Check out these 4 coding tips. Once suspected deep tissue injury has opened to an ulcer, reclassify the ulcer into the appropriate stage. Then code the ulcer for the reclassified stage. 2. Deep tissue injury may be difficult to detect in individuals with dark skin tones. 3. Evolution may be rapid, exposing additional layers of tissue even with optimal treatment. 4. When a lesion due to pressure presents with an intact blister AND the surrounding or adjacent soft tissue does NOT have the characteristics of Deep Tissue Injury, do NOT code here. Source: The above is verbatim from the RAI User's Manual for the MDS 3.0, Chapter 3, page M-19.