Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William K Riordan, DO

Diagnostic Radiology Physician in Petoskey, MI · enumerated 2005.

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

National Provider Identifier

1447259718

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Registry record

Entity type Individual (Type 1)

Name William K Riordan

Credential DO

Sex Male

Practice address 416 Connable Ave, Petoskey, MI, 49770

Phone (231) 487-4000

Enumeration date Jul 19, 2005

Last updated in NPPES Aug 13, 2018

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 5101010779 (MI) 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
300088078	Other	MI	RAILROAD MEDICARE
3052422495	Other	MI	BCBS
113497443	Medicaid	MI	-

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

How do I verify William Riordan's NPI record?

Cross-check NPI 1447259718 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1447259718 active?

Yes, as of the latest NPPES snapshot, NPI 1447259718 is active (record last updated 2018-08-13).

Other providers at this practice address

Browse all →

Michael Angileri Diagnostic Radiology Physician · Petoskey, MI NPI 1073512687 Northern Imaging Associates P C Diagnostic Radiology Physician · Petoskey, MI NPI 1801895412 William Henry Diagnostic Radiology Physician · Petoskey, MI NPI 1205835824 Anthony Pucci Diagnostic Radiology Physician · Petoskey, MI NPI 1922007582 Janice Schwinke Diagnostic Radiology Physician · Petoskey, MI NPI 1558360727 Northern Pathology Associates, PC Specialist · Petoskey, MI NPI 1578546420 Marcia Shattuck Anatomic Pathology & Clinical Pathology Physician · Petoskey, MI NPI 1902889868 Judith Hoschner Specialist · Petoskey, MI NPI 1063495927

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-08-13.