Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

John M. Merfeld, MD

Individual provider Family Medicine Physician · NPI 1578550281

John M. Merfeld, MD is registered under Family Practice in LA Crosse, Wisconsin. Graduated from Medical College of Wisconsin in 1995, 31 years ago. Practices with Mayo Clinic Health System-Southwest Wisconsin Region Inc, a 552-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Wisconsin.

Years since qualifying
31
Trained at
Medical College of Wisconsin
Licensed in
WI
In the registry since
2005
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

815 10th St S
LA Crosse, WI 54601-4764
Phone: (608) 782-9760
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 800 West Ave S, La Crosse, WI 54601-8806 — (608) 784-6648

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 38073 (WI)

Record details

NPI number1578550281
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedSeptember 29, 2005
Last updated in NPPESNovember 11, 2021
Certification dateNovember 11, 2021

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyFAMILY PRACTICE
Medical schoolMEDICAL COLLEGE OF WISCONSIN
Graduated 1995 (31 years in practice)
Group practice Mayo Clinic Health System-Southwest Wisconsin Region Inc — 552 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients157
Services billed 428 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Mayo Clinic Health System-Southwest Wisconsin Region Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 552 clinicians in the practice; 12 are shown here.

Other providers in LA Crosse