All ICD10 Codes

B27.9

Non-Billable
ChapterA00–B99
Ranksubcategory
Official Description

Infectious mononucleosis, unspecified

Use a more specific code (4 billable)
B27.90Infectious mononucleosis, unspecified without complicationB27.91Infectious mononucleosis, unspecified with polyneuropathyB27.92Infectious mononucleosis, unspecified with meningitisB27.99Infectious mononucleosis, unspecified with other complication
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 1: Certain Infectious and Parasitic Diseases (A00-B99).
General instructions are available for the parent sections:
View CH1 NotesView B27 Notes

Clinical Hierarchy

BillableHas subcodes
CH1Certain infectious and parasitic diseases (A00-B99)
B25-B34Other viral diseases (B25-B34)
B27Infectious mononucleosis
B27.9Infectious mononucleosis, unspecifiedNot billable
B27.90Infectious mononucleosis, unspecified without complicationBillable
B27.91Infectious mononucleosis, unspecified with polyneuropathyBillable
B27.92Infectious mononucleosis, unspecified with meningitisBillable
B27.99Infectious mononucleosis, unspecified with other complicationBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to B27.9:

categoryB27
Infectious mononucleosis
View context instructions
chapterCH1
Certain infectious and parasitic diseases (A00-B99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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