John A. Johnkoski
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician · Wausau, WI
John A. Johnkoski is a thoracic surgery (cardiothoracic vascular surgery) physician with a practice address in Wausau, Wisconsin, and NPI 1992737035, issued on Jul 7, 2006. Check the license (Wisconsin 39318, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John A. Johnkoski
- Primary taxonomy
- Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician 208G00000X
- License number
- 39318 WI
Self-reported in NPPES; status is on the state search - Practice location
- 425 Pine Ridge Blvd, Wausau, WI 54401
- Phone
- (715) 847-0400
- Enumerated
- Jul 7, 2006
- Record last updated
- Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (715) 847-0401
- Medicaid ID
- 32366900 WI
- Medicare enrollment
- Enrolled (PECOS I20080212000453); accepts Medicare assignment
- Medical or professional school
- University Of Michigan Medical School, 1988
- Entity
- Type 1 · individual
8 nearest thoracic surgery (cardiothoracic vascular surgery) physician records → All 115 in Wisconsin → Look up another NPI →
Also registered at 425 Pine Ridge Blvd
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Elliott AdentCertified Registered Nurse Anesthetist1013453497
- Aaron Anderson, M.D.Anesthesiology Physician1720024870
- Jonathan Bayba, M.D.Anesthesiology Physician1386664068
- Andrew Beaumont, M.D., PH.D.Neurological Surgery Physician1871688135
- Erika Beining, CRNACertified Registered Nurse Anesthetist1245646033
- Zaven Boornazian, M.D.Anesthesiology Physician1558382853
Verify John A. Johnkoski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 39318Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.9 times the Medicare Part D claims of the average thoracic surgery (cardiothoracic vascular surgery) physician in 2024
499 Medicare Part D claims for 93 beneficiaries, against an average of 101 among the 2,587 providers of this specialty who prescribed in Part D. Brand-name drugs were 12% of claims.
Most prescribed
- Amiodarone Hcl59 claims
- Mupirocin53 claims
- Clopidogrel51 claims
- Allopurinol49 claims
- Jardiance32 claims
- Warfarin Sodium26 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 84.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $630.47
11 payments; by number, the most common kind was food and beverage; the largest payer was Atricure, Inc. The 4,047 providers of this specialty with any payment received $7,828.84 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Aspirus Medical Group, Inc.Weston, WI
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John A. Johnkoski among 115 thoracic surgery (cardiothoracic vascular surgery) physician records in Wisconsin
John A. Johnkoski is one of 115 thoracic surgery (cardiothoracic vascular surgery) physician records with a practice address in Wisconsin. 78% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 40% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 64% of these records are
- Graduated1988 · median 1993 among the 74 with a school on file
- Record last updated2007 · 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 208G00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician providers in Wisconsin
There are 115 thoracic surgery (cardiothoracic vascular surgery) physician records in Wisconsin.
All 115 in Wisconsin → Every provider in Wausau → Thoracic Surgery (Cardiothoracic Vascular Surgery) Physician nationwide →
The 8 thoracic surgery (cardiothoracic vascular surgery) physician records with the nearest ZIP codes
- Amanda Eilers, D.O.Wausau, WI 544011427349075
- Ronald Miles, MDWausau, WI 544011184656225
- Anselmo Nunez, MDWausau, WI 544011942496724
- Stephen Thorp, M.D.Wausau, WI 544011790136158
- Thomas Cain, MDMarshfield, WI 544491922011071
- John Douglas Jones, MDMarshfield, WI 544491740380005
- Stephen Kwan, M.D.Marshfield, WI 544491518052356
- Chris Liakonis, DOMarshfield, WI 544491437117512
Common questions
What is John A. Johnkoski's NPI number?
John A. Johnkoski's National Provider Identifier (NPI) is 1992737035, issued on Jul 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John A. Johnkoski located?
The NPPES record lists a practice address at 425 Pine Ridge Blvd, Wausau, WI, 54401. Phone: (715) 847-0400. Providers update this record themselves, so call before visiting.
How can I verify John A. Johnkoski's license?
NPPES lists Wisconsin license number 39318, 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 A. Johnkoski prescribe under Medicare Part D?
In 2024, John A. Johnkoski had 499 Medicare Part D claims for 93 beneficiaries; the average among thoracic surgery (cardiothoracic vascular surgery) physician prescribers was 101. Part D covers Medicare prescriptions only.
What is John A. Johnkoski's MIPS final score?
The 2023 MIPS final score is 84.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.