Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Joann Marie Leahy, MD

Radiation Oncology Physician in Bismarck, ND · enumerated 2006 · practices at Bismarck Cancer Center.

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

National Provider Identifier

1972571032

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Registry record

Entity type Individual (Type 1)

Name Ms. Joann Marie Leahy

Credential MD

Sex Female

Practice address 500 N 8th St, Bismarck, ND, 58501

Phone (701) 222-6102

Fax (701) 222-6150

Enumeration date Mar 14, 2006

Last updated in NPPES Mar 26, 2008

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License MD027824E (PA) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 10728 (ND) 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
0009113260006	Medicaid	PA	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Joann Leahy?

Joann Leahy 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.

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.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-26.