Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas Tackman, MD

Internal Medicine Physician in Fort Atkinson, WI · enumerated 2005.

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

National Provider Identifier

1902802416

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas Tackman

Credential MD

Sex Male

Practice address 611 Sherman Ave E, Fort Atkinson, WI, 53538

Phone (920) 563-5571

Fax (920) 563-7705

Enumeration date Jun 21, 2005

Last updated in NPPES Dec 17, 2025

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 30509 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Thomas Tackman?

Thomas Tackman is registered in NPPES with the primary taxonomy of Internal Medicine 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 2025-12-17.