2020 ICD-10-CM Diagnosis Code I49.5

Sick sinus syndrome

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I49.5 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 I49.5 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I49.5 - other international versions of ICD-10 I49.5 may differ.
Applicable To
  • Tachycardia-bradycardia syndrome
The following code(s) above I49.5 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 I49.5:
  • 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
  • I49
    ICD-10-CM Diagnosis Code I49

    Other cardiac arrhythmias

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Code First
    • cardiac arrhythmia complicating:
    • abortion or ectopic or molar pregnancy (O00-O07, O08.8)
    • obstetric surgery and procedures (O75.4)
    Type 1 Excludes
    • neonatal dysrhythmia (P29.1-)
    • sinoatrial bradycardia (R00.1)
    • sinus bradycardia (R00.1)
    • vagal bradycardia (R00.1)
    Type 2 Excludes
    Other cardiac arrhythmias
Approximate Synonyms
  • Bradycardia tachycardia syndrome
  • Sinus node dysfunction
  • Tachycardia-bradycardia
Clinical Information
  • A condition caused by dysfunctions related to the sinoatrial node including impulse generation (cardiac sinus arrest) and impulse conduction (sinoatrial exit block). It is characterized by persistent bradycardia, chronic atrial fibrillation, and failure to resume sinus rhythm following cardioversion. This syndrome can be congenital or acquired, particularly after surgical correction for heart defects.
  • A constellation of signs and symptoms which may include syncope, fatigue, dizziness, and alternating periods of bradycardia and atrial tachycardia, which is caused by sinoatrial node dysfunction.
  • A disorder characterized by a dysrhythmia with alternating periods of bradycardia and atrial tachycardia accompanied by syncope, fatigue and dizziness.
ICD-10-CM I49.5 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 I49.5 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

Diagnosis Index entries containing back-references to I49.5:
  • Bradycardia (sinoatrial) (sinus) (vagal) R00.1
    ICD-10-CM Diagnosis Code R00.1

    Bradycardia, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Sinoatrial bradycardia
    • Sinus bradycardia
    • Slow heart beat
    • Vagal bradycardia
    Type 1 Excludes
    Use Additional
    • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
    • tachycardia syndrome I49.5
  • Bradytachycardia I49.5
  • Dysfunction
    • sinoatrial node I49.5
  • Pause, sinoatrial I49.5
  • Sick R69
    ICD-10-CM Diagnosis Code R69

    Illness, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Unknown and unspecified cases of morbidity
    • sinus I49.5 (syndrome)
  • Syndrome - see also Disease
    • sick
      • sinus I49.5
    • bradycardia-tachycardia I49.5
    • tachycardia-bradycardia I49.5
  • Tachycardia R00.0
    ICD-10-CM Diagnosis Code R00.0

    Tachycardia, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    Applicable To
    • Rapid heart beat
    • Sinoauricular tachycardia NOS
    • Sinus [sinusal] tachycardia NOS
    Type 1 Excludes
    • neonatal tachycardia (P29.11)
    • paroxysmal tachycardia (I47.-)
    • paroxysmal (sustained) (nonsustained) I47.9
      ICD-10-CM Diagnosis Code I47.9

      Paroxysmal tachycardia, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Bouveret (-Hoffman) syndrome
      • with sinus bradycardia I49.5
    • sick sinus I49.5

ICD-10-CM Codes Adjacent To I49.5
I49 Other cardiac arrhythmias
I49.0 Ventricular fibrillation and flutter
I49.01 Ventricular fibrillation
I49.02 Ventricular flutter
I49.1 Atrial premature depolarization
I49.2 Junctional premature depolarization
I49.3 Ventricular premature depolarization
I49.4 Other and unspecified premature depolarization
I49.40 Unspecified premature depolarization
I49.49 Other premature depolarization
I49.5 Sick sinus syndrome
I49.8 Other specified cardiac arrhythmias
I49.9 Cardiac arrhythmia, unspecified
I50 Heart failure
I50.1 Left ventricular failure, unspecified
I50.2 Systolic (congestive) heart failure
I50.20 Unspecified systolic (congestive) heart failure
I50.21 Acute systolic (congestive) heart failure
I50.22 Chronic systolic (congestive) heart failure
I50.23 Acute on chronic systolic (congestive) heart failure
I50.3 Diastolic (congestive) heart failure

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