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Table 2 Inclusion criteria used to identify adult-onset asthma cases*

From: A longitudinal study of adult-onset asthma incidence among HMO members

  Criteria ICD-9 (CPT) Codes
1 Asthma diagnosis AND outpatient nebulization treatment 493–493.91 AND (94640)
2 Any asthma diagnosis AND ordered oral steroids 493–493.91
3 Any asthma diagnosis AND a second line medication 493–493.91
4 ER visit OR hospital admission for primary asthma diagnosis 493–493.91
5 Asthma diagnosis AND ≥ 2 MDIs 493–493.91
6 Occupational asthma diagnosis 504–507, 495.8, 507.8
  1. * Inclusion criteria were applied to records during the index month, † ‡ ¶See Table 1