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  3. Ch. A00-B99
  4. Sec. B25-B34
  5. Category B27
Category B27

Infectious mononucleosis

Clinical Classification Guidelines

Specific Diagnosis Codes

Gammaherpesviral mononucleosis
B27.0
Gammaherpesviral mononucleosis without complication
B27.00
Gammaherpesviral mononucleosis with polyneuropathy
B27.01
Gammaherpesviral mononucleosis with meningitis
B27.02
Gammaherpesviral mononucleosis with other complications
B27.09
Cytomegaloviral mononucleosis
B27.1
Cytomegaloviral mononucleosis without complications
B27.10
Cytomegaloviral mononucleosis with polyneuropathy
B27.11
Cytomegaloviral mononucleosis with meningitis
B27.12
Cytomegaloviral mononucleosis with other complication
B27.19
Other infectious mononucleosis
B27.8
Other infectious mononucleosis without complication
B27.80
Other infectious mononucleosis with polyneuropathy
B27.81
Other infectious mononucleosis with meningitis
B27.82
Other infectious mononucleosis with other complication
B27.89
Infectious mononucleosis, unspecified
B27.9
Infectious mononucleosis, unspecified without complication
B27.90
Infectious mononucleosis, unspecified with polyneuropathy
B27.91
Infectious mononucleosis, unspecified with meningitis
B27.92
Infectious mononucleosis, unspecified with other complication
B27.99
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Data updated for October 2025 release.

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