NPPES file of Aug 9, 2026

John C. Lesniak, M.D.

Family Medicine Physician · Hartland, WI

John C. Lesniak, M.D. is a family medicine physician with a practice address in Hartland, Wisconsin, and NPI 1912979451, issued on Feb 7, 2006. Check the license (Wisconsin 40186, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1912979451
Name
John C. Lesniak
Credential
M.D.
Primary taxonomy
Family Medicine Physician 207Q00000X
License number
40186 WI
Self-reported in NPPES; status is on the state search
Practice location
1500 Walnut Ridge Dr, Hartland, WI 53029
Phone
(262) 928-7500
Enumerated
Feb 7, 2006
Record last updated
Apr 20, 2012 (not updated in 14 years: call before relying on the address or phone)
Medicaid ID
32480400 WI
Medicare enrollment
Enrolled (PECOS I20051205000308); accepts Medicare assignment
Medical or professional school
Medical College Of Wisconsin, 1997
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →

Also registered at 1500 Walnut Ridge Dr

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Kevin Arnold, D.O.Family Medicine Physician1073586392
  2. Lauren Bremberger, M.D.Family Medicine Physician1205192069
  3. Michelle Jansen, DNPFamily Nurse Practitioner1881276848
  4. Karin Kultgen, M.D.Family Medicine Physician1093788309
  5. Kathleen Phelan, M.D.Family Medicine Physician1871566182
  6. Cheryl Serb, M.D.Family Medicine Physician1790758019

Verify John C. Lesniak in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWisconsin Medical Examining Board
    Search for license 40186    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Wisconsin license search

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62% more Medicare Part D claims than the average family medicine physician in 2024

5,749 Medicare Part D claims for 626 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 87 claims were for opioids.

  1. John Lesniak5,749
  2. Specialty average3,544

Most prescribed

  1. Atorvastatin Calcium464 claims
  2. Pravastatin Sodium299 claims
  3. Lisinopril241 claims
  4. Amlodipine Besylate204 claims
  5. Losartan Potassium200 claims
  6. Tamsulosin Hcl186 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 one group practice

  1. Prohealth Medical Group IncOconomowoc, WI

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

John C. Lesniak among 3,765 family medicine physician records in Wisconsin

John C. Lesniak, M.D. is one of 3,765 family medicine physician records with a practice address in Wisconsin. 75% 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 10% of them.

  • NPI issued2006 · 10% of these records are older, 46% newer
  • In a Medicare fileYes · 75% of these records are
  • In the CMS Doctors and Clinicians fileYes · 62% of these records are
  • Graduated1997 · median 2007 among the 2,347 with a school on file
  • Record last updated2012 · 56% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

15 family medicine physician records list a practice address in Hartland

They are 15 of the 193 NPPES records with a practice address in Hartland, and 3,765 family medicine physician records in Wisconsin.

All 3,765 in Wisconsin → Every provider in Hartland → Family Medicine Physician nationwide →

The 8 family medicine physician records with the nearest ZIP codes

  1. Kevin Arnold, D.O.Hartland, WI 530291073586392
  2. David Faust, DOHartland, WI 530291295840320
  3. Ronald Fickel, M.D.Hartland, WI 530291952374365
  4. Rebecca Gallagher, MDHartland, WI 530291063583300
  5. Kirk Hanson, D.O.Hartland, WI 530291659650653
  6. Karin Kultgen, M.D.Hartland, WI 530291093788309
  7. Todd Miller, MDHartland, WI 530291952352486
  8. Kathleen Phelan, M.D.Hartland, WI 530291871566182

Common questions

What is John C. Lesniak, M.D.'s NPI number?

John C. Lesniak, M.D.'s National Provider Identifier (NPI) is 1912979451, issued on Feb 7, 2006. An NPI identifies a provider in billing; it is not a license.

Where is John C. Lesniak, M.D. located?

The NPPES record lists a practice address at 1500 Walnut Ridge Dr, Hartland, WI, 53029. Phone: (262) 928-7500. Providers update this record themselves, so call before visiting.

How can I verify John C. Lesniak, M.D.'s license?

NPPES lists Wisconsin license number 40186, 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 John C. Lesniak, M.D. prescribe under Medicare Part D?

In 2024, John C. Lesniak, M.D. had 5,749 Medicare Part D claims for 626 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.