D89.9

ICD-10Billable

Disorder involving the immune mechanism, unspecified

Official ICD-10-CM descriptor (FY2026)

Disorder involving the immune mechanism, unspecified

D89.9 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

Immune disease NOS

Related codes in D89

Where this code sits

Chapter: 3. Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
Block: Certain disorders involving the immune mechanism (D80-D89)
Parent code: D89

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.