Kass, MD's National Provider Identifier (NPI) is 1104386218, issued on Mar 24, 2019. An NPI identifies a provider in billing; it is not a license.
Where is William S. Kass, MD located?
The NPPES record lists a practice address at 188 Dyckman St, New York, NY, 10040. Phone: (646) 762-2020. Providers update this record themselves, so call before visiting.
How can I verify William S. Kass, MD's license?
NPPES lists New York license number 321874, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does William S. Kass, MD prescribe under Medicare Part D?
In 2024, William S. Kass, MD had 1,654 Medicare Part D claims for 325 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
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.