Other specified heart block

This code signifies a type of cardiac conduction disturbance where electrical signals from the atria to the ventricles are partially or completely blocked, but the specific type of block (e.g., Mobitz I, Mobitz II, third-degree) is not explicitly documented. It represents an unspecified form of heart block that doesn't fit into other defined categories.

Use this code when the physician's documentation clearly states "heart block" but does not specify the degree (first, second, third) or type (e.g., Mobitz I, Mobitz II). This code is appropriate when the provider identifies a heart block but lacks the specificity required for more precise coding.

• Avoid using this code if the documentation specifies a particular type or degree of heart block; instead, select the more specific code.
• Query the provider for clarification if "heart block" is documented without further detail to determine if a more specific code can be assigned.
• Remember the Excludes1 note for I45.9 (heart block NOS), meaning these two codes should never be reported together.