ICD-10-CM > R00-R99 > R00-R09 > R00 R00 Abnormalities of heart beat Non-Billable/Non-Specific Type 1 Excludes abnormalities originating in the perinatal period (P29.1-) Type 2 Excludes specified arrhythmias (I47-I49) Codes R00.0Tachycardia, unspecifiedR00.1Bradycardia, unspecifiedR00.2PalpitationsR00.8Other abnormalities of heart beatR00.9Unspecified abnormalities of heart beat