John F. Merchlewitz, MD
Family Medicine Physician · Onalaska, WI
John F. Merchlewitz, MD is a family medicine physician with a practice address in Onalaska, Wisconsin, and NPI 1609886100, issued on Aug 8, 2006. Check the license (Wisconsin 34858, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John F. Merchlewitz
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 34858 WI
38261 MN
Self-reported in NPPES; status is on the state search - Practice location
- 3111 Gundersen Dr, Onalaska, WI 54650
- Phone
- (608) 775-8630
- Enumerated
- Aug 8, 2006
- Record last updated
- Nov 6, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicaid ID
- 739222200 MN
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 3111 Gundersen Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jeffrey Addison, D.O.Internal Medicine Physician1295268571
- Sarah Almonroeder, PA-CMedical Physician Assistant1598049322
- Joseph Angell, ATCAthletic Trainer1578556056
- Kellie Backman, APNPFamily Nurse Practitioner1639171895
- Janet Bahr, NPAdult Health Nurse Practitioner1619163276
- Kelley Bahr, MDFamily Medicine Physician1366441297
Verify John F. Merchlewitz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 34858Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
95% fewer Medicare Part D claims than the average family medicine physician in 2024
169 Medicare Part D claims for 141 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Doxycycline Monohydrate30 claims
- Prednisone22 claims
- Sulfamethoxazole-Trimethoprim20 claims
- Amoxicillin-Clavulanate Potass12 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.
John F. Merchlewitz among 3,765 family medicine physician records in Wisconsin
John F. Merchlewitz, MD 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 fileNo · 62% of these records are
- Record last updated2015 · 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).
47 family medicine physician records list a practice address in Onalaska
They are 47 of the 568 NPPES records with a practice address in Onalaska, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Onalaska → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Kelley Bahr, MDOnalaska, WI 546501366441297
- Carmen Dargel, MDOnalaska, WI 546501194715698
- Joel Erickson, MDOnalaska, WI 546501225023997
- Nancy Erickson, MDOnalaska, WI 546501457341992
- Kevin Fitzgerald, MDOnalaska, WI 546501730179243
- Mark Jungck, MDOnalaska, WI 546501396735809
- Daniel Maccharles, MDOnalaska, WI 546501205839198
- Paul Molling, DOOnalaska, WI 546501487642674
Common questions
What is John F. Merchlewitz, MD's NPI number?
John F. Merchlewitz, MD's National Provider Identifier (NPI) is 1609886100, issued on Aug 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John F. Merchlewitz, MD located?
The NPPES record lists a practice address at 3111 Gundersen Dr, Onalaska, WI, 54650. Phone: (608) 775-8630. Providers update this record themselves, so call before visiting.
How can I verify John F. Merchlewitz, MD's license?
NPPES lists Wisconsin license number 34858, 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 F. Merchlewitz, MD prescribe under Medicare Part D?
In 2024, John F. Merchlewitz, MD had 169 Medicare Part D claims for 141 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.
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.