Cognitive informatics attempts to solve problems in two connected areas in a bidirectional and multidisciplinary approach. In one direction, CI uses informatics and computing techniques to investigate cognitive science problems, such as memory, learning and reasoning; in the other direction, CI uses cognitive theories to investigate problems in informatics, computing and software engineering (p.120).
I will leave it to you to consider the INTRA-INTERPERSONAL and SCIENCES domains, and not (just) how Wang's cognitive informatics 'fits' within Hodges' model, but what of the many other informatics fields. Here they seem like stepping stones, but taken together where do they lead to, from, ... about ...?
Wang, Y. (2003), Cognitive Informatics: A New Transdisciplinary Research Field, Brain and Mind: A Transdisciplinary Journal of Neuroscience and Neurophilosophy, Vol.4, No.2. pp.115-127.