Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Hurwitz, M.D.

Radiation Oncology Physician in Valhalla, NY · enumerated 2006.

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

National Provider Identifier

1891751046

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Registry record

Entity type Individual (Type 1)

Name Mark Hurwitz

Credential M.D.

Sex Male

Practice address 100 Woods Rd, Valhalla, NY, 10595

Phone (914) 493-8561

Enumeration date Apr 25, 2006

Last updated in NPPES Jan 10, 2022

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 154594 (MA) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License MD447072 (PA) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 312777 (NY) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
102763459	Medicaid	PA	-
0310816	Medicaid	NJ	-

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.

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Frequently asked questions

How do I verify Mark Hurwitz's NPI record?

Cross-check NPI 1891751046 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1891751046 active?

Yes, as of the latest NPPES snapshot, NPI 1891751046 is active (record last updated 2022-01-10).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-01-10.