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 |