R94.31 Abnormal electrocardiogram [ECG] [EKG]

Billable ICD-10-CM code, FY2026.

Excludes1 (never code together)

• long QT syndrome (I45.81)

Applies from R94 Abnormal results of function studies

Includes

• abnormal results of radionuclide [radioisotope] uptake studies
• abnormal results of scintigraphy

MS-DRG index

Defines the logic of DRG(s) 314-316 in MDC 05.

Approximate ICD-9-CM (GEMs)

• 794.31 Nonspecific abnormal electrocardiogram [ECG] [EKG]

Code annotations containing back-references to R94.31

Back-references to R94

• Type 1 Excludes: T88.7 Unspecified adverse effect of drug or medicament ("specified adverse effects of drugs and medicaments (A00-R94 and T80-T88.6, T88.8)")

Diagnosis Index entries for R94.31

• Abnormal, abnormality, abnormalities › electrocardiogram [ECG] [EKG]
• Prolonged, prolongation (of) › QT interval

Nearby codes

• R94.131 Abnormal electromyogram [EMG]
• R94.138 Abnormal results of other function studies of peripheral nervous system
• R94.2 Abnormal results of pulmonary function studies
• R94.3 Abnormal results of cardiovascular function studies
• R94.30 Abnormal result of cardiovascular function study, unspecified
• R94.31 Abnormal electrocardiogram [ECG] [EKG] (this code)
• R94.39 Abnormal result of other cardiovascular function study
• R94.4 Abnormal results of kidney function studies
• R94.5 Abnormal results of liver function studies
• R94.6 Abnormal results of thyroid function studies
• R94.7 Abnormal results of other endocrine function studies