ICD-10-CM Alphabetic Index · FY 2026 25 Entries

Mononucleosis in the ICD-10-CM Index ICD-10-CM

The main term Mononucleosis, infectious carries 25 index entries pointing to 16 ICD-10-CM codes. The default entry is B27.90, the code the bare main term maps to; every indented line below refines the term by site, cause, or type. Verify any candidate code in the Tabular List before using it.

✓ Built from the official CMS FY 2026 index fileEffective Oct 1, 2025 – Sep 30, 2026
25
Index Entries
16
Codes Referenced
B27.90
Default Code
M
Letter
25 of 25 shown
ICD-10-CM

Index Entries Under Mononucleosis 25 entries · 16 codes

Mononucleosis, infectious B27.90
with
complication NEC B27.99
meningitis B27.92
polyneuropathy B27.91
cytomegaloviral B27.10
with
complication NEC B27.19
meningitis B27.12
polyneuropathy B27.11
Epstein-Barr (virus) B27.00
with
complication NEC B27.09
meningitis B27.02
polyneuropathy B27.01
gammaherpesviral B27.00
with
complication NEC B27.09
meningitis B27.02
polyneuropathy B27.01
specified NEC B27.80
with
complication NEC B27.89
meningitis B27.82
polyneuropathy B27.81

The info icon previews the code's description and billable status; the code link opens its full page with all notations.

Related Index Terms

All index terms starting with MIndex to Diseases and InjuriesICD-10-CM Code Lookup

Source: Centers for Medicare & Medicaid Services, FY 2026 ICD-10-CM Index to Diseases and Injuries release files, effective October 1, 2025 through September 30, 2026.