Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Kathleen Mary Powell Mattioli, MD

Obstetrics & Gynecology Physician in West Allis, WI · enumerated 2007.

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

National Provider Identifier

1457530446

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Registry record

Entity type Individual (Type 1)

Name Kathleen Mary Powell Mattioli

Credential MD

Sex Female

Practice address 8905 W Lincoln Ave, Suite 501, West Allis, WI, 53227

Phone (414) 978-2229

Fax (414) 978-2279

Enumeration date Oct 26, 2007

Last updated in NPPES Jun 7, 2023

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 49339 (WI) Primary

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License 036-163299 (IL) Secondary

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
35336200	Medicaid	WI	-

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 Kathleen Powell Mattioli?

Kathleen Powell Mattioli is registered in NPPES with the primary taxonomy of Obstetrics & Gynecology 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-06-07.