William L. Nelson, MD
Internal Medicine Physician · Neenah, WI
William L. Nelson, MD is an internal medicine physician with a practice address in Neenah, Wisconsin, and NPI 1154316396, issued on Sep 14, 2005. Check the license (Wisconsin 20629, as entered in NPPES) on the Wisconsin Medical Examining Board; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- William L. Nelson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 20629 WI
Self-reported in NPPES; status is on the state search - Practice location
- 101 Main St, Neenah, WI 54956
- Phone
- (920) 727-4220
- Enumerated
- Sep 14, 2005
- Record last updated
- Nov 6, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicaid ID
- 30980500 WI
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 101 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- James Burns, MDInternal Medicine Physician1225022080
- Rachel CollarMedical Physician Assistant1235004706
- Stephen Cruz, MDFamily Medicine Physician1043204951
- Sara Hartman, NPFamily Nurse Practitioner1821220534
- Kelsey Kienert, M.D.Internal Medicine Physician1134501190
- Kaylee LeroyFamily Nurse Practitioner1417491606
Verify William L. Nelson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 20629Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
William L. Nelson among 2,078 internal medicine physician records in Wisconsin
William L. Nelson, MD is one of 2,078 internal medicine physician records with a practice address in Wisconsin. 70% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 91% newer
- In a Medicare fileNo · 70% of these records are
- In the CMS Doctors and Clinicians fileNo · 53% of these records are
- Record last updated2012 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 internal medicine physician records list a practice address in Neenah
They are 22 of the 919 NPPES records with a practice address in Neenah, 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 2,078 in Wisconsin → Every provider in Neenah → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Curtis Baltz, MDNeenah, WI 549561316939325
- Michael Beckett, MDNeenah, WI 549561417941337
- James Burns, MDNeenah, WI 549561225022080
- Thomas Duncan, MDNeenah, WI 549561588641039
- Mark Hermans, MDNeenah, WI 549561386676948
- Roxanne Jadin Cardelli, MDNeenah, WI 549561750339040
- Steven Knaus, MDNeenah, WI 549561457332215
- Paul McAvoy, MDNeenah, WI 549561992799779
Common questions
What is William L. Nelson, MD's NPI number?
William L. Nelson, MD's National Provider Identifier (NPI) is 1154316396, issued on Sep 14, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William L. Nelson, MD located?
The NPPES record lists a practice address at 101 Main St, Neenah, WI, 54956. Phone: (920) 727-4220. Providers update this record themselves, so call before visiting.
How can I verify William L. Nelson, MD's license?
NPPES lists Wisconsin license number 20629, 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.