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Table 2 Frequency of different diagnosis codes

From: Which ICD-9-CM codes should be used for bronchiolitis research?

  Aged ≤6 months Aged ≤12 months Aged ≤24 months
Broad Diagnosis 18, 773 (100) 35, 645 (100) 48, 269 (100)
 Bronchospasm codes 556 (3.0) 971 (2.7) 1291 (2.7)
 Asthma codes 8714 (46.4) 17, 200 (48.3) 24, 197 (50.1)
 Bronchiolitis codes 5420 (28.9) 9367 (26.3) 11, 367 (23.6)
 Bronchitis codes 4083 (21.8) 8107 (22.7) 11, 414 (23.6)
Narrow Diagnosis 9503 (50.6) 17, 474 (49.0) 22, 781 (47.2)
 Bronchiolitis codes 5420 (28.9) 9367 (26.3) 11, 367 (23.6)
 Bronchitis codes 4083 (21.8) 8107 (22.7) 11, 414 (23.6)
  1. Frequency of different diagnosis codes and categories for each age group. The broad diagnosis category includes all children. The narrow diagnosis classification includes bronchiolitis and bronchitis codes. The broad classification includes the narrow diagnosis codes plus codes for bronchospasm and asthma. Percentages are in parentheses and may not sum to 100 due to rounding