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Table 3 ICD-9-CM codes used for identifying comorbidities

From: Pulmonary arterial hypertension associated with interferon therapy: a population-based study

Comorbidity ICD-9-CM
Connective tissue disorder 446, 701.0, 710.0, 710.1, 710.2, 710.3, 710.4, 710.8, 710.9, 711.2, 714, 719.3, 720, 725, 728.5, 728.89, 729.30
Other liver disease 070.22, 070.23, 070.32, 070.33, 070.6, 070.9, 456.0, 456.1, 456.2, 570, 571, 572.2, 572.3, 572.4, 572.8, 573.3, 573.4, 573.8, 573.9, V42.7
HIV/AIDS 042, 043, 044
Obesity 278.0
Hypertension 401, 402, 403, 404, 405
Congestive heart failure 398.91, 402.01, 402.11, 402.91, 404.01, 404.03, 404.11, 404.13, 404.91, 404.93, 425.4, 425.5, 425.7, 425.8, 425.9, 428
Valvular disease 093.2, 394, 395, 396, 397, 424, 746.3, 746.4, 746.5, 746.6, V42.2, V43.3
Chronic pulmonary disease 416.9, 490, 491, 492, 493, 494, 495, 496, 500, 501, 502, 503, 504, 505, 506.4, 508.1, 508.8
Diabetes 250.0, 250.1, 250.2, 250.3, 250.4, 250.5, 250.6, 250.7, 250.8, 250.9
Congenital heart disease 746.9, 745.4
Atrial fibrillation and flutter 427.3
Sleep apnea 327.21, 327.23, 327.27, 780.51, 780.53, 780.57, 786.03, 786.04
  1. For each of the comorbidities, the study subjects needed to have 2 claims separated by at least 30 days in the year before the interferon initiation to be considered to have that comorbidity