Nathaniel J. Fullerton, MD
Internal Medicine Physician · Fort Atkinson, WI
Nathaniel J. Fullerton, MD is an internal medicine physician with a practice address in Fort Atkinson, Wisconsin, and NPI 1366417461, issued on Feb 22, 2006. Check the license (Wisconsin 38510-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Nathaniel J. Fullerton
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 38510-20 WI
Self-reported in NPPES; status is on the state search - Practice location
- 611 E Sherman Ave, Fort Atkinson, WI 53538
- Phone
- (920) 568-5411
- Enumerated
- Feb 22, 2006
- Record last updated
- Apr 11, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (920) 568-4004
- Medicare enrollment
- Enrolled (PECOS I20040907000694); accepts Medicare assignment
- Medical or professional school
- University Of Wisconsin School Of Medicine, 1995
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,078 in Wisconsin → Look up another NPI →
Also registered at 611 E Sherman Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Cichocki, CRNACertified Registered Nurse Anesthetist1588762264
- Jamie Foltz, CRNACertified Registered Nurse Anesthetist1043512791
- Bret Hunt, M.D.Emergency Medicine Physician1629332085
- Jennifer Klenske, MDInternal Medicine Physician1841350022
- Becky Kohl, MS, PA-CPhysician Assistant1811018468
- Chris Suttinger, CST-CFASurgical Assistant1750603684
Verify Nathaniel J. Fullerton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 38510-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,485 Medicare Part D claims for 95 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Atorvastatin Calcium146 claims
- Eliquis143 claims
- Gabapentin75 claims
- Carvedilol69 claims
- Tamsulosin Hcl67 claims
- Potassium Chloride46 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through 2 group practices
- Agnesian Healthcare IncWaupun, WI
- Informe Healthcare IL LLCMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Nathaniel J. Fullerton among 2,078 internal medicine physician records in Wisconsin
Nathaniel J. Fullerton, 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. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 46% newer
- In a Medicare fileYes · 70% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated1995 · median 2002 among the 1,098 with a school on file
- Record last updated2018 · 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).
9 internal medicine physician records list a practice address in Fort Atkinson
They are 9 of the 361 NPPES records with a practice address in Fort Atkinson, and 2,078 internal medicine physician records in Wisconsin.
All 2,078 in Wisconsin → Every provider in Fort Atkinson → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Ailleen Alquinto Anonuevo, M.D.Fort Atkinson, WI 535381417900143
- William Cannon, MDFort Atkinson, WI 535381912971243
- Jennifer Klenske, MDFort Atkinson, WI 535381841350022
- Laura Koenig, M.D.Fort Atkinson, WI 535381700881869
- Kenneth Miller, MDFort Atkinson, WI 535381962543496
- Monica Sharma, MDFort Atkinson, WI 535381962084723
- Thomas Tackman, MDFort Atkinson, WI 535381902802416
- Jennifer Winter, MDFort Atkinson, WI 535381174726038
Common questions
What is Nathaniel J. Fullerton, MD's NPI number?
Nathaniel J. Fullerton, MD's National Provider Identifier (NPI) is 1366417461, issued on Feb 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Nathaniel J. Fullerton, MD located?
The NPPES record lists a practice address at 611 E Sherman Ave, Fort Atkinson, WI, 53538. Phone: (920) 568-5411. Providers update this record themselves, so call before visiting.
How can I verify Nathaniel J. Fullerton, MD's license?
NPPES lists Wisconsin license number 38510-20, 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.
How much does Nathaniel J. Fullerton, MD prescribe under Medicare Part D?
In 2024, Nathaniel J. Fullerton, MD had 1,485 Medicare Part D claims for 95 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. 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.