Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Karen Patricia Seiter, M.D.

Hematology & Oncology Physician in Hawthorne, NY · enumerated 2006.

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

National Provider Identifier

1265494124

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Registry record

Entity type Individual (Type 1)

Name Karen Patricia Seiter

Credential M.D.

Sex Female

Practice address 19 Bradhurst Ave, Suite 2100, Hawthorne, NY, 10532

Phone (914) 493-8375

Fax (914) 347-1832

Enumeration date Apr 5, 2006

Last updated in NPPES Oct 10, 2025

Taxonomy & licenses

207RH0000X Hematology (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 83187 (CT) Secondary

207RX0202X Medical Oncology Physician Allopathic & Osteopathic Physicians · License 83187 (CT) Secondary

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 83187 (CT) 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
01269112	Medicaid	NY	-

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 Karen Seiter's NPI record?

Cross-check NPI 1265494124 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1265494124 active?

Yes, as of the latest NPPES snapshot, NPI 1265494124 is active (record last updated 2025-10-10).

Other providers at this practice address

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Martin Cohen Cardiovascular Disease Physician · Hawthorne, NY NPI 1437152618 Arun Goyal Vascular Surgery Physician · Hawthorne, NY NPI 1447253570 Anthony Pucillo Cardiovascular Disease Physician · Hawthorne, NY NPI 1619970530 Patricia Kilcullen Adult Health Nurse Practitioner · Hawthorne, NY NPI 1316940190 Richard Kay Cardiovascular Disease Physician · Hawthorne, NY NPI 1326041393 Jae Ro Cardiovascular Disease Physician · Hawthorne, NY NPI 1184627085 Warren Rosenblum Cardiovascular Disease Physician · Hawthorne, NY NPI 1528061413 Pravin Shah Vascular Surgery Physician · Hawthorne, NY NPI 1326041211

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-10.