L98.A12Non-pressure chronic ulcer of left upper arm

L98.A12 is the ICD-10-CM diagnosis code for Non-pressure chronic ulcer of left upper arm. It belongs to category L98 (other disorders of skin and subcutaneous tissue, not elsewhere classified), block L80-L99 (other disorders of the skin and subcutaneous tissue) and chapter 12 (diseases of the skin and subcutaneous tissue). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.

Within L98.A1 (Non-pressure chronic ulcer of upper arm), L98.A12 is specifically for Non-pressure chronic ulcer of left upper arm. Related codes cover right upper arm (L98.A11) and unspecified upper arm (L98.A19).

To report this condition, pick the subcode that matches the documentation: L98.A121 (limited to breakdown of skin), L98.A122 (with fat layer exposed), L98.A123 (with necrosis of muscle), L98.A124 (with necrosis of bone), L98.A125 (with muscle involvement without evidence of necrosis), L98.A126 (with bone involvement without evidence of necrosis), L98.A128 (with other specified severity) and L98.A129 (with unspecified severity).

It was added in FY2026, effective October 1, 2025.