Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Ariel Fischer, M.D.

Hematology & Oncology Physician in Poughkeepsie, NY · enumerated 2007 · practices at Optum Medical Care, P.C..

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

National Provider Identifier

1457497554

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Registry record

Entity type Individual (Type 1)

Name Dr. Ariel Fischer

Credential M.D.

Sex Male

Practice address 30 Columbia St, Poughkeepsie, NY, 12601

Phone (845) 231-5600

Fax (845) 231-5489

Enumeration date Jan 29, 2007

Last updated in NPPES Nov 16, 2016

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 159122 (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
01654131	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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Ariel Fischer?

Ariel Fischer is registered in NPPES with the primary taxonomy of Hematology & Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-11-16.