Drug overdose in the ED: a record linkage study examining emergency department ICD-10 coding practices in a cohort of people who inject drugs

Table 2 Distribution of the 228 T-codes assigned during study period, in order of frequency (highest ranked only^a)

T36-T50, Poisoning due to:		No. of cases	% of T codes	% of F&T codes
T36-T50, Poisoning due to:		n	N = 228	N = 449
T50.9	Other and unspecified drugs, medicaments and biological substances^b	77	33.8	17.1
T40.1	Heroin	37	16.2	8.2
T42.4	Benzodiazepines	33	14.5	7.3
T40.6	Other and unspecified narcotics	16	7.0	3.6
T39.1	4-Aminophenol derivatives	11	4.8	2.4
T43.9	Psychotropic drug, unspecified	11	4.8	2.4
T42.7	Antiepileptic and sedative-hypnotic drugs, unspecified	10	4.4	2.2
T40.2	Other opioids	9	4.0	2.0
T40.3	Methadone	6	2.6	1.3
T43.6	Psychostimulants with abuse potential	4	1.8	0.9
T40.0	Opium	3	1.3	0.7
T40.7	Cannabis (derivatives)	3	1.3	0.7
T41.2	Other and unspecified general anaesthetics	3	1.3	0.7
T40.4	Other synthetic narcotics	2	0.9	0.4
T43.0	Tricyclic and tetracyclic antidepressants	2	0.9	0.4
T40.9	Other and unspecified psychodysleptics [hallucinogens]	1	0.4	0.2

^aIn cases with multiple T codes per encounter (n = 4), the highest ranked diagnosis was taken
^bDiagnosis does not specify drug class

ISSN: 1472-6963