. Author manuscript; available in PMC: 2018 Aug 1.

Published in final edited form as: J Diabetes Complications. 2017 May 5;31(8):1332–1339. doi: 10.1016/j.jdiacomp.2017.04.021

Table 2. Most common reasons for readmission in training and validation samples based on primary ICD-9-CM code.

ICD-9-CM Code	Description	Training sample n (% of readmissions)	Validation sample n (% of readmissions)
428.xx	Heart failure	262 (26.9)	180 (28.1)
250.xx	Diabetes mellitus	69 (7.1)	35 (5.5)
414.xx	Chronic ischemic heart disease	45 (4.6)	22 (3.4)
786.0x or 786.5x	Chest pain or shortness of breath	41 (4.2)	31 (4.8)
440.xx	Peripheral arterial disease	38 (3.9)	27 (4.2)
584.xx	Acute kidney failure	37 (3.8)	24 (3.7)