ICD-10-CM category
B27: Infectious mononucleosis
Codes under B27 (Infectious mononucleosis). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| B27.0 | Gammaherpesviral mononucleosis | — |
| B27.00 | Gammaherpesviral mononucleosis without complication | ✓ |
| B27.01 | Gammaherpesviral mononucleosis with polyneuropathy | ✓ |
| B27.1 | Cytomegaloviral mononucleosis | — |
| B27.02 | Gammaherpesviral mononucleosis with meningitis | ✓ |
| B27.8 | Other infectious mononucleosis | — |
| B27.09 | Gammaherpesviral mononucleosis with other complications | ✓ |
| B27.9 | Infectious mononucleosis, unspecified | — |
| 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 | ✓ |
| B27.80 | Other infectious mononucleosis without complication | ✓ |
| B27.81 | Other infectious mononucleosis with polyneuropathy | ✓ |
| B27.82 | Other infectious mononucleosis with meningitis | ✓ |
| B27.89 | Other infectious mononucleosis with other complication | ✓ |
| B27.90 | Infectious mononucleosis, unspecified without complication | ✓ |
| B27.91 | Infectious mononucleosis, unspecified with polyneuropathy | ✓ |
| B27.92 | Infectious mononucleosis, unspecified with meningitis | ✓ |
| B27.99 | Infectious mononucleosis, unspecified with other complication | ✓ |
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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