NPI Portal NPI Lookup & Verification

Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Hematology Oncology Associates of Rockland,PC

Hematology & Oncology Physician in Nyack, NY · enumerated 2007 · authorized official Len Natelson, Ceo.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1134339781

Verified

See something wrong? Report a correction

Registry record

Entity type Organization (Type 2)
Legal business name Hematology Oncology Associates of Rockland,PC
Practice address 255 Fifth Ave, Nyack, NY, 10960
Phone (845) 362-1750
Fax (845) 362-1577
Enumeration date May 23, 2007
Last updated in NPPES Jun 21, 2010

Taxonomy & classification

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Len Natelson
Title Ceo
Phone (845) 362-1750

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What type of organization is Hematology Oncology Associates of Rockland,PC?
Hematology Oncology Associates of Rockland,PC is registered in NPPES as a Hematology & Oncology Physician (its primary provider taxonomy).
What is a Type 2 NPI?
A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

Providers at this address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-06-21.