I'm trying to merge 24 DEM files, 
after applying the tool (Mosaic to New Raster) only 11 out of the 24 merged. 
All the original files are in the same projection, pixel type, band, etc. I also tried DEM to raster tool first before using Mosaic to New Raster and the results were the same.
Answer
This is a common ArcGIS problem. I believe as you zoom-in some of the areas that seem not to be there begin appearing as if it was a rendering issue...
I think, although it has never been confirmed, that it most often happens when mosaicing tiles from File Geodatabase (FGDB) sources and outputting the mosaic raster to the same or other File Godatabase.
My crude workaround is to import the individual source tiles into a File Geodatabase but when mosaicing output the result into a folder as ESRI Grid. When complete import back into FGDB.
I have most success using this approach but also had it fail a few times. When it does, I try mosacing from individual ESRI Grid files and output to an ESRI Grid. When all fails i try the reverse, and so on.
Sounds strange but works for me.
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