Category	Description	ICD-10 Chapter	ICD-10 Code Range
cancer	Any type of cancer or malignant neoplasm.	II	C00-D49
nervous	Any disease of the brain, spine, or nerves.	VI	G00-G99
cardiovascular	Any disease of the heart or vascular system. Does not include hematological diseases.	IX	I00-I99
musculoskeletal and rheumatic	Any disease of the muscles, skeletal system, joints, and connective tissues.	XIII	M00-M99
digestive	Any disease of the gastrointestinal tract and digestive organs, including the liver and pancreas.	XI	K00-K95
obstetrical and gynecological	Any disease relating to pregnancy, childbirth, the female reproductive system, or the breasts.	XIV; XV	O00-O9A; N60-N98
infectious	Any disease causes by infectious microorganisms.	I	A00-B99
respiratory	Any disease of the lungs and respiratory tract.	X	J00-J99
hematologic	Any disease of the blood, bone marrow, lymph nodes, or spleen.	III	D50-D89
kidney and urologic	Any disease of the kidneys or bladder, including the ureters, as well as the male reproductive organs, including the prostate.	XIV	N00-N53; N99
endocrine	Any disease of the endocrine glands, as well as metabolic disorders.	IV	E00-E89
oral and maxillofacial	Any condition involving the mouth, jaws, head, face, or neck.	XI; XIII	K00-K14; M26-M27
eye	Any condition involving the eyes, including blindness.	VII	H00-H59
otorhinolaryngologic	Any condition of the ear, nose, and/or throat.	VIII	H60-H95; J30-J39
skin	Any disease of the skin.	XII	L00-L99
rare	A special category reserved for reports of rare diseases, defined as those impacting fewer than 200,000 individuals in the United States (see https://rarediseases.info.nih.gov/diseases)	NA	NA