John W. Constantakis, DO
Emergency Medicine Physician · Madison, WI
John W. Constantakis, DO is an emergency medicine physician with a practice address in Madison, Wisconsin, and NPI 1669051405, issued on Apr 7, 2021. Check the license (Wisconsin 77601-21, as entered in NPPES) on the Wisconsin Medical Examining Board; the Medicare figures below come from public CMS files.
- Name
- John W. Constantakis
- Credential
- DO
- Primary taxonomy
- Emergency Medicine Physician 207P00000X
- License number
- 77601-21 WI
Self-reported in NPPES; status is on the state search - Practice location
- 800 University Bay Dr Ste 300, Madison, WI 53705
- Phone
- (608) 264-3093
- Enumerated
- Apr 7, 2021
- Record last updated
- Sep 8, 2023
- Entity
- Type 1 · individual
8 nearest emergency medicine physician records → All 1,464 in Wisconsin → Look up another NPI →
Verify John W. Constantakis in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWisconsin Medical Examining Board
Search for license 77601-21Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average emergency medicine physician in 2024
52 Medicare Part D claims for 39 beneficiaries, against an average of 226 among the 54,106 providers of this specialty who prescribed in Part D.
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 W. Constantakis among 1,464 emergency medicine physician records in Wisconsin
John W. Constantakis, DO is one of 1,464 emergency medicine physician records with a practice address in Wisconsin. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 91% of them.
- NPI issued2021 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileNo · 58% of these records are
- Record last updated2023 · 50% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207P00000X and a Wisconsin practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
241 emergency medicine physician records list a practice address in Madison
They are 241 of the 15,014 NPPES records with a practice address in Madison, and 1,464 emergency medicine physician records in Wisconsin.
All 1,464 in Wisconsin → Every provider in Madison → Emergency Medicine Physician nationwide →
The 8 emergency medicine physician records with the nearest ZIP codes
- James Berbee, M.D.Madison, WI 537051720376015
- Jamie Hess, M.D.Madison, WI 537051992967343
- Winny Hung, M.D.Madison, WI 537051194766055
- William Jackman, MDMadison, WI 537051841411733
- Nicholas Lepa, M.D.Madison, WI 537051386091668
- Devin Miller, MDMadison, WI 537051760952436
- Eric Neasi, MDMadison, WI 537051053872044
- Eric Ohlrogge, M.D.Madison, WI 537051710413240
Common questions
What is John W. Constantakis, DO's NPI number?
John W. Constantakis, DO's National Provider Identifier (NPI) is 1669051405, issued on Apr 7, 2021. An NPI identifies a provider in billing; it is not a license.
Where is John W. Constantakis, DO located?
The NPPES record lists a practice address at 800 University Bay Dr Ste 300, Madison, WI, 53705. Phone: (608) 264-3093. Providers update this record themselves, so call before visiting.
How can I verify John W. Constantakis, DO's license?
NPPES lists Wisconsin license number 77601-21, 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 W. Constantakis, DO prescribe under Medicare Part D?
In 2024, John W. Constantakis, DO had 52 Medicare Part D claims for 39 beneficiaries; the average among emergency medicine physician prescribers was 226. 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.