Hey @Alison_Park
Such a coincidence we had almost the same topic regarding ICD10AM just a couple of days ago. I refer you there for more descriptive answers.
Shortly, communication is a key. You need to collaborate with other researchers doing mappings of ICD10CA and you can become a steward of the ICD10CA in the community via the mechanism of Community contributions.
As @Alexdavv mentioned, the way to keep mappings together is Common Data Environment (CDE), developed by the vocabulary team for this purpose.