Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Thomas J Ansfield, M.D.

Internal Medicine Physician in Madison, WI · enumerated 2006 · practices at Associated Physicians, LLP.

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

National Provider Identifier

1700848538

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Registry record

Entity type Individual (Type 1)

Name Dr. Thomas J Ansfield

Credential M.D.

Sex Male

Practice address 4410 Regent St, Madison, WI, 53705

Phone (608) 233-9746

Enumeration date Apr 5, 2006

Last updated in NPPES Apr 29, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 16119-020 (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
31014300	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

How do I verify Thomas Ansfield's NPI record?

Cross-check NPI 1700848538 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1700848538 active?

Yes, as of the latest NPPES snapshot, NPI 1700848538 is active (record last updated 2008-04-29).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-04-29.