ICD-10-CM > D50-D89 > D70-D77 > D72 > D72.8 > D72.81 D72.81 Decreased white blood cell count Non-Billable/Non-Specific Type 2 Excludes neutropenia (D70) Codes D72.810LymphocytopeniaD72.818Other decreased white blood cell countD72.819Decreased white blood cell count, unspecified