2020 ICD-10-CM Diagnosis Code I46.8

Cardiac arrest due to other underlying condition

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I46.8 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 I46.8 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I46.8 - other international versions of ICD-10 I46.8 may differ.
Code First
Code First Help
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases the manifestation codes will have in the code title, "in diseases classified elsewhere." Codes with this title are a component of the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principle diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.
  • underlying condition
The following code(s) above I46.8 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 I46.8:
  • 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
  • I46
    ICD-10-CM Diagnosis Code I46

    Cardiac arrest

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 1 Excludes
    • cardiogenic shock (R57.0)
    Cardiac arrest
ICD-10-CM I46.8 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 296 Cardiac arrest, unexplained with mcc
  • 297 Cardiac arrest, unexplained with cc
  • 298 Cardiac arrest, unexplained without cc/mcc
  • 791 Prematurity with major problems
  • 793 Full term neonate with major problems

Convert I46.8 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 I46.8:
  • Arrest, arrested
    • cardiac I46.9
      ICD-10-CM Diagnosis Code I46.9

      Cardiac arrest, cause unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      • due to
        • specified condition NEC I46.8

ICD-10-CM Codes Adjacent To I46.8
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
I48.0 Paroxysmal atrial fibrillation
I48.1 Persistent atrial fibrillation
I48.11 Longstanding persistent atrial fibrillation

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