Margaret B. Fischer, MD| Adult Congenital Cardiac Disease, Electrophysiology | MedStar Health

Margaret B. Fischer, MD
Provider is directly employed by MedStar Health

4.9 out of 5 (533 reviews)

Specialities: Adult Congenital Cardiac Disease, Electrophysiology

Languages: English

(703) 208-7259

About me

Margaret "Marty" Bell Fischer, MD, is board certified in internal medicine and pediatric cardiology and is Director of the Congenital and Structural Arrhythmia Program at MedStar Washington Hospital Center. She specializes in adult and pediatric cardiac electrophysiology with a specialized focus on adult congenital heart disease and patients with inherited rhythm disturbances.

Dr. Fischer received her medical degree from the University of Toledo. She then completed her residency program at St. Louis University/Cardinal Glennon Children's Hospital, a fellowship at Texas Children's Hospital/Texas Heart Institute and a fellowship at the Cleveland Clinic. She had visiting fellowships at the Royal Brompton Hospital in London and Rainbow Babies Children's Hospital in Cleveland, Ohio.

Her clinical interests include adult congenital heart disease, cardiac anomalies in previous surgeries, and inherited arrhythmia disorders. Her research interests include multi-center trials for new catheter techniques, using different types of catheters, and improving the technology of implant devices.

Dr. Fischer is an advocate for the recognition of an underserved population of adults with congenital heart disease. Congenital heart disease is severely under-identified in adults. With knowledge of previously diagnosed conditions and past surgeries, Dr. Fischer's skill set allows her to properly care for adults with congenital heart disease. She is also an advocate for the improvement of the use of remote heart monitoring devices. Dr. Fischer hopes to provide more patients with the advantages of remote monitoring through education for both patients and referring physicians.

After a few years of caring for patients in remote communities in Pennsylvania, Dr. Fischer grew passionate about community outreach and education. She realized that a large population of the rural United States is not receiving adequate care. Her goal is to generate community outreach opportunities, in order to ensure that both patients, as well as referring physicians, know what options can be available to them. In her free time, Dr. Fischer dedicates herself to her passion of dressage.

"I am my patient's best advocate. My aim is to generate a collaborative effort with my patients in order to get them involved in the decisions we make about their treatment. Through building a strong relationship with my patients, I hope to gain their trust and become a person that they feel comfortable opening up to, without fear of judgment or ridicule.

It is important to me to educate patients thoroughly, or as much as possible, and to be accessible when needed. When I'm with a patient, this individual is the focus of all of my attention. My goal is to improve quality of life as well as my patient's longevity."

Clinical areas of focus

  • Atrial Fibrillation
  • Cardiac Ablation
  • Cardiac Arrhythmias
  • Heart Racing
  • Implantable Defibrillator
  • Pacemaker
  • Palpitations
  • Supraventricular Tachycardia
  • Tachycardia
  • Watchman Device Implantation
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Conditions and procedures

Conditions I treat

  • Abnormal Electrocardiogram (EKG)
  • Abnormal Stress Test
  • Acute Bacterial Endocarditis
  • Adult Congenital Heart Disease
  • Adult Congenital Heart Disease In Pregnancy
  • Alagille Syndrome
  • Alcoholic Cardiomyopathy
  • Amyloidosis
  • Anomalies Of Pulmonary Circulation
  • Anomalies Of The Aorta
  • Anomalies Of The Coronary Artery
  • Anomalous Atrioventricular Excitation
  • Anomalous Coronary Artery (ACA)
  • Anomalous Pulmonary Venous Drainage
  • Aortic Coarctation
  • Aortic Diseases
  • Aortic Regurgitation
  • Aortic Stenosis
  • Aortic Valve Disease
  • Aorto Left Ventricular Fistula
  • Arrhythmias During Pregnancy
  • Arrhythmias In Adults With Congenital Heart Diseases
  • Atherosclerosis
  • Atherosclerosis Of The Aorta
  • Athletic Heart Syndrome
  • Atrial Fibrillation
  • Atrial Flutter
  • Atrial Septal Defect (ASD)
  • Atrial Tachycardia
  • Atrioventricular Block
  • Atrioventricular Canal Defects
  • Atrioventricular Nodal Reentrant Tachycardia
  • Atrioventricular Reentrant Tachycardia
  • Autoimmune Pericarditis
  • Barth Syndrome
  • Bicuspid Aortic Valve
  • Bradycardia
  • Brugada Syndrome
  • Cardiac Angina
  • Cardiac Arrhythmias
  • Cardiac Channelopathies
  • Cardiac Conduction Defects
  • Cardiac Device Infection
  • Cardiac Device Malfunction
  • Cardiac Sarcoidosis
  • Cardiac Tumor
  • Cardio Oncology
  • Cardiomegaly
  • Cardiomyopathy
  • Cardiorenal Syndrome
  • Carotid Intimal Thickness
  • Catecholaminergic Polymorphic Ventricular Tachycardia
  • Chest Pain
  • Cholesterol Disorders
  • Common Aortopulmonary Trunk
  • Complete Atrioventricular Block
  • Complex Arrhythmia
  • Conduction Defects
  • Congenital Anomalies Of The Great Veins
  • Congenital Aortic Valve Disease
  • Congenital Atresia Of The Pulmonary Valve
  • Congenital Cyanotic Heart Disease
  • Congenital Heart Block
  • Congenital Heart Disease
  • Congenital Infundibular Stenosis
  • Congenital Insufficiency Of The Aortic Valve
  • Congenital Mitral Valve Disease
  • Congenital Mitral Valve Regurgitation
  • Congenital Stenosis Of The Aortic Valve
  • Congenital Stenosis Of The Mitral Valve
  • Congenital Stenosis Of The Pulmonary Valve
  • Congenital Subaortic Stenosis
  • Congenital Tricuspid Stenosis
  • Congenitally Corrected Transposition Of The Great Arteries
  • Congestive Heart Failure (CHF)
  • Cor Biloculare
  • Cor Triatriatum
  • Coronary Artery Fistula
  • Cyanotic Heart Disease
  • Dextrocardia
  • Dilated Cardiomyopathy
  • Double Aortic Arch
  • Double Outlet Right Ventricle (DORV)
  • Double Outlet Ventricle
  • Ebstein's Anomaly
  • Edema
  • Eisenmenger Syndrome
  • Endocardial Cushion Defect
  • Exercise Intolerance
  • Familial Arrhythmias
  • Familial Dilated Cardiomyopathy
  • Family History Of Sudden Cardiac Death
  • First Degree Heart Block
  • Fontan Procedure Survivor
  • Genetic Cardiomyopathy
  • Giant Cell Myocarditis
  • Heart Murmur
  • Heart Problems
  • Heart Racing
  • Heterotaxy Syndromes
  • Hypertension
  • Hypertrophic Cardiomyopathy
  • Hypoplastic Left Heart Syndrome
  • Idiopathic Hypertrophic Subaortic Stenosis
  • Infiltrative Disorders Of The Heart
  • Infundibular Right Ventricular Outflow Obstruction
  • Ischemic Cardiomyopathy
  • Lead Malfunction
  • Left Bundle Branch Block
  • Long Qt Syndrome
  • Lown Ganong Levine Syndrome
  • Marfan Syndrome
  • Mild Pulmonic Stenosis
  • Mitral Atresia
  • Mitral Regurgitation
  • Mitral Valve Disease
  • Mitral Valve Prolapse
  • Mitral Valve Regurgitation
  • Mitral Valve Stenosis
  • Myocardial Infarction (MI)
  • Myocarditis
  • Myxoma
  • Obstructive Anomalies Of The Heart
  • Orthopnea
  • Orthostatic Hypotension
  • Ostium Primum Atrial Septal Defect (ASD)
  • Overriding Aorta
  • Pacemaker Infection
  • Pacemaker Malfunction
  • Palpitations
  • Paroxysmal Supraventricular Tachycardia
  • Paroxysmal Tachycardia
  • Paroxysmal Ventricular Tachycardia
  • Partial Anomalous Pulmonary Venous Return (PAPVR)
  • Patent Ductus Arteriosus
  • Patent Foramen Ovale
  • Pericardial Effusion
  • Pericarditis
  • Persistent Ostium Primum
  • Polymorphic Ventricular Tachycardia
  • Postural Tachycardia Syndrome
  • Pre Excitation Syndrome
  • Premature Atrial Contraction
  • Premature Beats
  • Premature Ventricular Contractions
  • Presyncope
  • Pulmonary Arteriovenous Malformation (AVM)
  • Pulmonary Artery Coarctation And Atresia
  • Pulmonary Artery Stenosis
  • Pulmonary Edema
  • Pulmonary Valve Disorders
  • Pulmonary Valve Insufficiency
  • Pulmonary Valve Stenosis
  • Pulmonary Vascular Obstructive Diseases
  • Pulmonic Valve Stenosis
  • Refractory Angina
  • Restrictive Cardiomyopathy
  • Rheumatic Aortic Regurgitation
  • Rheumatic Aortic Stenosis
  • Rheumatic Diseases Of Pulmonary Valve
  • Rheumatic Fever
  • Rheumatic Heart Disease
  • Rheumatic Heart Failure
  • Rheumatic Mitral Regurgitation
  • Rheumatic Mitral Stenosis
  • Right Bundle Branch Block
  • Right Heart Failure
  • Right Ventricular Dysplasia
  • Right Ventricular Hypertrophy
  • Secondary Hypertension
  • Shone's Syndrome
  • Short Qt Syndrome
  • Sick Sinus Syndrome
  • Single Ventricle Defect
  • Sinoatrial Node Dysfunction
  • Sinus Node Dysfunction
  • Sinus Of Valsalva Fistula/Aneurysm
  • Sinus Venosus Atrial Septal Defect (ASD)
  • Subaortic Stenosis
  • Subvalvar Aortic Stenosis
  • Supravalvar Aortic Stenosis
  • Supraventricular Tachycardia
  • Syncope
  • Tachycardia
  • Tachycardia Bradycardia Syndrome
  • Tetralogy Of Fallot (TOF)
  • Transposition Of Great Vessels
  • Transposition Of The Great Arteries (TGA)
  • Tricuspid Atresia
  • Tricuspid Atresia And Truncus Arteriosus
  • Tricuspid Regurgitation
  • Tricuspid Stenosis
  • Tricuspid Valve Disease
  • Trifascicular Block
  • Trucus Arteriosus
  • Type 1 Second Degree Heart Block
  • Type 2 Second Degree Heart Block
  • Unstable Angina
  • Valve Stenosis
  • Valvular Endocarditis
  • Vascular Ring
  • Vasovagal Syncope
  • Ventricular Arrhythmia
  • Ventricular Fibrillation
  • Ventricular Septal Defects
  • Ventricular Tachycardia
  • Viral Cardiomyopathy
  • Wolff-Parkinson-White Syndrome
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Procedures I perform

  • 4D Flow Mri
  • Ablation Arrhythmogenic Focus
  • Ablation Av Node
  • Ablation For Supraventricular Tachycardia
  • Ablation For Ventricular Tachycardia
  • Adenosine Stress Test
  • Advanced Lipid Blood Tests
  • Aortic Angioplasty
  • Atrial Fibrillation Ablation
  • Atrial Fibrillation Cryoablation
  • Atrial Fibrillation Radiofrequency Ablation
  • Cardiac Ablation
  • Cardiac Contractility Modulation (CCM)
  • Cardiac Device Implant
  • Cardiac Devices
  • Cardiac Implantable Device Replacement
  • Cardiac Mapping
  • Cardiac Rehabilitation
  • Cardiac Risk Assessment
  • Cardiopulmonary Exercise Testing
  • Cardiovascular Care
  • Cardioversion
  • Cholesterol Management
  • Collateral Vessel Closure
  • Convergent Procedure
  • Defibrillator Malfunction
  • Directional Atherectomy
  • Dobutamine Stress Test
  • Heart Health
  • Holter Monitor
  • Implantable Cardiac Monitor Procedure
  • Implantable Defibrillator
  • In Office Cardiac Echocardiogram
  • In Office Cardiac Stress Test
  • Intracardiac Catheter Ablation
  • Intravenous Lead Extraction
  • Lariat Procedure
  • Laser Lead Extraction
  • Lead Extraction
  • Left Atrial Appendage Closure
  • Loop Recorder
  • Pacemaker
  • Pacemaker And Icd Interrogation
  • Pacemaker Placement
  • Preoperative Evaluation
  • Preventative Cardiology
  • Pulmonary And Cardiac Rehabilitation
  • Pulmonary Vein Isolation
  • Radiofrequency Rhizotomy
  • Remote Cardiac Device Monitoring
  • Replacement Of Defibrillator
  • Resynchronization Therapy
  • Rotational Atherectomy
  • Stress Echo Cardiogram
  • Tilt Table Test
  • Transesophageal Echocardiography
  • Transthoracic Echocardiogram
  • Transvenous Lead Extraction
  • Watchman Device Implantation
  • Wearable Defibrillator
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Practice locations

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1733 Howell Road
Hagerstown, MD, 21740


Fax 703-208-7259

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miles away

Fax 703-208-7259

163 Thomas Johnson Drive
Frederick, MD, 21702


Fax 301-662-7103

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miles away

Fax 301-662-7103

3020 Hamaker Court
Suite 502
Fairfax, VA, 22031


Fax 703-208-7259

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miles away

Fax 703-208-7259

163 Thomas Johnson Drive
Suite E
Frederick, MD, 21702


Fax 703-208-7259

Get Directions

miles away

Fax 703-208-7259


MedStar Medical Group accepts most major health insurance plans. If you are uncertain as to whether your individual health insurance plan is accepted at MedStar Medical Group, please call your insurance company.

  • List of insurance plans we accept
    • Aetna Elect Choice/ EPO (Aetna Health Fund) Innovation Health: Network Only Plus
    • Aetna Quality Point of Service (POS)
    • Aetna USAccess (POS)
    • Aetna Student Health Insurance
    • Aetna Medicare Advantage HMO & PPO Plans
    • CFBCBS BlueChoice HMO
    • CFBCBS Blue Choice Opt Out Plus Open Access (POS)
    • CFBCBS Maryland Point of Service Plan (MPOS)
    • CFBCBS Federal Employee Program (Std. & Basic PPO)
    • CFBCBS Maryland Indemnity or PPO
    • CFBCBS (NCA) Indemnity
    • CIGNA HMO & Network (HMO)
    • CIGNA POS/Network POS
    • Great-West Healthcare POS/CIGNA
    • CIGNA Indemnity
    • Coventry Health Care of Virginia
    • Coventry of Delaware HMO/PPO
    • First Health PPO
    • Tricare Prime
    • Tricare Standard
    • Tricare Extra (Indemnity)
    • Tricare for Life (Medicare Supplemental Plan)
    • MedStar Family Choice - Maryland Health Choice
    • MedStar Select (MedStar Associates' Plan)
    • MedStar Medicare Choice
    • United Healthcare Select HMO - EPO/NPP
    • United Healthcare Select Plus (POS)
    • United Healthcare Choice Plus
    • United Student Resources
    • M.D. IPA (HMO)
    • M.D. IPA Preferred (POS)
    • Optimum Choice Preferred (POS) & OCI Direct (HMO)
    • Mamsi Life & Health (Indem./PPO)
    • Aetna Worker's Compensation Network
    • Coventry Health Care National Network PPO
    • Private Health Care Systems (PHCS) (PPO)
    • United Healthcare Options (PPO) (includes Empire PPO, GEHA, Compass Rose)
    • OneNet PPO, Inc.
    • United Healthcare Choice
    • United Healthcare Core Essential (HMO)
    • Optimum Choice
    • United Healthcare Navigate
    • United Healthcare Compass (HMO)
    • CIGNA HMO Open Access (OA)
    • Network OA
    • POS OA & OA Plus
    • PPO and PPO Plus
    • Choice Fund PPO
    • CFBSBC Blue Preferred PPO
    • HealthyBlue PPO
    • CFBCBS Blue Choice Opt Out Open Access
    • BlueChoice Open Access
    • Blue Choice Advantage & Healthy Blue (HMO, POS)
    • Aetna Traditional Choice (PPO)
    • Innovation Health: Indemnity
    • Aetna Open Choice (PPO)
    • Innovation Health: PPO
    • Aetna Managed Choice (POS)
    • Innovation Health: POS Plus
    • Aetna Elect Choice/ Open Access (POS)
    • Innovation Health: Open Network Only Plus
    • Aetna HMO-Open Access/Select OA/HealthFund/Health Network Option OA
    • Innovation Health: POS
    • Open HMO
    • Opoen HMO Option
    • Open EPO Plus
    • Aetna Managed Choice Open Access (POS)
    • Choice POS & Choice POS II
    • Innovation Health: Open POS Plus
    • Open POS II
    • Aetna HMO
    • Select HMO/HealthFund/Health Network
    • Aetna Innovations: HMO & EPO Plus


Board Certification: American Board of Internal Medicine, Internal Medicine

Board Certification: American Board of Pediatrics, Pediatric Cardiology

Fellowship Program: Cleveland Clinic (1995)

Fellowship Program: Rainbow Babies & Children's Hospital (1995)

Fellowship Program: Texas Children's Hospital (1993)

Fellowship Program: Brompton Hospital (1993)

Residency Program: St. Louis University Medical Center (1990)

Medical School: University of Toledo (1986)

Ratings and reviews

  • Provider explained things understandably

  • Provider listened carefully

  • Provider knew medical history

  • Provider showed respect

  • Provider spent enough time with patient

  • Jun 24, 2022


  • Apr 29, 2022


  • Mar 11, 2022

    Listened and answered questions