Table 1.
Underlying causes of death and associated international classification of disease (ICD)-9 (1980 to 1998) and ICD-10 (1999–2010) codes
| Category | ICD-9 code | ICD-10 code |
|---|---|---|
| All causes | 000+ | A00+ |
| Non-traumatic | 001–799 | A00–R99 |
| Select non-traumatic causes | ||
| Diabetes | 250 | E08–E13 |
| Circulatory | 390–459 | I00–I99, G45, G46 |
| Cardiovascular | 393–429 | I05–I52 |
| Ischemic | 410–414 | I20–I25 |
| Cerebrovascular | 430–438 | I67 |
| Respiratory | 460–519 | J00–J99 |
| Nephritis and nephrotic syndromes | 580–589 | N17–N19 |
| Acute renal failure | 584 | N17 |
| Mental disorders | 290–316 | F01–F69 |
| Select traumatic causes | ||
| Natural heat exposure and dehydrationa | E900.0 or E900.9 and 992 | X30 and T67 |
| Accidentb | 2 | 2 |
| Suicideb | 3 | 3 |
| Homicideb | 4 | 4 |
a
While mortality attributed to natural heat-related exposure is classified as a traumatic external injury, we have included the non-traumatic dehydration code ICD-9 276.51/ICD-10 E86.0 with this subgrouping. We included dehydration in this group to ensure we captured cases potentially misclassified, given the limited use and possible recognition of existing heat-related exposure ICD-9 and ICD-10 codes
b
The Washington State Department of Health codes the variable “Inj_caus” as the type of external injury indicated by the underlying cause of death: accident=2; suicide=3; and homicide=4