D72.821 Monocytosis (symptomatic)

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• infectious mononucleosis (B27.-)

Applies from D72 Other disorders of white blood cells

Excludes1 (never code together)

• basophilia (D72.824)
• immunity disorders (D80-D89)
• neutropenia (D70)
• preleukemia (syndrome) (D46.9)

Applies from D72.8 Other specified disorders of white blood cells

Excludes1 (never code together)

• leukemia (C91-C95)

Applies from D72.82 Elevated white blood cell count

Excludes1 (never code together)

• eosinophilia (D72.1)

MS-DRG index

Defines the logic of DRG(s) 814-816 in MDC 16.

Approximate ICD-9-CM (GEMs)

• 288.63 Monocytosis (symptomatic)

Diagnosis Index entries for D72.821

• Monocytosis (symptomatic)

Nearby codes

• D72.810 Lymphocytopenia
• D72.818 Other decreased white blood cell count
• D72.819 Decreased white blood cell count, unspecified
• D72.82 Elevated white blood cell count
• D72.820 Lymphocytosis (symptomatic)
• D72.821 Monocytosis (symptomatic) (this code)
• D72.822 Plasmacytosis
• D72.823 Leukemoid reaction
• D72.824 Basophilia
• D72.825 Bandemia
• D72.828 Other elevated white blood cell count