Question: My cardiologist diagnosed a patient with sinus bradycardia. Which ICD-10-CM code should I report for this condition? California Subscriber Answer: You should report R00.1 (Bradycardia, unspecified) for sinus bradycardia. Although the code description points to “unspecified bradycardia,” if you look in the ICD-10-CM code book, you will see that code R00.1 also includes the following conditions: Sinus bradycardia defined: Sinus bradycardia is a type of bradycardia that originates from the sinus node of the heart.