ICD-10 coding algorithms for defining comorbidities of acute myocardial infarction

Table 5 Mortality by comorbidities among AMI patients from the BC provincial database (N = 49,861)

Variables	ICD-9 Data In-hospital		ICD-10 Data In-hospital		ICD-9 Data 30-day		ICD-10 Data 30-day		ICD-9 Data 1 Year		ICD-10 Data 1 Year
	N	% of 29610	N	% of 20251	N	% of 29610	N	% of 20251	N	% of 29610	N	% of 20251
Overall	2384	8.1	1386	6.8	2943	9.9	1824	9.0	4899	16.5	3311	16.3
Age
20 – 49	26	0.9	23	1.2	38	1.3	29	1.5	64	2.3	46	2.4
50 – 64	194	2.4	100	1.8	260	3.2	152	2.8	449	5.5	271	4.9
65 – 74	501	6.1	203	4.2	659	8.1	292	6.1	1108	13.6	548	11.4
>=75	1663	15.9	1060	13.1	1986	18.9	1351	16.8	3278	31.3	2446	30.3
Gender
Female	1136	11.6	580	8.3	1343	13.7	754	10.8	2139	21.8	1401	20.1
Male	1248	6.3	806	6.1	1600	8.1	1070	8.1	2760	13.9	1910	14.4
Comorbidities
Shock	394	52.6	173	47.3	407	54.3	178	48.6	438	58.5	194	53.0
Diabetes with Complications	80	15.7	71	13.3	94	18.4	83	15.5	167	32.7	166	31.0
Congestive Heart Failure	1205	19.1	665	16.8	1435	22.7	856	21.6	2378	37.6	1501	37.9
Cancer	91	17.8	70	19.3	109	21.3	103	28.5	230	44.9	202	55.8
Cerebrovascular disease	267	26.0	130	25.5	293	28.5	149	29.2	424	41.3	209	41.0
Pulmonary Edema	50	26.6	25	21.0	56	29.8	33	27.7	81	43.1	53	44.5
Acute Renal Failure	298	47.2	224	31.1	307	48.6	253	35.1	380	60.1	358	49.7
Chronic Renal Failure	167	21.3	122	17.6	184	23.5	167	24.0	310	39.6	308	44.3
Cardiac Dysrhythmias	940	17.0	506	14.5	1057	19.1	596	17.1	1588	28.7	972	27.9

Note: Both ICD-9 and ICD-10 data excluded all patients who were discharged on the same day of admission or the following day

ISSN: 1472-6963