  Driven by the visions of Data Science, recent years have seen a paradigm
shift in Natural Language Processing (NLP). NLP has set the milestone in text
processing and proved to be the preferred choice for researchers in the
healthcare domain. The objective of this paper is to identify the potential of
NLP, especially, how NLP is used to support the knowledge management process in
the healthcare domain, making data a critical and trusted component in
improving the health outcomes. This paper provides a comprehensive survey of
the state-of-the-art NLP research with a particular focus on how knowledge is
created, captured, shared, and applied in the healthcare domain. Our findings
suggest, first, the techniques of NLP those supporting knowledge management
extraction and knowledge capture processes in healthcare. Second, we propose a
conceptual model for the knowledge extraction process through NLP. Finally, we
discuss a set of issues, challenges, and proposed future research areas.
