M61.26Paralytic calcification and ossification of muscle, lower leg

M61.26 is the ICD-10-CM diagnosis code for paralytic calcification and ossification of muscle, lower leg. It belongs to category M61 (calcification and ossification of muscle), block M60-M63 (disorders of muscles) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within M61.2 (paralytic calcification and ossification of muscle), M61.26 is specifically for paralytic calcification and ossification of muscle, lower leg. Related codes cover unspecified site (M61.20), shoulder (M61.21), upper arm (M61.22), forearm (M61.23), hand (M61.24), thigh (M61.25), ankle and foot (M61.27), other site (M61.28) and 1 more.

To report this condition, pick the subcode that matches the documentation: M61.261 (leg), M61.262 (leg) and M61.269 (leg).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.