B27.91

Billable

Infectious mononucleosis, unspecified with polyneuropathy

B27.91 is the ICD-10-CM code for Infectious mononucleosis, unspecified with polyneuropathy. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
A00-B99
Parent
B27.9
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

What is infectious mononucleosis (mono)? Infectious mononucleosis (mono) is a disease caused by viruses .The most common cause is the Epstein-Barr virus (EBV). Mono is contagious, which means it can spread from person to person. It is common among teenagers and young adults, especially college students. What causes infectious mononucleosis (mono)? Mono can be caused by many different viruses. But it is most often…

Read more about Infectious Mononucleosis at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

No additional coding notes for this code.

Conditions mapped to this code

MedlinePlus · NIH

Plain-language health-topic references grounded in MedlinePlus (NIH/NLM).

Frequently asked questions

What is ICD-10 code B27.91?
B27.91 is the ICD-10-CM code for "Infectious mononucleosis, unspecified with polyneuropathy". It falls under A00-B99 Certain infectious and parasitic diseases.
Is B27.91 a billable code?
Yes — B27.91 is a billable, specific ICD-10-CM code valid for reimbursement.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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