ICD-9-CM Codes ICD-9-PCS Codes

279.8 - Other specified disorders involving the immune mechanism

GEM Conversion to ICD-10 CM

D84.1

Fs: 10000 – Defects in the complement system

D89.40

Fs: 10000 – Mast cell activation, unspecified

D89.41

Fs: 10000 – Monoclonal mast cell activation syndrome

D89.42

Fs: 10000 – Idiopathic mast cell activation syndrome

D89.43

Fs: 10000 – Secondary mast cell activation

D89.49

Fs: 10000 – Other mast cell activation disorder

D89.89

Fs: 10000 – Other specified disorders involving the immune mechanism, not elsewhere classified

M35.9

Fs: 10000 – Systemic involvement of connective tissue, unspecified

Sibling Codes

279.2

Combined immunity deficiency

279.3

Unspecified immunity deficiency

279.8

Other specified disorders involving the immune mechanism

279.9

Unspecified disorder of immune mechanism