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William Porter

Radiation Oncology Physician in Madison, IN · enumerated 2010.

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

National Provider Identifier

1245530203

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Registry record

Entity type Individual (Type 1)
Name William Porter
Sex Male
Practice address 1373 E Sr 62, Madison, IN, 47250
Phone (812) 801-0603
Fax (812) 801-0589
Enumeration date Oct 25, 2010
Last updated in NPPES Dec 8, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 57018444 (OH) Secondary
2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 01075594A (IN) Primary

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 William Porter?
William Porter is registered in NPPES with the primary taxonomy of Radiation Oncology 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 2020-12-08.