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. 2015 Dec 3;10:2609–2618. doi: 10.2147/COPD.S90148

Figure 1.

Figure 1

Patient selection.

Notes: aCOPD diagnosis: ≥2 medical claims occurring on separate dates within 90 days with a COPD diagnosis code (ICD-9-CM code 491.xx, 492.xx, or 496.xx) in the primary or secondary position; b≥1 medical claim with any of the following ICD-9-CM diagnosis codes in any position: 277.0x (cystic fibrosis), 011.x (pulmonary tuberculosis), or 140.xx–172.xx, 174.xx–209.3x, 209.7x (malignant neoplasms); cIndex date: the date of first medical claim with a COPD diagnosis during the identification period; dPreindex period: a 12-month period prior to index date; ePostindex period: a 24-month period after index date.

Abbreviations: ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification; MAPD, Medicare advantage plan with prescription drug benefits.