ICD-10 diagnosis code

D89 Other disorders involving the immune mechanism, not elsewhere classified

D89 is the ICD-10 code for Other disorders involving the immune mechanism, not elsewhere classified. It is a three-character category divided into 6 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block D80–D89 (Certain disorders involving the immune mechanism) in Chapter III, Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism.

Code type: Category (3 characters)
Chapter: III · D50–D89
Classification: WHO ICD-10, 2019 version

What D89 excludes

Conditions that look similar but belong under another code.

hyperglobulinaemia NOS R77.1
monoclonal gammopathy of undertermined significance [MGUS] D47.2
transplant failure and rejection T86.-

Subcodes of D89

D89 in national editions

Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.

SwedenICD-10-SE

D89Andra rubbningar i immunsystemet som ej klassificeras på annan plats

DenmarkICD-10-DK

DD89Andre forstyrrelser i immunsystemet IKA

FinlandICD-10-FI

D89Muualla luokittamattomat muut immuunimekanismiin kohdistuvat häiriöt

GermanyICD-10-GM

D89Sonstige Störungen mit Beteiligung des Immunsystems, anderenorts nicht klassifiziert

FranceICD-10-FR

D89Autres anomalies du système immunitaire, non classées ailleurs

NetherlandsICD-10-NL

D89overige aandoeningen waarbij immuunsysteem betrokken is, niet elders

United StatesICD-10-CM

Listed through more specific codes:

D89.40Mast cell activation, unspecified
D89.41Monoclonal mast cell activation syndrome
D89.42Idiopathic mast cell activation syndrome
D89.43Secondary mast cell activation
D89.44Hereditary alpha tryptasemia
D89.49Other mast cell activation disorder

Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.

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