Table 1.

Mapping of category value to diagnosis definition.

Category	Definition
1	Infectious and Parasitic Diseases
2	Neoplasms
3	Endocrine, Nutritional, and Metabolic Diseases and Immunity Disorders
4	Diseases of the Blood and Blood-Forming Organs
5	Mental Illness
6	Diseases of the Nervous System and Sense Organs
7	Diseases of the Circulatory System
8	Diseases of the Respiratory System
9	Diseases of the Digestive System
10	Diseases of the Genitourinary System
11a	Complications of Pregnancy; Childbirth; and the Puerperium
12	Diseases of the Skin and Subcutaneous Tissue
13	Diseases of the Musculoskeletal System and Connective Tissue 14
14a	Congenital Anomalies
15a	Certain Conditions Originating in the Perinatal Period
16	Injury and Poisoning
17	Symptoms and Ill-Defined Conditions Influencing Health Status
18	Residual Codes (Unclassified)

^aDoes not appear within the filtered data sample.