D89Other disorders involving the immune mechanism, not elsewhere classified

D89 is the ICD-10-CM diagnosis code for other disorders involving the immune mechanism, not elsewhere classified. It belongs to block D80-D89 (certain disorders involving the immune mechanism) and chapter 3 (diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: D89.0 (hypergammaglobulinemia), D89.1 (Cryoglobulinemia), D89.2 (unspecified), D89.3 (syndrome), D89.4 (disorders), D89.8 (classified) and D89.9 (unspecified).

Don't report D89 together with the conditions in its Excludes1 note: hyperglobulinemia NOS (R77.1) and monoclonal gammopathy (of undetermined significance) (D47.2).

The conditions in its Excludes2 note aren't part of D89, but may be coded alongside it if the patient has both: transplant failure and rejection (T86.-).

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