B27.99
Billable codeInfectious mononucleosis, unspecified with other complication
The ICD-10 code for infectious mononucleosis, unspecified with other complication is B27.99.
Clinical notes
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Hepatomegaly in unspecified infectious mononucleosis
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- B27.90Infectious mononucleosis, unspecified without complication
- B27.91Infectious mononucleosis, unspecified with polyneuropathy
- B27.92Infectious mononucleosis, unspecified with meningitis
- B27.99Infectious mononucleosis, unspecified with other complication
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 075Approximate match
Associated MS-DRGs
B27.99 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.