ICD-10 Code I46.8 – Cardiac arrest due to other underlying condition (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I46.8 – Cardiac arrest due to other underlying condition
What it is
I46.8 identifies cardiac arrest caused by an underlying condition other than the common categories listed elsewhere. Use it when the arrest is documented as secondary to a specific cause that does not fit a more precise code.
Clinical signs
Cardiac arrest is typically documented by sudden loss of pulse, unresponsiveness, and need for immediate resuscitation. Clinical features vary; refer to documentation for the underlying condition linked to the arrest.
When to use this code
Use this code when the record states cardiac arrest due to another underlying condition and no more specific cardiac arrest code applies. It may appear in emergency, inpatient, or death-related documentation when the cause is clearly linked. Check documentation for the exact underlying condition.
Do not use for
Do not use this code for cardiac arrest with a more specific documented cause or when the cause is not stated. Check documentation if the note describes only respiratory arrest, syncope, or another event without true cardiac arrest.
Coding tip
Assign the underlying condition first when documented, and use I46.8 only when the record clearly supports cardiac arrest as the reported diagnosis.