Hand surgeons are orthopedic surgeons (medical doctors who specialize in bone, muscle, and joint surgery) or plastic surgeons

Hematologists are medical doctors who specialize in the diagnosis and treatment of diseases of the blood and blood system

Hepatologists are gastroenterology doctors who further specialize in the diagnosis and treatment of diseases of the liver

Hospice and palliative medicine specialists are medical doctors who help prevent and relieve suffering of patients

Hospitalists are medical doctors who specialize in hospital care, providing treatment in place of a primary care physician.

Hyperbaric physicians are medical doctors who specialize in hyperbaric medicine

Infectious disease specialists are medical doctors who specialize in the diagnosis and treatment of complex infections

An internist is a medical doctor who specializes in the care of adults. People might choose an internist as their primary doctor

Interventional cardiologists are medical doctors who specialize in performing surgical or invasive procedures

A medical examiner is a public official who investigates deaths defined by law as being important to the public health and welfare

Medical geneticists are medical doctors who specialize in the diagnosis and treatment of genetic disorders

A neonatologist is a pediatric medical doctor who specializes in the diagnosis and treatment of disorders in newborns.

Nephrologists are medical doctors who specialize in the diagnosis and treatment of diseases of the kidney and urinary system, such as inflammation of the kidneys, chronic kidney disease, or cancer.

Neurological surgeons are medical doctors who specialize in surgery of the brain, spinal column, and nervous system.

Neurologists are medical doctors who specialize in the diagnosis and treatment of brain, spinal cord, and nervous system diseases, such as multiple sclerosis,

Nuclear medicine specialists are medical doctors who use radioactive medicines for diagnosis and treatment of certain problems.

Obstetricians (also called OBs) are medical doctors who specialize in the care of pregnant women, from the time of conception through delivery

Occupational medicine specialists are medical doctors who specialize in helping organizations maintain a safe and healthy workplace and provide care for injured workers and assist them in getting back to work.

Medical oncologists are medical doctors who specialize in the diagnosis and treatment of cancer.

Ophthalmologists are medical doctors who specialize in the diagnosis and treatment of eye problems, diseases, and injuries.