Dr. Mark J. Fesler
- Gender: Male
- Experience: 18 years
- Graduated from: Saint Louis University School Of Medicine
- Graduation year: 2003
- Sole propriator: No
- NPI: 1235204066
Dr. Mark J. Fesler MD
Hematology and Oncology Specialist
He is located at 3655 Vista Avenue in Saint Louis, MO 63110. Can help patients with the following: Arthritis, Cystitis, Hyponatremia, Idiopathic Thrombocytopenic Purpura (ITP), Prescription Refill, Sickle Cell Anemia. His National Provider Identifier (NPI) number is 1235204066. Appointment can be made via the phone number (314) 977-4340. He is affiliated with 1 hospitals.
Conditions treated
Dr. Mark Joseph Fesler, being an hematology and oncology specialist, 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. Mark J. Fesler.
- Abdominal Pain
- Acute Pain
- Anemia
- Arthritis
- Asthma
- Atherosclerosis
- Beta Thalassemia
- Bladder Control
- Bone Cancer
- Cancer
- Chest Pain
- Cholecystitis
- Chronic Obstructive Pulmonary Disease (COPD)
- Common Cold
- Constipation
- Cystitis
- Deep Vein Thrombosis (DVT)
- Diarrhea
- Edema
- Fever
- Gastroesophageal Reflux Disease (GERD)
- General Care
- Headache
- Heart Disease
- Hemophilia
- Hiatal Hernia
- High Blood Pressure
- Hodgkin's Disease
- Hot Flashes
- Hyperlipidemia
- Hyponatremia
- Idiopathic Thrombocytopenic Purpura (ITP)
- Influenza
- Inguinal Hernia
- Leukemia
- Migraine
- Multiple Myeloma
- Nausea and Vomiting
- Neutropenia
- Non-Hodgkin's Lymphoma (NHL)
- Obesity
- Osteoporosis
- Peptic Ulcer
- Pernicious Anemia
- Polycythemia
- Prescription Refill
- Pulmonary Embolism (PE)
- Sickle Cell Anemia
- Thalassemia
- Thrombocytopenia
- Urethritis
- Urinary Tract Infection (UTI)
ACA Marketplace (Obamacare/HealthCare.gov) plan networks
Insurers selling ACA Marketplace (HealthCare.gov) plans list Dr. Mark J. Fesler as in-network for the following 2026 plans.
Health plans
Ambetter Health
Network data as of Sep 15, 2026, as reported by the insurer.
Show all 16 plans from Ambetter Health
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Complete Gold | EPO · Gold | Preferred | Accepting new patients |
| Complete Gold + Vision + Adult Dental | EPO · Gold | Preferred | Accepting new patients |
| Complete Silver | EPO · Silver | Preferred | Accepting new patients |
| Complete Silver + Vision + Adult Dental | EPO · Silver | Preferred | Accepting new patients |
| Elite Bronze | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Elite Bronze + Vision + Adult Dental | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Everyday Bronze | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Everyday Bronze + Vision + Adult Dental | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Everyday Gold | EPO · Gold | Preferred | Accepting new patients |
| Everyday Gold + Vision + Adult Dental | EPO · Gold | Preferred | Accepting new patients |
| Standard Expanded Bronze | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Standard Expanded Bronze + Vision + Adult Dental | EPO · Expanded Bronze | Preferred | Accepting new patients |
| Standard Gold | EPO · Gold | Preferred | Accepting new patients |
| Standard Gold + Vision + Adult Dental | EPO · Gold | Preferred | Accepting new patients |
| Standard Silver | EPO · Silver | Preferred | Accepting new patients |
| Standard Silver + Vision + Adult Dental | EPO · Silver | Preferred | Accepting new patients |
Anthem Blue Cross and Blue Shield
Network data as of Mar 26, 2026, as reported by the insurer.
Show all 10 plans from Anthem Blue Cross and Blue Shield
| Plan | Plan type | Network tier | New patients |
|---|---|---|---|
| Anthem Bronze Pathway 10150 ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Bronze | Participating | Accepting new patients |
| Anthem Bronze Pathway 6900 ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Expanded Bronze | Participating | Accepting new patients |
| Anthem Bronze Pathway 7500 Standard ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Expanded Bronze | Participating | Accepting new patients |
| Anthem Catastrophic Pathway (+ Incentives) | EPO · Catastrophic | Participating | Accepting new patients |
| Anthem Gold Pathway 2000 Standard ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Gold | Participating | Accepting new patients |
| Anthem Heart Healthy Bronze Pathway 4900 ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Expanded Bronze | Participating | Accepting new patients |
| Anthem Heart Healthy Silver Pathway 3100 ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Silver | Participating | Accepting new patients |
| Anthem Silver Pathway 5350 ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Silver | Participating | Accepting new patients |
| Anthem Silver Pathway 6000 Standard ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Silver | Participating | Accepting new patients |
| Anthem Silver Pathway 7200 ($0 Virtual PCP + $0 Select Drugs + Incentives) | EPO · Silver | Participating | Accepting new patients |
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 |
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. Mark J. Fesler 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. Mark J. Fesler is enrolled to bill Medicare as a Practitioner - Hematology/oncology (also registered under: Practitioner - Internal Medicine, Practitioner - Hematopoietic Cell Transplantation And Cellular Therapy) .
Bills through: Slh Physicians 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
| Genzyme | $21961 |
| Seattle Genetics | $3942 |
| Millennium Pharmaceuticals | $3563 |
Other
| Promotional Speaking or Service | $24222 |
| Consulting | $8610 |
| Travel and Lodging | $2914 |
| Other | $2500 |
| Food and Beverage | $1681 |
Studies
SAINT LOUIS UNIVERSITY SCHOOL OF MEDICINE
Graduated in 2003Additional Specialities
- Internist
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Questions & Answers
Has Dr. Mark Joseph Fesler affiliation with hospitals?
Dr. Mark Joseph Fesler is affiliated with ST LOUIS UNIVERSITY HOSPITAL.
Does Dr. Mark Joseph Fesler accept insurance?
Dr. Mark Joseph Fesler is listed in-network for 46 ACA Marketplace (Obamacare/HealthCare.gov) plans from Ambetter Health, Anthem Blue Cross and Blue Shield, Medica, Oscar Insurance Company. See the Marketplace plans section for details.
Where can you meet with Dr. Mark Joseph Fesler?
Dr. Mark Joseph Fesler's office is located at 3655 Vista Avenue in Saint Louis, MO 63110.
What conditions does Dr. Mark Joseph Fesler treat?
Dr. Mark Joseph Fesler provides treatment for Arthritis, Cystitis, Hyponatremia, Idiopathic Thrombocytopenic Purpura (ITP), Prescription Refill, Sickle Cell Anemia. For the full list see this list.