Table 2.

Stages of cost analysis with types of costs included.

Stage of analysis	Type of costs	Type of procedures included
I	General	All medical procedures realized for patients
II	COPD related	Medical procedures realized due to COPD and other diseases of the respiratory system (the list of DRG codes of diseases and conditions requiring medical procedures included in stage II is available in Supplementary Table 1)
III	Exacerbation related (ER)	Medical procedures realized due to exacerbations of COPD (the list of DRG codes of diseases and conditions requiring medical procedures included in stage III is available in Supplementary Table 2).