Thomas J. Ansfield, M.D.
Internal Medicine Physician · Madison, WI
Thomas J. Ansfield, M.D. is an internal medicine physician with a practice address in Madison, Wisconsin, and NPI 1700848538, issued on Apr 5, 2006. Check the license (Wisconsin 16119-020, as entered in NPPES) on the Wisconsin Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Thomas Ansfield
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 16119-020 WI
Self-reported in NPPES; status is on the state search - Practice location
- 4410 Regent St, Madison, WI 53705
- Phone
- (608) 233-9746
- Enumerated
- Apr 5, 2006
- Record last updated
- Apr 29, 2008 (not updated in 18 years: call before relying on the address or phone)
- Medicaid ID
- 31014300 WI
- Entity
- Type 1 · individual
Also registered at 4410 Regent St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Casey Birschbach, MDInternal Medicine Physician1366005928
- Amy Buencamino, M.D.Pediatrics Physician1619939493
- Puneet Dhillon, M.D.Internal Medicine Physician1073855474
- Nicole Ertl, M.D.Pediatrics Physician1457664385
- John Ewalt, M.D.Internal Medicine Physician1518923283
- Amy Fothergill, M.D.Internal Medicine Physician1063646370
Verify Thomas Ansfield in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 16119-020Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
417 internal medicine physician records list a practice address in Madison
They are 417 of the 15,014 NPPES records with a practice address in Madison, and 2,078 internal medicine physician records in Wisconsin. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 417 in Madison → All 2,078 in Wisconsin → Every provider in Madison →
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- Margaret Abel, MDRhinelander, WI1477590487
- Mesfin Abera, M.D.Beaver Dam, WI1972852390
- Vidthya Abraham, M.D.Madison, WI1861836058
- Ismael Abu Limon, MDGreenfield, WI1467945543
- Amjed Abu Muhanna, MDMarinette, WI1861514135
- Satish Achanti, MDAppleton, WI1982711198
Common questions
What is Thomas J. Ansfield, M.D.'s NPI number?
Thomas J. Ansfield, M.D.'s National Provider Identifier (NPI) is 1700848538, issued on Apr 5, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas J. Ansfield, M.D. located?
The NPPES record lists a practice address at 4410 Regent St, Madison, WI, 53705. Phone: (608) 233-9746. Providers update this record themselves, so call before visiting.
How can I verify Thomas J. Ansfield, M.D.'s license?
NPPES lists Wisconsin license number 16119-020, as entered by the provider. Search the Wisconsin Medical Examining Board at https://dsps.wi.gov/Pages/BoardsCouncils/MEB/Default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.