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Dr. Norman M. Callahan, D.O.

Gastroenterology Physician in Malvern, PA · enumerated 2006.

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

National Provider Identifier

1851367783

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Registry record

Entity type Individual (Type 1)
Name Dr. Norman M. Callahan
Credential D.O.
Sex Male
Practice address 325 Central Ave, 2nd Floor, Malvern, PA, 19355
Phone (610) 644-6755
Fax (610) 647-2063
Enumeration date Feb 28, 2006
Last updated in NPPES Aug 5, 2009

Taxonomy & licenses

207RG0100X Gastroenterology Physician Allopathic & Osteopathic Physicians · License OS007658-L (PA) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier Type State Issuer
1722646 Medicaid PA -
100013312 Other PA RAILROAD MEDICARE

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

Where does Norman Callahan practice?
The practice location on file with NPPES is in Malvern, PA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for Norman Callahan?
The National Provider Identifier (NPI) for Norman Callahan is 1851367783, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-05.