John Constantakis, DO
NPI 1669051405 · Emergency Medicine Physician · Madison, WI
Enrolled with Medicare as Order and Referring Only - Neurology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Constantakis, DO is a Emergency Medicine Physician provider in Madison, WI (NPI 1669051405).
Provider details
- NPI number
- 1669051405
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 77601-21 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Student, Health Care
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
5 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2021-04-07
- Last updated
- 2023-09-08
- Certified
- 2023-09-08
Frequently asked questions
- What is John Constantakis's NPI number?
- John Constantakis's National Provider Identifier (NPI) is 1669051405, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Constantakis's specialty?
- John Constantakis is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Constantakis located?
- John Constantakis's practice location on file with NPPES is 800 University Bay Dr Ste 300, Madison, WI 53705-2299.
- What is John Constantakis's phone number?
- The practice phone number listed in the NPPES registry for John Constantakis is (608) 264-3093.
- Does John Constantakis accept Medicare?
- John Constantakis is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Constantakis's NPI active?
- Yes — John Constantakis's NPI (1669051405) is active in the NPPES registry as of the last update on 2023-09-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.