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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Steven O Hiaasen, M.D.

Radiation Oncology Physician in Sun City, AZ · enumerated 2005.

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

National Provider Identifier

1558368241

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Registry record

Entity type Individual (Type 1)
Name Steven O Hiaasen
Credential M.D.
Sex Male
Practice address 13184 N 103rd Dr, Sun City, AZ, 85351
Phone (623) 972-2902
Fax (623) 972-2539
Enumeration date Jul 7, 2005
Last updated in NPPES Sep 26, 2007

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 18654 (AZ) 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
18654 Other AZ STATE LICENSE

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 NPI 1558368241 active?
Yes, as of the latest NPPES snapshot, NPI 1558368241 is active (record last updated 2007-09-26).
How do I verify Steven Hiaasen's NPI record?
Cross-check NPI 1558368241 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-09-26.