Conduction disorder, unspecified
- I45.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
- The 2025 edition of ICD-10-CM I45.9 became effective on October 1, 2024.
- This is the American ICD-10-CM version of I45.9 – other international versions of ICD-10 I45.9 may differ.
Applicable To
- Heart block NOS
- Stokes-Adams syndrome
The following code(s) above I45.9 contain annotation back-references
that may be applicable to I45.9:
- I00-I99 Diseases of the circulatory system
Approximate Synonyms
- Cardiac dysrhythmia (heart rhythm disorder)
- Conduction disorder of the heart
Clinical Information
- A condition of fainting spells caused by heart block, often an atrioventricular block, that leads to bradycardia and drop in cardiac output. When the cardiac output becomes too low, the patient faints (syncope). In some cases, the syncope attacks are transient and in others cases repetitive and persistent.
- A disorder affecting the conduction system that sends electrical signals in the myocardium.
- A disorder characterized by pathological irregularities in the cardiac conduction system.
- Abnormality in rhythm of heartbeat, including rate, regularity, and/or sequence of activation abnormalities
- An episode of sudden and transient loss of consciousness sometimes associated with seizures. It is caused by a sudden decrease of the cardiac output that results from a sudden cardiac dysrhythmia. Typically patients develop an initial pallor, followed by facial flush during recovery.
- An impairment of transmission of the cardiac electrical impulse along the fibers normally responsible impulse propagation.
- Impaired conduction of cardiac impulse that can occur anywhere along the conduction pathway, such as between the sinoatrial node and the right atrium (sa block) or between atria and ventricles (av block). Heart blocks can be classified by the duration, frequency, or completeness of conduction block. Reversibility depends on the degree of structural or functional defects.
- Impairment of conduction in heart excitation; often applied specifically to atrioventricular heart block.
ICD-10-CM I45.9 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):
- 308 Cardiac arrhythmia and conduction disorders with mcc
- 309 Cardiac arrhythmia and conduction disorders with cc
- 310 Cardiac arrhythmia and conduction disorders without cc/mcc
Convert I45.9 to ICD-9-CMCode History
- 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
- 2017 (effective 10/1/2016): No change
- 2018 (effective 10/1/2017): No change
- 2019 (effective 10/1/2018): No change
- 2020 (effective 10/1/2019): No change
- 2021 (effective 10/1/2020): No change
- 2022 (effective 10/1/2021): No change
- 2023 (effective 10/1/2022): No change
- 2024 (effective 10/1/2023): No change
- 2025 (effective 10/1/2024): No change
Code annotations containing back-references to I45.9:
- Code Also: H49.81
- Type 1 Excludes: R55, I45.5
Diagnosis Index entries containing back-references to I45.9:
- Adams-Stokes I45.9 (-Morgagni)
- Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle) I49.9
- block I45.9
- Attack, attacks
- Adams-Stokes I45.9
- Stokes-Adams I45.9
- Block, blocked
- conduction I45.9
- heart I45.9
- arrhythmic I45.9
- cardiac I45.9
- Defect, defectiveQ89.9
- conduction (heart) I45.9
- Delay, delayed
- conduction I45.9 (cardiac) (ventricular)
- Disease, diseased – see also Syndrome
- Adams-Stokes I45.9 (-Morgagni) (syncope with heart block)
- Morgagni-Adams-Stokes I45.9 (syncope with heart block)
- Stokes-Adams I45.9 (syncope with heart block)
- Disorder (of) – see also Disease
- conduction, heart I45.9
- Dropped heart beats I45.9
- Morgagni-Stokes-Adams syndrome I45.9
- Spens’ syndrome I45.9 (syncope with heart block)
- Stokes-Adams disease or syndrome I45.9
- Syndrome – see also Disease
- Adams-Stokes I45.9 (-Morgagni)
- Morgagni-Adams-Stokes I45.9
- Spen’s I45.9
- Stokes I45.9 (-Adams)