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

Jonathan R Ernst, MD

Individual provider Internal Medicine Physician · NPI 1548675697

Jonathan R Ernst, MD is registered under Family Practice in Madison, Wisconsin. Qualified in 2014, 12 years ago. Practices with Dean Health Systems Inc, a 1,184-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Wisconsin.

Years since qualifying
12
Licensed in
WI
In the registry since
2014
Specialties on file
3
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1211 Fish Hatchery Rd
Madison, WI 53715-1909
Phone: (608) 252-8000
Fax: (608) 283-7160
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 1313 Fish Hatchery Rd, Madison, WI 53715-1911 — (608) 252-8000

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 67864-20 (WI)
Internal Medicine Physician Taxonomy 207R00000X · Licence 67864-20 (WI)
Pediatrics Physician Taxonomy 208000000X · Licence 67864-20 (WI)

Record details

NPI number1548675697
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 27, 2014
Last updated in NPPESMay 24, 2022
Certification dateMay 24, 2022

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Also practisesINTERNAL MEDICINE, PEDIATRIC MEDICINE
Medical schoolOTHER
Graduated 2014 (12 years in practice)
Group practice Dean Health Systems Inc — 1184 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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 or shaving of skin growth 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 patients294
Services billed 448 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

  • Columbus Community Hospital Hospital · Columbus, WI · listed as Columbus Community Hospital Inc
  • Stoughton Hospital Hospital · Stoughton, WI · listed as Stoughton Hospital Association
  • Ssm Health St Clare Hospital - Baraboo Hospital · Baraboo, WI
  • Ssm Health St Mary'S Hospital - Madison Hospital · Madison, WI

Colleagues at Dean Health Systems Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1184 clinicians in the practice; 12 are shown here.

Other providers in Madison