Dr. John G. Mellas
- Gender: Male
- Experience: 44 years
- Graduated from: University Of Illinois College Of Med (chi/peor/rock/chm-urb)
- Graduation year: 1977
- Sole propriator: No
- NPI: 1497712079
Dr. John G. Mellas MD
Nephrologist
He is located at 1011 Bowles Avenue Suite 220 in Fenton, MO 63026. Can help patients with the following: Atherosclerosis, Chest Pain, Cystitis, Inguinal Hernia, Low Potassium, Nausea and Vomiting. His National Provider Identifier (NPI) number is 1497712079. Appointment can be made via the phone number (636) 681-3030. He is affiliated with 2 practices and 5 hospitals.
Conditions treated
Dr. John Mellas, being an nephrologist, treats the following conditions. Please be advised that this list may not be complete. For the full list of conditions treated, consult directly with Dr. John G. Mellas.
- Abdominal Pain
- Acute Pain
- Anemia
- Arthritis
- Asthma
- Atherosclerosis
- Bladder Control
- Blood in Urine
- Chest Pain
- Cholecystitis
- Chronic Obstructive Pulmonary Disease (COPD)
- Common Cold
- Constipation
- Cystitis
- Diarrhea
- Edema
- Fever
- Gastroesophageal Reflux Disease (GERD)
- General Care
- Gout
- Headache
- Heart Disease
- Hemolytic Uremic Syndrome (HUS)
- Hiatal Hernia
- High Blood Pressure
- Hot Flashes
- Hydronephrosis
- Hypercalcemia
- Hyperkalemia
- Hyperlipidemia
- Hyperparathyroidism
- Hyponatremia
- Influenza
- Inguinal Hernia
- Kidney Cancer
- Kidney Failure
- Kidney Infection
- Kidney Stones
- Low Blood Pressure
- Low Potassium
- Migraine
- Nausea and Vomiting
- Obesity
- Osteoporosis
- Peptic Ulcer
- Polycystic Kidney Disease (PKD)
- Prescription Refill
- Rhabdomyolysis
- Urethritis
- Urinary Tract Infection (UTI)
- Vitamin D Deficiency
Procedures Performed by Dr. John G. Mellas
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Dr. John G. Mellas as in-network for the following 2026 plans.
Health plans
Medica
Network data as of Aug 13, 2026, as reported by the insurer.
Show all 9 plans from Medica
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Medica with SSM Health Bronze $0 Copay PCP Visits | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Medica with SSM Health Bronze Share | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Medica with SSM Health Expanded Bronze Standard | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Medica with SSM Health Gold $0 Copay PCP Visits | EPO · Gold | Preferred | Accepting new patients |
| Medica with SSM Health Gold Share | EPO · Gold | Preferred | Accepting new patients |
| Medica with SSM Health Gold Standard | EPO · Gold | Preferred | Accepting new patients |
| Medica with SSM Health Silver $0 Copay PCP Visits | EPO · Silver | Preferred | Accepting new patients |
| Medica with SSM Health Silver Share | EPO · Silver | Preferred | Accepting new patients |
| Medica with SSM Health Silver Standard | EPO · Silver | Preferred | Accepting new patients |
Oscar Insurance Company
Network data as of Sep 15, 2026, as reported by the insurer.
Show all 11 plans from Oscar Insurance Company
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Bronze Classic 4700 | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Classic Standard | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Elite + PCP Saver Plus | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Bronze Simple Diabetes | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Gold Classic Standard | EPO · Gold | Preferred | Accepting new patients |
| Gold Simple | EPO · Gold | Preferred | Accepting new patients |
| Silver Classic Standard | EPO · Silver | Preferred | Accepting new patients |
| Silver Elite Saver Plus | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple Diabetes | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple PCP Saver | EPO · Silver | Preferred | Accepting new patients |
| Silver Simple Women's Health with Menopause Benefits | EPO · Silver | Preferred | Accepting new patients |
UnitedHealthcare
Network data as of Sep 15, 2026, as reported by the insurer.
Show all 13 plans from UnitedHealthcare
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| UHC Bronze Copay Focus $0 Indiv Med Ded ($0 Virtual Urgent Care, No Referrals) | EPO · Expanded Bronze | Non Preferred | Accepting new patients |
| UHC Bronze Essential (No Referrals) | EPO · Bronze | Non Preferred | Accepting new patients |
| UHC Bronze Standard (No Referrals) | EPO · Expanded Bronze | Non Preferred | Accepting new patients |
| UHC Bronze Standard+ (Dental + Vision, No Referrals) | EPO · Expanded Bronze | Non Preferred | Accepting new patients |
| UHC Gold Advantage ($0 Virtual Urgent Care, No Referrals) | EPO · Gold | Non Preferred | Accepting new patients |
| UHC Gold Advantage+ ($0 Virtual Urgent Care, Dental + Vision, No Referrals) | EPO · Gold | Non Preferred | Accepting new patients |
| UHC Gold Copay Focus $0 Indiv Med Ded ($0 Virtual Urgent Care, $8 Tier 2 Rx, No Referrals) | EPO · Gold | Non Preferred | Accepting new patients |
| UHC Gold Standard (No Referrals) | EPO · Gold | Non Preferred | Accepting new patients |
| UHC Silver Advantage ($0 Virtual Urgent Care, No Referrals) | EPO · Silver | Non Preferred | Accepting new patients |
| UHC Silver Advantage+ ($0 Virtual Urgent Care, Dental + Vision, No Referrals) | EPO · Silver | Non Preferred | Accepting new patients |
| UHC Silver Copay Focus $0 Indiv Med Ded ($0 Virtual Urgent Care, No Referrals) | EPO · Silver | Non Preferred | Accepting new patients |
| UHC Silver Standard (No Referrals) | EPO · Silver | Non Preferred | Accepting new patients |
| UHC Silver Standard+ (Dental + Vision, No Referrals) | EPO · Silver | Non 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 Dr. John G. Mellas 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
Dr. John G. Mellas is enrolled to bill Medicare as a Practitioner - Nephrology (also registered under: Practitioner - Internal Medicine) .
Bills through: Nephrology And Hypertension Specialists Llc
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.
Payments received
Drug payment
| Mallinckrodt | $315 |
| Questcor Pharmaceuticals | $74 |
| Bard Peripheral Vascular | $70 |
Other
| Food and Beverage | $592 |
Studies
UNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated in 1977Additional Specialities
- Internist
Affiliated hospitals
Questions & Answers
Where can you meet with Dr. John Mellas?
Dr. John Mellas's office is located at 1011 Bowles Avenue Suite 220 in Fenton, MO 63026.
Does Dr. John Mellas accept patients with Medica?
Yes, Dr. John Mellas is listed in-network for Medica through the ACA Marketplace (Obamacare/HealthCare.gov). See the Marketplace plans section for details.
What conditions does Dr. John Mellas treat?
Dr. John Mellas provides treatment for Atherosclerosis, Chest Pain, Cystitis, Inguinal Hernia, Low Potassium, Nausea and Vomiting. For the full list see this list.
Has Dr. John Mellas affiliation with hospitals?
Dr. John Mellas is affiliated with CENTRAL DUPAGE HOSPITAL. For the full list of hospitals see this list.
Does Dr. John Mellas have affiliation with practices?
Dr. John Mellas is affiliated with SSM Health St. Mary's Hospital of St. Louis. For the full list of practices see this list.