DM with osteomyelitis and debridement to the bone

Patient admitted with infected diabetic foot ulcer w/ osteomyelitis.  CDS queried to link the ulcer to DM which was done and CDS coded with that as Pdx. Pt had debridement of the ulcer and there was a mismatch because CDI had it at the DRG for DM and coding went to DRG for osteo.   Can someone explain?  I thought that with the automatic link from osteomyelitis to  DM, this would stay in the Diabetes DRG? I thought Osteomyelitis DRG was for osteomyelitis without DM, or if MD specified it wasn't due to DM.  Any help appreciated!  

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