Hello, any update on this, I know I have been a pest asking this again and again.
The IHIS team is actively working on harmonizing the 2015 NHIS. There have been some back-end difficulties that have slowed down the processing of the data, but we hope to make it available in the next few weeks. Unfortunately it is not possible for us to provide a more pinpointed timeline as the problems have been sporadic and unpredictable.
I hope this helps!
The 2015 NHIS is now available via IHIS!