I46.9
BillableCardiac arrest, cause unspecified
HCC Category Mapping
V28HCC 213 — Cardio-Respiratory Failure and Shock
0.000V24HCC 84 — Cardio-Respiratory Failure and Shock
0.402ESRDHCC 84 — Cardio-Respiratory Failure and Shock
0.000What This Code Means
The heart suddenly stops beating effectively, but the reason for the arrest has not been determined or documented.
Coding Tips
- •This is a non-specific code; attempt to determine the underlying cause from clinical documentation
- •Query the provider if the cause of cardiac arrest can be identified
Clinical Significance
Cardiac arrest with unspecified cause indicates the heart suddenly stopped without a determined etiology. While this code captures the critical event for risk adjustment, the lack of causal specificity limits clinical value. A provider query should be pursued to identify the underlying cause when possible.
Documentation Requirements
- ✓Provider documentation of cardiac arrest event
- ✓Documentation that the underlying cause could not be determined
- ✓Circumstances and timing of the arrest
- ✓Resuscitation details and patient outcome
- ✓Post-arrest workup performed to identify the cause
Commonly Confused Codes
I46.2 — Cardiac arrest due to underlying cardiac condition; use when a cardiac cause is identifiedI46.8 — Cardiac arrest due to other underlying condition; use when a non-cardiac cause is identifiedR99 — Ill-defined and unknown cause of mortality; for death certificate codingI49.01 — Ventricular fibrillation; the rhythm, not the arrest event