ICD-10-CM > A00-B99 > B25-B34 > B27 > B27.1 B27.1 Cytomegaloviral mononucleosis Non-Billable/Non-Specific Codes B27.10Cytomegaloviral mononucleosis without complicationsB27.11Cytomegaloviral mononucleosis with polyneuropathyB27.12Cytomegaloviral mononucleosis with meningitisB27.19Cytomegaloviral mononucleosis with other complication