2020 ICD-10-CM Diagnosis Code I44.1

Atrioventricular block, second degree

    2016 2017 2018 2019 2020 Billable/Specific Code
  • I44.1 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 I44.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of I44.1 - other international versions of ICD-10 I44.1 may differ.
Applicable To
  • Atrioventricular block, type I and II
  • Möbitz block, type I and II
  • Second degree block, type I and II
  • Wenckebach's block
The following code(s) above I44.1 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 I44.1:
  • 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
  • Atrioventricular block, high degree
  • Atrioventricular block, high degree (heart rhythm condition)
  • Atrioventricular block, incomplete, mobitz type 1
  • Atrioventricular block, mobitz type 2
  • High degree second degree atrioventricular block
  • Mobitz type i incomplete atrioventricular block
  • Mobitz type ii atrioventricular block
  • Second degree atrioventricular block
Clinical Information
  • A cardiac rhythm characterized by intermittent failure of atrial electrical impulse conduction through the atrioventricular (av) node to the ventricles. This includes mobitz i and mobitz ii.
  • A cardiac rhythm characterized by progressive pr prolongation and shortening of rr interval until p wave is blocked. The pause after the blocked p wave is less than twice the pp interval. The pr following block is shorter than the pr immediately preceding block.
  • A disorder characterized by a dysrhythmia with a progressively lengthening pr interval prior to the blocking of an atrial impulse. This is the result of intermittent failure of atrial electrical impulse conduction through the atrioventricular (av) node to the ventricles.
  • Intermittent failure of atrial electrical impulse conduction through the atrioventricular (av) node to the ventricles, characterized by a progressively lengthening pr interval prior to the block of an atrial impulse.
  • Intermittent failure of atrial electrical impulse conduction through the atrioventricular (av) node to the ventricles.
ICD-10-CM I44.1 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 I44.1 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 I44.1:
  • Block, blocked
    • atrioventricular (incomplete) (partial) I44.30
      ICD-10-CM Diagnosis Code I44.30

      Unspecified atrioventricular block

        2016 2017 2018 2019 2020 Billable/Specific Code
      • second degree I44.1 (types I and II)
      • types I and II I44.1
    • heart I45.9
      ICD-10-CM Diagnosis Code I45.9

      Conduction disorder, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Heart block NOS
      • Stokes-Adams syndrome
      • second degree I44.1 (atrioventricular)
    • Mobitz I44.1 (types I and II)
    • second degree I44.1 (types I and II)
    • Wenckebach I44.1 (types I and II)
  • Mobitz heart block I44.1 (atrioventricular)
  • Phenomenon
    • Wenckebach's I44.1
  • Wenckebach's block or phenomenon I44.1

ICD-10-CM Codes Adjacent To I44.1
I42.3 Endomyocardial (eosinophilic) disease
I42.4 Endocardial fibroelastosis
I42.5 Other restrictive cardiomyopathy
I42.6 Alcoholic cardiomyopathy
I42.7 Cardiomyopathy due to drug and external agent
I42.8 Other cardiomyopathies
I42.9 Cardiomyopathy, unspecified
I43 Cardiomyopathy in diseases classified elsewhere
I44 Atrioventricular and left bundle-branch block
I44.0 Atrioventricular block, first degree
I44.1 Atrioventricular block, second degree
I44.2 Atrioventricular block, complete
I44.3 Other and unspecified atrioventricular block
I44.30 Unspecified atrioventricular block
I44.39 Other atrioventricular block
I44.4 Left anterior fascicular block
I44.5 Left posterior fascicular block
I44.6 Other and unspecified fascicular block
I44.60 Unspecified fascicular block
I44.69 Other fascicular block
I44.7 Left bundle-branch block, unspecified

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