NOTE : Deaths are classified using the International Classification of Diseases , Tenth Revision ( ICD-10 ). Drug overdose deaths are identified using underlying cause of death codes X40-X44 , X60-X64 , X85 , and Y10-Y14 . The following multiple cause of death codes were used to identify specific drug types : T40.2 for natural and semi-synthetic opioid analgesics , T40.3 for methadone , T40.4 for synthetic opioid analgesics excluding methadone , T40.1 for heroin , and T40.0 , T40.1 , T40.2 , T40.3 , T40.4 or T40.6 for any opioid , and T40.2 , T40.3 for prescription opioids . Approximately one-fifth of drug poisoning deaths lack information on the specific drugs involved . Some of these deaths may involve opioid analgesics or heroin . Age-adjusted death rates were calculated using the direct method and the 2000 standard population .
SOURCE : CDC / NCHS , National Vital Statistics System , Mortality .
Source : US Centers for Disease Control and Prevention ( CDC ). Available at https :// www . cdc . gov / drugoverdose / foa / state-opioid-mm . html ; https :// public . tableau . com / RelatedOutcomesSurveillanceandTrackingSystem / FMECCountyAnnual ?% 3Aembed = y &% 3A % 20display _ count = no &% 3AshowVizHome = no