If this refers to Braddan Cemetery, some of the grave plots were registered to the House of Industry (later the Mannin Infirmary).
Burials are recorded in the register in the usual way, but there will be large numbers of un-related names with the same grave numbers. Unlikely to be a headstone or MI.
The grave ownership records for Braddan Cemetery are in the MNH Library.

I am not sure how the current DHSS system would work.