Open coding is the part of the analysis concerned with identifying, naming, categorizing and describing phenomena found in the text. Essentially, each line, sentence, paragraph etc. is read in search of the answer to the repeated question "what is this about? What is being referenced here?"
These labels refer to things like hospitals, information gathering, friendship, social loss, etc. They are the nouns and verbs of a conceptual world. Part of the analytic process is to identify the more general categories that these things are instances of, such as institutions, work activities, social relations, social outcomes, etc.