Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thomas S Haas, DO

Anatomic Pathology & Clinical Pathology Physician in Janesville, WI · enumerated 2006.

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

National Provider Identifier

1821177973

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Thomas S Haas

Credential DO

Sex Male

Practice address 1000 Mineral Point Ave, Janesville, WI, 53548

Phone (608) 756-6000

Enumeration date Nov 2, 2006

Last updated in NPPES Nov 5, 2007

Taxonomy & licenses

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 32798 (WI) Primary

207ZP0102X Anatomic Pathology & Clinical Pathology Physician Allopathic & Osteopathic Physicians · License 036-088894 (IL) Secondary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
036088894 2	Medicaid	IL	-
43500300	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

Is NPI 1821177973 active?

Yes, as of the latest NPPES snapshot, NPI 1821177973 is active (record last updated 2007-11-05).

How do I verify Thomas Haas's NPI record?

Cross-check NPI 1821177973 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-11-05.