Maria Kostantacos
- Gender: Female
- Experience: 8 years
- Graduation year: 2013
- Sole propriator: No
- NPI: 1538493614
Maria Kostantacos APRN, FNP
Family Nurse Practitioner
She is located at 1010 North Washington Street in Janesville, WI 53548. Can help patients with the following: Common Cold, Diabetes, Insomnia, Obesity, Prescription Refill, Women's Health. Her National Provider Identifier (NPI) number is 1538493614. Appointment can be made via the phone number (608) 741-3800. She is affiliated with 1 hospitals.
Conditions treated
Maria Kostantacos, being an family nurse practitioner, treats the following conditions. Please be advised that this list may not be complete. For the full list of conditions treated, consult directly with Maria Kostantacos.
- Acne
- Allergies
- Anxiety
- Arthritis
- Asthma
- Attention-Deficit/Hyperactivity Disorder (ADHD)
- Child or Adolescent
- Common Cold
- Depression
- Diabetes
- Fever
- General Care
- Gynecological Exam
- Headache
- High Cholesterol
- Hypertension
- Influenza
- Insomnia
- Migraine
- Nausea and Vomiting
- Obesity
- Prescription Refill
- Sexually Transmitted Diseases (STDs)
- Weight Loss
- Women's Health
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Maria Kostantacos as in-network for the following 2026 plans.
Health plans
MercyCare Health Plans
Network data as of Sep 15, 2026, as reported by the insurer.
Show all 6 plans from MercyCare Health Plans
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| MercyCare Bronze 10,000 (1 Free PCP Visit) | HMO · Bronze | Preferred | Accepting new patients |
| MercyCare Bronze Standard Expanded | HMO · Expanded Bronze | Preferred | Accepting new patients |
| MercyCare Gold Standard | HMO · Gold | Preferred | Accepting new patients |
| MercyCare Silver 2,500 (3 Free PCP Visits) | HMO · Silver | Preferred | Accepting new patients |
| MercyCare Silver Health Savings | HMO · Silver | Preferred | Accepting new patients |
| MercyCare Silver Standard | HMO · Silver | Preferred | Accepting new patients |
This covers ACA Marketplace plans only, as reported by each insurer. It does not include employer, Medicare Advantage, or state-run exchange plans, and a plan missing from this list does not mean Maria Kostantacos is out of network. Insurer directories can be out of date, so always confirm with the insurer and the office before your visit.
Medicare Enrollment
Maria Kostantacos is enrolled to bill Medicare as a Practitioner - Nurse Practitioner .
Bills through: Mercy Health System Corporation
Based on Medicare's public enrollment records as of Jul 17, 2026. This reflects Medicare fee-for-service enrollment only and says nothing about other insurance, quality, outcomes, or board certification.
Studies
Graduated in 2013Additional Specialities
- Nurse Practitioner
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Questions & Answers
Has Maria Kostantacos affiliation with hospitals?
Maria Kostantacos is affiliated with MERCY HEALTH SYSTEM CORP.
Does Maria Kostantacos accept patients with MercyCare Health Plans?
Yes, Maria Kostantacos is listed in-network for MercyCare Health Plans through the ACA Marketplace (Obamacare/HealthCare.gov). See the Marketplace plans section for details.
Where can you meet with Maria Kostantacos?
Maria Kostantacos's office is located at 1010 North Washington Street in Janesville, WI 53548.
What conditions does Maria Kostantacos treat?
Maria Kostantacos provides treatment for Common Cold, Diabetes, Insomnia, Obesity, Prescription Refill, Women's Health. For the full list see this list.