Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Mark E Geller, M.D.

Diagnostic Radiology Physician in New City, NY · enumerated 2005 · practices at Hudson Valley Radiology Associates Pllc.

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

National Provider Identifier

1083604896

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Registry record

Entity type Individual (Type 1)

Name Dr. Mark E Geller

Credential M.D.

Sex Male

Practice address 18 Squadron Blvd, New City, NY, 10956

Phone (845) 634-9729

Fax (845) 708-0488

Enumeration date Oct 24, 2005

Last updated in NPPES Dec 6, 2013

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 173539-1 (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
01055105	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 Mark Geller?

Mark Geller is registered in NPPES with the primary taxonomy of Diagnostic Radiology 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 2013-12-06.