M86.4Chronic osteomyelitis with draining sinus

M86.4 is the ICD-10-CM diagnosis code for chronic osteomyelitis with draining sinus. It belongs to category M86 (osteomyelitis), block M86-M90 (other osteopathies) 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 10 subcodes must be used instead.

Within M86 (osteomyelitis), M86.4 is specifically for chronic osteomyelitis with draining sinus. Related codes cover acute hematogenous osteomyelitis (M86.0), other acute osteomyelitis (M86.1), subacute osteomyelitis (M86.2), chronic multifocal osteomyelitis (M86.3), other chronic hematogenous osteomyelitis (M86.5), other chronic osteomyelitis (M86.6), other osteomyelitis (M86.8) and unspecified (M86.9).

To report this condition, pick the subcode that matches the documentation: M86.40 (unspecified site), M86.41 (shoulder), M86.42 (humerus), M86.43 (radius and ulna), M86.44 (hand), M86.45 (femur), M86.46 (tibia and fibula), M86.47 (ankle and foot) and 2 more.

Use an additional code (B95-B97) to identify infectious agent. Use an additional code to identify major osseous defect, if applicable (M89.7-).

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