Transient neonatal thrombocytopenia

This code describes a temporary decrease in platelet count in a newborn, typically resolving spontaneously within days or weeks after birth. It is characterized by a platelet count below 150,000/µL without an identifiable underlying pathological cause.

Use this code for newborns diagnosed with a low platelet count that is transient and not attributed to a primary maternal condition, infection, or other neonatal pathology. Documentation should clearly state "transient" or "idiopathic" neonatal thrombocytopenia.

• Do not use this code if the thrombocytopenia is secondary to a maternal condition (e.g., maternal ITP), neonatal infection, or other identifiable cause; instead, code the underlying condition.
• Ensure documentation specifies "neonatal" and "transient" to differentiate from other forms of thrombocytopenia.
• This code is typically a principal diagnosis for the thrombocytopenia itself, but may be a secondary diagnosis if another condition is the primary reason for admission.