Subclass R: General medicine
Subclass RA: Public aspects of medicine
Pathology is the study and diagnosis of disease.
Subclass RC: Internal medicine
Surgery is the medical specialty that involves physical intervention on tissues; often either cutting into them or closing an existing wound.
Subclass RE: Ophthalmology
Subclass RF: Otorhinolaryngology
Otorhinolaryngology is the medical specialty dealing with the head and neck, otherwise known as "ear, nose and throat".
Subclass RG: Gynecology and obstetrics
Pediatrics is the medical specialty that covers the prevention, diagnosis, and treatment of diseases in children.
Dentistry is the medical specialty dealing with teeth.
Dermatology is the medical specialty dealing with skin.
Subclass RM: Therapeutics
Therapeutics covers all remedies of health problems apart from pharmaceutical. This ranges from diet, to acupuncture, to physical therapy, to chemotherapy.
Subclass RMA: Pharmacology
Pharmacology is the branch of medicine and biology concerned with the study of drugs.
Subclass RS: Pharmacy and materia medica
Pharmacy and materia medica covers medical substances and their therapeutic properties. This includes formulation, pharmacopoeias, and dispensaries.
Nursing is a profession focused on care for people, with the aim of improving or maintaining their health.
Subclass RV: Botanic, Thomsonian and eclectic medicine
Homeopathy is a system of alternative medicine based on the doctrine that like cures like, according to which a substance that causes the symptoms of a disease in healthy people will cure similar symptoms in sick people.
Subclass RZ: Other systems of medicine
Other systems of medicine covers subjects such as ayurveda, total chinese medicine (TCM), chiropractic, osteopathy, magnetotherapy, phrenology and radiesthesia.