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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
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Environmental Health

ISSN: 1476-069X