Allergy & Immunology: Study, diagnosis and treatment of unusual sensitivity to certain substances, and of the structure and functions of the immune system.

Cardiac Electrophysiology: Study, diagnosis and treatment of the electrical functioning of the heart.

Cardiovascular Disease: Study, diagnosis and treatment of ailments of the heart, blood vessels, lungs, arteries and veins.

Child Neurology: Study, diagnosis and treatment of diseases and disorders of children’s nervous systems.

Clinical Genetics: Study of how genetic factors impact diseases and ailments, and the diagnosis and treatment of those diseases and ailments.

Colon & Rectal Surgery: Treatment of diseases of the colon and rectum through repair or removal of organs or tissues.

Dermatology: Study, diagnosis and treatment of diseases and disorders of the skin.

Diagnostic Radiology: Use of x-rays and other imaging methods—CT scans, ultrasound, MRI—to diagnose disease.

Endocrinology, Diabetes & Metabolism: Study of glands and the hormones they produce and their roles in disease, along with the diagnosis and treatment of such diseases. Metabolism involves the chemical processes taking place within the body; diabetes is a metabolic disorder.

Family Medicine: Health care for individuals of any age or sex within a family unit.

Gastroenterology: Study, diagnosis and treatment of illnesses of the gastrointestinal tract, including the stomach and intestines.

Geriatric Medicine: Study, diagnosis and treatment of diseases and disorders in later life, and the promotion of good health among the elderly.

Geriatric Psychiatry: Study, diagnosis and treatment of mental, behavioral and emotional disorders in the elderly.

Gynecologic Oncology: Study, diagnosis and treatment of cancer in the reproductive organs of women.

Hand Surgery: Treatment of disorders of the hand through mechanical intervention.

Hematology: Study, diagnosis and treatment of diseases of blood and the organs that produce it.

Infectious Disease: Study, diagnosis and treatment of sicknesses caused by disease-­producing organisms that can be spread from person to person.

Internal Medicine: Study and diagnosis of illnesses affecting the internal organs, and their treatment without the use of surgery.

Maternal & Fetal Medicine: Study and treatment of pregnant women and the growth and development of their fetuses.

Medical Oncology: Treatment of cancers with medicine, including chemotherapy.

Neonatal-Perinatal Medicine: Study, diagnosis and treatment of disorders in fetuses during the five months before birth, and of babies at birth and in the period immediately after birth.

Nephrology: Study, diagnosis and treatment of kidney disorders and diseases.

Neurological Surgery: Treatment of disorders of the nervous system through mechanical repair procedures.

Neurology: Study, diagnosis and treatment of disorders of the nervous system.

Neuroradiology: Use of x-rays to treat disorders of the head, neck and spine.

Nuclear Medicine: Use of radioactive materials to diagnose and treat disease.

Obstetrics & Gynecology: Treatment of women during pregnancy, labor and birth, and the treatment of diseases and disorders of their reproductive systems.

Ophthalmology: Study, diagnosis and treatment of functions, diseases and disorders of the eye.

Orthopedic Surgery: Treatment of disorders of the skeleton, its related muscles, and the attendant joints and ligaments, through mechanical repairs.

Otolaryngology: Study, diagnosis and treatment of disorders of the ear, nose and throat, including the vocal cords.

Pathology: Study of disease, including its nature and causes and the abnormal conditions it causes.

Pediatric Cardiology: Study, diagnosis and treatment of heart diseases and disorders in children.

Pediatric Pulmonology: Study, diagnosis and treatment of respiratory diseases and disorders in children.

Pediatrics: Study of health in infants and children, and the diagnosis and treatment of illness in them.

Physical Medicine & Rehabilitation: Treatment of conditions that affect a patient’s ability to function and perform, and the attempt to minimize the effects of illness or disability on a patient’s daily life through motivation, training and support.

Plastic Surgery: Repair or improvement of body parts through mechanical means, especially through the transfer of tissue.

Psychiatry: Study, diagnosis and treatment of mental, behavioral and emotional disorders.

Pulmonary Disease: Study, diagnosis and treatment of illnesses involving the lungs.

Radiation Oncology: Use of high-energy rays to destroy and/or prohibit growth in cancerous tumors.

Reproductive Endocrinology: Study, diagnosis and treatment of fertility problems and menstrual disorders.

Rheumatology: Study, diagnosis and treatment of diseases and disorders of the muscles, joints and tendons.

Surgery: Repair or removal of organs or tissues via mechanical means.

Thoracic Surgery: Treatment of ailments and disorders of the heart and lungs through mechanical means.

Urology: Study, diagnosis and treatment of diseases and disorders of the urinary tract in women and the urinary tract and reproductive system in men.

Vascular and Interventional Radiology: Use of imaging techniques to guide and monitor treatments, such as balloon angioplasty, needle biopsy, and access via veins to inject or drain fluids from the blood.

Vascular Surgery: Repair of veins and/or arteries through mechanical means.