Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Olin P Callaghan, PA

Physician Assistant in Delmar, NY · enumerated 2005.

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

National Provider Identifier

1902891930

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Registry record

Entity type Individual (Type 1)

Name Mr. Olin P Callaghan

Credential PA

Sex Male

Practice address 250 Delaware Ave Ste 100, Delmar, NY, 12054

Phone (518) 439-8077

Fax (518) 439-8070

Enumeration date Sep 15, 2005

Last updated in NPPES Apr 22, 2021

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 009711 (NY) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

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 is the NPI number for Olin Callaghan?

The National Provider Identifier (NPI) for Olin Callaghan is 1902891930, a Type 1 (individual) record in the CMS NPPES registry.

Where does Olin Callaghan practice?

The practice location on file with NPPES is in Delmar, NY. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-04-22.