D89
Other disorders involving the immune mechanism, not elsewhere classified
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 15 never code together
D89code
D80-D89block
D50-D89chapter
Excludes2
- autoimmune disease (systemic) NOS (M35.9)M35.9
- certain conditions originating in the perinatal period (P00-P96)P00-P96
- complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Q00-Q99
- endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
- human immunodeficiency virus [HIV] disease (B20)B20
- injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
- neoplasms (C00-D49)C00-D49
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 3
D80-D89block
Includes
- defects in the complement system
- immunodeficiency disorders, except human immunodeficiency virus [HIV] disease
- sarcoidosis
Index entries leading here filed at null
No alphabetic index entry points at this code.
Subordinate codes 7
D89.0 Polyclonal hypergammaglobulinemia D89.1 Cryoglobulinemia D89.2 Hypergammaglobulinemia, unspecified D89.3 Immune reconstitution syndrome D89.4 Mast cell activation syndrome and related disorders D89.8 Oth disrd involving the immune mechanism, NEC D89.9 Disorder involving the immune mechanism, unspecified
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.