Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. John M Callahan, MD

Hospitalist Physician in Syracuse, NY · enumerated 2005.

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

National Provider Identifier

1568454528

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Registry record

Entity type Individual (Type 1)

Name Mr. John M Callahan

Credential MD

Sex Male

Practice address 301 Prospect Ave, Hospital Internists, Syracuse, NY, 13203

Phone (315) 448-5704

Fax (315) 423-6853

Enumeration date Aug 16, 2005

Last updated in NPPES Apr 8, 2013

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 208546 (NY) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 208546 (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
P00927986	Other	NY	RAILROAD MEDICARE PTAN
01936736	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

What is the NPI number for John Callahan?

The National Provider Identifier (NPI) for John Callahan is 1568454528, a Type 1 (individual) record in the CMS NPPES registry.

Where does John Callahan practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-04-08.