William M. Klein, MD
Internal Medicine Physician · New Hyde Park, NY
William M. Klein, MD is an internal medicine physician with a practice address in New Hyde Park, New York, and NPI 1659359578, issued on Jan 3, 2006. Check the license (New York 205508, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- William M. Klein
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 205508 NY
Self-reported in NPPES; status is on the state search - Practice location
- 1 Hollow LN Ste 109, New Hyde Park, NY 11042
- Phone
- (516) 627-4433
- Enumerated
- Jan 3, 2006
- Record last updated
- Aug 6, 2026
- Fax
- (516) 627-0552
- Medicare enrollment
- Enrolled (PECOS I20050907000059); accepts Medicare assignment
- Medical or professional school
- Icahn School Of Medicine At Mount Sinai, 1994
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 12,067 in New York → Look up another NPI →
Also registered at 1 Hollow LN Ste 109
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hillary Beberman, D.O.Family Medicine Physician1699726802
- David Edelson, MDInternal Medicine Physician1568440485
Verify William M. Klein 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 205508Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
1% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,149 Medicare Part D claims for 204 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 39 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium210 claims
- Atorvastatin Calcium171 claims
- Amlodipine Besylate159 claims
- Levothyroxine Sodium125 claims
- Metoprolol Succinate110 claims
- Zolpidem Tartrate86 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: $1,663.33
84 payments; by number, the most common kind was food and beverage; the largest payer was Lilly USA, LLC. The 50,334 providers of this specialty with any payment received $1,303.06 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
- North Shore Primary Care Medical Associates PCGreat Neck, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
William M. Klein among 12,067 internal medicine physician records in New York
William M. Klein, MD is one of 12,067 internal medicine 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 2006, is newer than 8% of them.
- NPI issued2006 · 8% of these records are older, 53% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated1994 · median 2002 among the 7,221 with a school on file
- Record last updated2026 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
116 internal medicine physician records list a practice address in New Hyde Park
They are 116 of the 4,217 NPPES records with a practice address in New Hyde Park, and 12,067 internal medicine physician records in New York.
All 12,067 in New York → Every provider in New Hyde Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ethan Ben-Sorek, M.D.New Hyde Park, NY 110421609878305
- David Berger, M.D.Lake Success, NY 110421871591677
- David Cooper, MDLake Success, NY 110421457314114
- David Edelson, MDNew Hyde Park, NY 110421568440485
- Genya Frid, MDNew Hyde Park, NY 110421801858055
- Stuart Hisler, M.D.New Hyde Park, NY 110421053307561
- Scott Kellman, M.D.Lake Success, NY 110421215936000
- Kathleen McCabe, M.D.New Hyde Park, NY 110421770554172
Common questions
What is William M. Klein, MD's NPI number?
William M. Klein, MD's National Provider Identifier (NPI) is 1659359578, issued on Jan 3, 2006. An NPI identifies a provider in billing; it is not a license.
Where is William M. Klein, MD located?
The NPPES record lists a practice address at 1 Hollow LN Ste 109, New Hyde Park, NY, 11042. Phone: (516) 627-4433. Providers update this record themselves, so call before visiting.
How can I verify William M. Klein, MD's license?
NPPES lists New York license number 205508, 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 M. Klein, MD prescribe under Medicare Part D?
In 2024, William M. Klein, MD had 3,149 Medicare Part D claims for 204 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.