Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

William M Klein, MD

Individual provider Internal Medicine Physician · NPI 1659359578

William M Klein, MD is a General Practice in New Hyde Park, New York. Graduated from Icahn School of Medicine at Mount Sinai in 1994, 32 years ago. Practices with North Shore Primary Care Medical Associates PC, a 6-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in New York.

Years since qualifying
32
Trained at
Icahn School of Medicine at Mount Sinai
Licensed in
NY
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1 Hollow Ln Ste 109
New Hyde Park, NY 11042-1215
Phone: (516) 627-4433
Fax: (516) 627-0552
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1000 Northern Blvd Ste 230, Great Neck, NY 11021-5341 — (516) 627-4433

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 205508 (NY)

Record details

NPI number1659359578
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJanuary 3, 2006
Last updated in NPPESAugust 6, 2026
Certification dateAugust 6, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyGENERAL PRACTICE
Medical schoolICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
Graduated 1994 (32 years in practice)
Group practice North Shore Primary Care Medical Associates Pc — 6 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Other providers in New Hyde Park