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    v1.0.28
    OpenPayerBilling CodesSymptoms and signs involving the circulatory and respiratory systemsICD-10-CM r00-abnormalities-of-heart-beat
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    ICD-10-CM Code For Abnormalities Of Heart Beat: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group R00 includes nonspecific and specific abnormal heart rhythms such as palpitations, tachycardia, bradycardia, and other specified and unspecified heart beat irregularities. These ICD-10-CM diagnosis codes are used to document clinical presentations of rhythm disturbance, capture symptom severity, and note whether the abnormality is specified or unspecified. Accurate coding within the ICD-10-CM R00 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM R00: Abnormalities Of Heart Beat Overview

    The diagnoses in this group represent recorded abnormalities in heart rhythm and palpitations affecting the cardiac conduction system. They target signs and symptoms related to arrhythmias rather than specific structural heart disease. Accurate coding matters for correct clinical documentation and influences reimbursement by clarifying the reason for encounter and level of care required.

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    When to Use

    Use a code from this group when a patient presents with documented abnormal heart rhythm or palpitations without assignment to a more specific cardiac diagnosis. Choose the most specific code available that reflects whether the rhythm disturbance is specified or left unspecified.

    ICD-10-CM Codes

    5 rows

    ICD-10-CM CodeDescription
    R00.0Tachycardia, unspecified
    R00.1Bradycardia, unspecified
    R00.2Palpitations
    R00.8Other abnormalities of heart beat
    R00.9Unspecified abnormalities of heart beat

    DRG Codes

    8 rows

    DRG CodeDescription
    308Cardiac Arrhythmia and Conduction Disorders with MCC
    309Cardiac Arrhythmia and Conduction Disorders with CC
    310Cardiac Arrhythmia and Conduction Disorders without CC/MCC
    314Other Circulatory System Diagnoses with MCC
    315Other Circulatory System Diagnoses with CC
    316Other Circulatory System Diagnoses without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • An elderly patient presents to the emergency department with sudden onset palpitations, lightheadedness, and near-syncope after exertion. Vital signs show an irregularly irregular pulse and the ED obtains a 12-lead ECG demonstrating new atrial fibrillation with rapid ventricular response; the clinician documents an abnormal heart rhythm as the presenting problem. A code from this group is assigned to capture the symptomatic arrhythmia as the reason for the visit. Typical codes: R00.0, R00.1
    • A middle-aged outpatient with long-standing anxiety reports intermittent awareness of skipped or extra beats over several months during routine primary care follow-up. Physical exam and intermittent ambulatory monitoring show occasional premature ventricular contractions without hemodynamic compromise; the visit documents palpitations as an ongoing symptom separate from structural heart disease. A symptom code from this group is used to record the patient’s chronic complaint of palpitations when the encounter focuses on symptom management rather than a definitive arrhythmia diagnosis. Typical codes: R00.2, R00.8
    • A hospitalized patient recovering from acute myocardial infarction develops new-onset bradycardia with dizziness and hypotension requiring evaluation by cardiology. The bradyarrhythmia is documented as a clinical sign complicating the inpatient course and prompting monitoring and potential pacing. A sign-level code from this group is assigned to capture the abnormal heart beat as a complicating clinical finding in the hospital record. Typical codes: R00.1, R00.9

    Related Codes

    R01-CARDIAC-MURMURS-AND-OTHER-CARDIAC-SOUNDS

    ICD-10-CM Code For Cardiac Murmurs And Other Cardiac Sounds: Group Overview

    R03-ABNORMAL-BLOOD-PRESSURE-READING

    ICD-10-CM Code For Abnormal Blood-Pressure Reading Without Diagnosis: Group Overview

    R04-HEMORRHAGE-FROM-RESPIRATORY-PASSAGES

    ICD-10-CM Code For Hemorrhage From Respiratory Passages: Group Overview

    R05-COUGH

    ICD-10-CM Code For Cough: Group Overview

    R06-ABNORMALITIES-OF-BREATHING

    ICD-10-CM Code For Abnormalities Of Breathing: Group Overview

    R07-PAIN-IN-THROAT-AND-CHEST

    ICD-10-CM Code For Pain In Throat And Chest: Group Overview

    R09-OTHER-SYMPTOMS-AND-SIGNS

    ICD-10-CM Code For Other Symptoms And Signs Involving The Circulatory And Respiratory System: Group Overview

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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