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. 2016 Dec 22;12:115–122. doi: 10.2147/COPD.S114802

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. bIndex date: The date of first medical claim with a COPD diagnosis during the identification period. cPre-index period: A 12-month period prior to index date. dPost-index period: A 24-month period after index date. e≥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).

Abbreviations: ICD-9-CM, International Classification of Diseases, Ninth Revision, Clinical Modification; MAPD, Medicare Advantage plans with Prescription Drug benefits.