ICD-10-CM > R00-R99 > R90-R94 > R94 > R94.3 R94.3 Abnormal results of cardiovascular function studies Non-Billable/Non-Specific Codes R94.30Abnormal result of cardiovascular function study, unspecifiedR94.31Abnormal electrocardiogram [ECG] [EKG]R94.39Abnormal result of other cardiovascular function study