Jonathan R. Ernst, MD
Family Medicine Physician · Madison, WI
Jonathan R. Ernst, MD is a family medicine physician with a practice address in Madison, Wisconsin, and NPI 1548675697, issued on Jun 27, 2014. Check the license (Wisconsin 67864-20, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- Jonathan R. Ernst
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 67864-20 WI
Self-reported in NPPES; status is on the state search - Practice location
- 1211 Fish Hatchery RD, Madison, WI 53715
- Phone
- (608) 252-8000
- Enumerated
- Jun 27, 2014
- Record last updated
- May 24, 2022
- Fax
- (608) 283-7160
- Medicaid ID
- 1548675697 WI
- Medicare enrollment
- Enrolled (PECOS I20171113000919); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,765 in Wisconsin → Look up another NPI →
Also registered at 1211 Fish Hatchery RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Caroline Aaberg, APNPNurse Practitioner1881384394
- Michelle Adler-Gronski, PA-CPhysician Assistant1265499487
- Heidi Allen-Bregman, APNPNurse Practitioner1255380424
- Douglas Arnold, M.D.Orthopaedic Surgery Physician1770788267
- Emily Beaman, CNMAdvanced Practice Midwife1285037325
- Bridget Bellissimo, PA-CPhysician Assistant1093435091
Verify Jonathan R. Ernst in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 67864-20Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% fewer Medicare Part D claims than the average family medicine physician in 2024
908 Medicare Part D claims for 331 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. 17 claims were for opioids.
Most prescribed
- Atorvastatin Calcium39 claims
- Losartan Potassium34 claims
- Amoxicillin-Clavulanate Potass32 claims
- Levothyroxine Sodium27 claims
- Tamsulosin Hcl26 claims
- Doxycycline Hyclate25 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
- Dean Health Systems IncMadison, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jonathan R. Ernst among 3,765 family medicine physician records in Wisconsin
Jonathan R. Ernst, 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 2014, is newer than 74% of them.
- NPI issued2014 · 74% of these records are older, 24% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2014 · median 2007 among the 2,347 with a school on file
- Record last updated2022 · 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).
284 family medicine physician records list a practice address in Madison
They are 284 of the 15,014 NPPES records with a practice address in Madison, and 3,765 family medicine physician records in Wisconsin.
All 3,765 in Wisconsin → Every provider in Madison → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Mark Beamsley, MDMadison, WI 537151306807698
- Lee Dresang, MDMadison, WI 537151932151016
- Valerie Gilchrist, MDMadison, WI 537151538143912
- Elaine Hirschfield, MDMadison, WI 537151841265758
- Zinije Jonuzi, MDMadison, WI 537151285603472
- William Kinsey, MDMadison, WI 537151376545939
- Louise Latterell, M.D.Madison, WI 537151972567873
- Debra Nyquist, MDMadison, WI 537151972580512
Common questions
What is Jonathan R. Ernst, MD's NPI number?
Jonathan R. Ernst, MD's National Provider Identifier (NPI) is 1548675697, issued on Jun 27, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Jonathan R. Ernst, MD located?
The NPPES record lists a practice address at 1211 Fish Hatchery RD, Madison, WI, 53715. Phone: (608) 252-8000. Providers update this record themselves, so call before visiting.
How can I verify Jonathan R. Ernst, MD's license?
NPPES lists Wisconsin license number 67864-20, 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 Jonathan R. Ernst, MD prescribe under Medicare Part D?
In 2024, Jonathan R. Ernst, MD had 908 Medicare Part D claims for 331 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.