D89
Header — not billableOther disorders involving the immune mechanism, not elsewhere classified
The ICD-10 code for other disorders involving the immune mechanism, not elsewhere classified is D89.
D89 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 7 more specific codes below.
Clinical notes
Excludes1 (not coded here)
An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).
Excludes2 (not included here)
An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.
- transplant failure and rejection (T86.-)
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under D89
- D89.0Polyclonal hypergammaglobulinemia
- D89.1Cryoglobulinemia
- D89.2Hypergammaglobulinemia, unspecified
- D89.3Immune reconstitution syndrome
- D89.4Mast cell activation syndrome and related disordersnon-billable header
- D89.8Other specified disorders involving the immune mechanism, not elsewhere classifiednon-billable header
- D89.9Disorder involving the immune mechanism, unspecified
Related codes in this category
- D80Immunodeficiency with predominantly antibody defectsnon-billable header
- D81Combined immunodeficienciesnon-billable header
- D82Immunodeficiency associated with other major defectsnon-billable header
- D83Common variable immunodeficiencynon-billable header
- D84Other immunodeficienciesnon-billable header
- D86Sarcoidosisnon-billable header
- D89Other disorders involving the immune mechanism, not elsewhere classifiednon-billable header