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

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

	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

* Inclusion criteria were applied to records during the index month, † ‡ ¶See Table 1

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