2020 ICD-10-CM Diagnosis Code I45.9

Conduction disorder, unspecified

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I45.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM I45.9 became effective on October 1, 2019.
  • 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
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to I45.9:
  • I00-I99
    2020 ICD-10-CM Range I00-I99

    Diseases of the circulatory system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    • systemic connective tissue disorders (M30-M36)
    • transient cerebral ischemic attacks and related syndromes (G45.-)
    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 v37.0):
  • 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-CM

Code 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
Code annotations containing back-references to I45.9:
  • Type 1 Excludes: I45.5
    , R55
    ICD-10-CM Diagnosis Code I45.5

    Other specified heart block

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Sinoatrial block
    • Sinoauricular block
    Type 1 Excludes
    ICD-10-CM Diagnosis Code R55

    Syncope and collapse

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Blackout
    • Fainting
    • Vasovagal attack
    Type 1 Excludes
    • cardiogenic shock (R57.0)
    • carotid sinus syncope (G90.01)
    • heat syncope (T67.1)
    • neurocirculatory asthenia (F45.8)
    • neurogenic orthostatic hypotension (G90.3)
    • orthostatic hypotension (I95.1)
    • postprocedural shock (T81.1-)
    • psychogenic syncope (F48.8)
    • shock NOS (R57.9)
    • shock complicating or following abortion or ectopic or molar pregnancy (O00-O07, O08.3)
    • shock complicating or following labor and delivery (O75.1)
    • Stokes-Adams attack (I45.9)
    • unconsciousness NOS (R40.2-)
  • Use Additional: H49.81
    ICD-10-CM Diagnosis Code H49.81

    Kearns-Sayre syndrome

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Applicable To
    • Progressive external ophthalmoplegia with pigmentary retinopathy
    Use Additional
    • code for other manifestation, such as:
    • heart block (I45.9)

Diagnosis Index entries containing back-references to I45.9:
  • Adams-Stokes I45.9 (-Morgagni)
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal) (reflex)(sinus)(supraventricular)(transitory)(ventricle) I49.9
    ICD-10-CM Diagnosis Code I49.9

    Cardiac arrhythmia, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Arrhythmia (cardiac) NOS
    • block I45.9
  • Attack, attacks
    • Adams-Stokes I45.9
    • Stokes-Adams I45.9
  • Block, blocked
  • Defect, defective Q89.9
    ICD-10-CM Diagnosis Code Q89.9

    Congenital malformation, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code POA Exempt
    Applicable To
    • Congenital anomaly NOS
    • Congenital deformity NOS
  • 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)

ICD-10-CM Codes Adjacent To I45.9
I45.10 Unspecified right bundle-branch block
I45.19 Other right bundle-branch block
I45.2 Bifascicular block
I45.3 Trifascicular block
I45.4 Nonspecific intraventricular block
I45.5 Other specified heart block
I45.6 Pre-excitation syndrome
I45.8 Other specified conduction disorders
I45.81 Long QT syndrome
I45.89 Other specified conduction disorders
I45.9 Conduction disorder, unspecified
I46 Cardiac arrest
I46.2 Cardiac arrest due to underlying cardiac condition
I46.8 Cardiac arrest due to other underlying condition
I46.9 Cardiac arrest, cause unspecified
I47 Paroxysmal tachycardia
I47.0 Re-entry ventricular arrhythmia
I47.1 Supraventricular tachycardia
I47.2 Ventricular tachycardia
I47.9 Paroxysmal tachycardia, unspecified
I48 Atrial fibrillation and flutter

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.