B27.80 Other infectious mononucleosis without complication

Billable ICD-10-CM code, FY2026.

Applies from B27 Infectious mononucleosis

Includes

• glandular fever
• monocytic angina
• Pfeiffer's disease

MS-DRG index

Defines the logic of DRG(s) 865-866 in MDC 18.

Approximate ICD-9-CM (GEMs)

• 075 Infectious mononucleosis (approximate)

Code annotations containing back-references to B27.80

Back-references to B27.8

• Type 1 Excludes: G63 Polyneuropathy in diseases classified elsewhere ("infectious mononucleosis complicated by polyneuropathy (B27.0-B27.9 with fifth character 1)")
• Code First: K77 Liver disorders in diseases classified elsewhere ("infectious mononucleosis with liver disease (B27.0-B27.9 with fifth character 9)")

Back-references to B27

• Type 1 Excludes: D72.821 Monocytosis (symptomatic) ("infectious mononucleosis (B27.-)")
• Type 1 Excludes: G02 Meningitis in other infectious and parasitic diseases classified elsewhere ("infectious mononucleosis complicated by meningitis (B27.- with fifth character 2)")
• Code First: H67 Otitis media in diseases classified elsewhere ("viral disease NEC (B00-B34)")
• Type 1 Excludes: J02.8 Acute pharyngitis due to other specified organisms ("acute pharyngitis due to infectious mononucleosis (B27.-)")

Diagnosis Index entries for B27.80

• Mononucleosis, infectious › specified NEC

Nearby codes

• B27.10 Cytomegaloviral mononucleosis without complications
• B27.11 Cytomegaloviral mononucleosis with polyneuropathy
• B27.12 Cytomegaloviral mononucleosis with meningitis
• B27.19 Cytomegaloviral mononucleosis with other complication
• B27.8 Other infectious mononucleosis
• B27.80 Other infectious mononucleosis without complication (this code)
• B27.81 Other infectious mononucleosis with polyneuropathy
• B27.82 Other infectious mononucleosis with meningitis
• B27.89 Other infectious mononucleosis with other complication
• B27.9 Infectious mononucleosis, unspecified
• B27.90 Infectious mononucleosis, unspecified without complication