Code (Key) for Category of Disease or Injury

Code	Disease or Injury
A	Infectious and Parasitic Diseases
B	Neoplasms
C	Endocrine, Nutritional, Metabolic Diseases; Immunity Disorders
D	Blood and Blood-forming Organs
E	Mental Disorders
F	Nervous System, Sense Organs
G	Circulatory System
H	Respiratory System
J	Digestive System
K	Genitourinary System
L	Pregnancy, Childbirth and Puerperium
M	Skin and Subcutaneous Tissue
N	Musculoskeletal System and Connective Tissue
P	Congenital Anomalies
S	Injury
X	Other