Other infectious mononucleosis with other complication

This code signifies a diagnosis of infectious mononucleosis due to an unspecified or less common etiology (not Epstein-Barr virus) that has resulted in a complication other than those specifically classified elsewhere. It indicates the presence of an atypical or non-EBV mononucleosis syndrome accompanied by an additional, non-specific adverse health event.

Use this code when documentation confirms infectious mononucleosis not identified as due to Epstein-Barr virus (e.g., cytomegalovirus, toxoplasmosis, HIV primary infection) and the patient presents with a complication such as hepatitis, splenic rupture, or neurological involvement, provided a more specific complication code is not available. This code is appropriate when the specific type of mononucleosis is known to be non-EBV, and the complication is clearly documented but doesn't have a dedicated code.

• Ensure the documentation explicitly states "other" or "unspecified" infectious mononucleosis, or identifies a non-EBV cause.
• Verify that a complication is clearly documented and that no more specific code exists for that particular complication in conjunction with mononucleosis.
• Do not use this code if the mononucleosis is confirmed as Epstein-Barr virus (EBV) or if the complication is specifically classified elsewhere (e.g., B27.01 for EBV mononucleosis with splenic rupture).