DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I49 Other cardiac arrhythmias

  • Header · not billable

I49 is not billable. The category heads 12 billable codes in FY2027, grouped under 8 subdivisions.

FY2027 changes under I49: 3 billable codes added; I49.8 no longer billable (now a header). All FY2027 changes.

Index → code

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I49 Other cardiac arrhythmias
Billable codes
12
Subdivisions
8
CC / MCC codes
1 / 2
HCC V28 codes
4
New FY2027
3
Index entries
82

Codes in I49

  1. I49.0
    Ventricular fibrillation and flutter
    Header
  2. I49.01
    Ventricular fibrillation
    BillableMCC†213
  3. I49.02
    Ventricular flutter
    BillableMCC213
  4. I49.1
    Atrial premature depolarization
    Billable
    Inclusion terms 1

    Inclusion terms

    • Atrial premature beats
  5. I49.2
    Junctional premature depolarization
    BillableCC238
  6. I49.3
    Ventricular premature depolarization
    Billable
  7. I49.4
    Other and unspecified premature depolarization
    Header
  8. I49.40
    Unspecified premature depolarization
    Billable
    Inclusion terms 1

    Inclusion terms

    • Premature beats NOS
  9. I49.49
    Other premature depolarization
    Billable
    Inclusion terms 4

    Inclusion terms

    • Ectopic beats
    • Extrasystoles
    • Extrasystolic arrhythmias
    • Premature contractions
  10. I49.5
    Sick sinus syndrome
    Billable238
    Inclusion terms 1

    Inclusion terms

    • Tachycardia-bradycardia syndrome
  11. I49.8
    Other specified cardiac arrhythmias Not billable since FY2027
    Header
  12. I49.81
    Brugada syndrome New FY2027
    Billable
  13. I49.82
    Ventricular bigeminy New FY2027
    Billable
    Use additional code 3

    Use additional code

    • code, if applicable, for associated symptoms such as:
    • dizziness (R42) R42
    • syncope (R55) R55
  14. I49.89
    Other specified cardiac arrhythmias not elsewhere classified New FY2027
    Billable
    Inclusion terms 3

    Inclusion terms

    • Coronary sinus rhythm disorder
    • Ectopic rhythm disorder
    • Nodal rhythm disorder
  15. I49.9
    Cardiac arrhythmia, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Arrhythmia (cardiac) NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card). † MCC only if the patient is discharged alive; otherwise neither CC nor MCC (Appendix C Part 2).

Sources of each column.

Instructions

At I49

Excludes2

  • bradycardia NOS (R00.1) R00.1
  • neonatal dysrhythmia (P29.1-) P29.1
  • sinoatrial bradycardia (R00.1) R00.1
  • sinus bradycardia (R00.1) R00.1
  • vagal bradycardia (R00.1) R00.1

Code first

  • cardiac arrhythmia complicating:
  • abortion or ectopic or molar pregnancy (O00-O07, O08.8) O00 O07 O08.8
  • obstetric surgery and procedures (O75.4) O75.4

Notes that also apply

Chapter 9 instructions (Excludes2 10): printed on the chapter 9 page.

Index entries

  • Depolarization, premature → I49.40
  • Extrasystoles (supraventricular) → I49.49
  • Bradytachycardia → I49.5
  • Pause, sinoatrial → I49.5
  • Bigeminy, ventricular → I49.82
  • Bradyarrhythmia, cardiac → I49.89
  • Nodal rhythm → I49.89
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle) → I49.9
  • Fibrillationventricular → I49.01
  • Flutterventricular → I49.02
  • Beat(s)atrial, premature → I49.1
  • Depolarization, prematureatrial → I49.1
  • Ectopic, ectopia (congenital)atrial beats → I49.1
  • Extrasystoles (supraventricular)atrial → I49.1
  • Extrasystoles (supraventricular)auricular → I49.1
  • Depolarization, prematurejunctional → I49.2
  • Extrasystoles (supraventricular)junctional → I49.2
  • Depolarization, prematureventricular → I49.3
  • Ectopic, ectopia (congenital)ventricular beats → I49.3
  • Extrasystoles (supraventricular)ventricular → I49.3
  • Prematureventricular systole → I49.3
  • Ventricle, ventricularescape → I49.3
  • Beat(s)premature → I49.40
  • Prematurebeats → I49.40
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)extrasystolic → I49.49
  • Beat(s)ectopic → I49.49
  • Beat(s)escaped, heart → I49.49
  • Depolarization, prematurespecified NEC → I49.49
  • Ectopic, ectopia (congenital)beats → I49.49
  • Bradycardia (sinoatrial) (sinus) (vagal)tachycardia syndrome → I49.5
  • Dysfunctionsinoatrial node → I49.5
  • Sicksinus (syndrome) → I49.5
  • Syndromebradycardia-tachycardia → I49.5
  • Syndrometachycardia-bradycardia → I49.5
  • Tachycardiasick sinus → I49.5
  • SyndromeBrugada → I49.81
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)sinus → I49.89
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)specified NEC → I49.89
  • Fibrillationcardiac → I49.89
  • Fibrillationheart → I49.89

42 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy