Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John William Leidy Jr., M.D.-PH.D.

Endocrinology, Diabetes & Metabolism Physician in Huntington, WV · enumerated 2006 · practices at Marshall Pharmacy Inc..

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

National Provider Identifier

1528174059

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Registry record

Entity type Individual (Type 1)

Name Dr. John William Leidy Jr.

Credential M.D.-PH.D.

Sex Male

Practice address 1249 15th Street, Department of Medicine, Jc Edwards School of Medicine, Huntington, WV, 25701

Phone (304) 691-1050

Fax (304) 429-0290

Enumeration date Aug 21, 2006

Last updated in NPPES Dec 30, 2021

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 14767 (WV) Secondary

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License 14767 (WV) Primary

Other identifiers

Identifier	Type	State	Issuer
6003532	Medicaid	WV	-

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

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.

What specialty is John Leidy?

John Leidy is registered in NPPES with the primary taxonomy of Endocrinology, Diabetes & Metabolism Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-12-30.