Although both .mtdd and .m files seems to be used by MATlab, a direct mtdd to m conversion seems highly unlikely. However, there may be some sort of transfer of data or work around possible, but that's something you will need to do using MATlab and no 3rd party app will help you.
Convert MEDITECH document definition file to MatLab function, commands, script.
We have found one software suitable in our database for this conversion.
Multiplatform software - convert mtdd to m on any platform
A high-level technical computing language and interactive numeric computation
Convert from mtdd file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.