Chronic obstructive pulmonary disease and allied conditions (490-496)

491 Chronic bronchitis

• 491.0 - Simple chr bronchitis
• 491.1 - Mucopurul chr bronchitis
• 491.20 - Obst chr bronc w/o exac
• 491.21 - Obs chr bronc w(ac) exac
• 491.22 - Obs chr bronc w ac bronc
• 491.8 - Chronic bronchitis NEC
• 491.9 - Chronic bronchitis NOS