Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Timothy Joseph Ridolfi, M.D.

Colon & Rectal Surgery Physician in Milwaukee, WI · enumerated 2006.

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

National Provider Identifier

1023190386

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Registry record

Entity type Individual (Type 1)

Name Dr. Timothy Joseph Ridolfi

Credential M.D.

Sex Male

Practice address 9200 W Wisconsin Ave, Dept of Surgery - Division of Colorectal Surgery, Milwaukee, WI, 53226

Phone (414) 805-5783

Fax (414) 454-0152

Enumeration date Oct 19, 2006

Last updated in NPPES Jan 10, 2014

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 50126-020 (WI) Secondary

208C00000X Colon & Rectal Surgery Physician Allopathic & Osteopathic Physicians · License 50126 (WI) 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
1023190386	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 Timothy Ridolfi?

Timothy Ridolfi is registered in NPPES with the primary taxonomy of Colon & Rectal Surgery 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 2014-01-10.