DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I45 Other conduction disorders

  • Header · not billable

I45 is not billable. The category heads 11 billable codes in FY2027, grouped under 9 subdivisions.

Index → code

  • Dropped heart beats → I45.9
  • Arborization block (heart) → I45.5
  • Lown-Ganong-Levine syndrome → I45.6

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I45 Other conduction disorders
Billable codes
11
Subdivisions
9
CC / MCC codes
3 / 0
HCC V28 codes
0
New FY2027
0
Index entries
67

Codes in I45

  1. I45.0
    Right fascicular block
    Billable
  2. I45.1
    Other and unspecified right bundle-branch block
    Header
  3. I45.10
    Unspecified right bundle-branch block
    Billable
    Inclusion terms 1

    Inclusion terms

    • Right bundle-branch block NOS
  4. I45.19
    Other right bundle-branch block
    Billable
  5. I45.2
    Bifascicular block
    BillableCC
  6. I45.3
    Trifascicular block
    BillableCC
  7. I45.4
    Nonspecific intraventricular block
    Billable
    Inclusion terms 1

    Inclusion terms

    • Bundle-branch block NOS
  8. I45.5
    Other specified heart block
    Billable
    Inclusion terms 2, Excludes1 1

    Inclusion terms

    • Sinoatrial block
    • Sinoauricular block

    Excludes1

    • heart block NOS (I45.9) I45.9
  9. I45.6
    Pre-excitation syndrome
    Billable
    Inclusion terms 6

    Inclusion terms

    • Accelerated atrioventricular conduction
    • Accessory atrioventricular conduction
    • Anomalous atrioventricular excitation
    • Lown-Ganong-Levine syndrome
    • Pre-excitation atrioventricular conduction
    • Wolff-Parkinson-White syndrome
  10. I45.8
    Other specified conduction disorders
    Header
  11. I45.81
    Long QT syndrome
    Billable
  12. I45.89
    Other specified conduction disorders
    BillableCC
    Inclusion terms 4

    Inclusion terms

    • Atrioventricular [AV] dissociation
    • Interference dissociation
    • Isorhythmic dissociation
    • Nonparoxysmal AV nodal tachycardia
  13. I45.9
    Conduction disorder, unspecified
    Billable
    Inclusion terms 2

    Inclusion terms

    • Heart block NOS
    • Stokes-Adams syndrome

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).

Sources of each column.

Instructions

Notes that also apply

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

Index entries

  • Arborization block (heart) → I45.5
  • Accelerated atrioventricular conduction → I45.6
  • Lown-Ganong-Levine syndrome → I45.6
  • Pre-excitation atrioventricular conduction → I45.6
  • Wolff-Parkinson-White syndrome → I45.6
  • Jervell-Lange-Nielsen syndrome → I45.81
  • Romano-Ward (prolonged QT interval) syndrome → I45.81
  • Adams-Stokes (-Morgagni) disease or syndrome → I45.9
  • Dropped heart beats → I45.9
  • Morgagni-Stokes-Adams syndrome → I45.9
  • Spens' syndrome (syncope with heart block) → I45.9
  • Stokes-Adams disease or syndrome → I45.9
  • Block, blockedbifascicular (cardiac) → I45.2
  • Block, blockedtrifascicular → I45.3
  • Block, blockedbundle-branch (complete) (false) (incomplete) → I45.4
  • Block, blockedintraventricular (nonspecific) → I45.4
  • Arrest, arrestedsinus → I45.5
  • Block, blockedarborization (heart) → I45.5
  • Block, blockednodal → I45.5
  • Block, blockedsinoatrial → I45.5
  • Block, blockedsinoauricular → I45.5
  • Sinusarrest → I45.5
  • Sinuspause → I45.5
  • Standstillauricular → I45.5
  • Standstillsinoatrial → I45.5
  • Accessory (congenital)atrioventricular conduction → I45.6
  • Excitationanomalous atrioventricular → I45.6
  • LongQT syndrome → I45.81
  • SyndromeJervell-Lange-Nielsen → I45.81
  • Syndromelong QT → I45.81
  • SyndromeQT interval prolongation → I45.81
  • SyndromeRomano-Ward (prolonged QT interval) → I45.81
  • Dissociationauriculoventricular or atrioventricular (AV) (any degree) (isorhythmic) → I45.89
  • Dissociationinterference → I45.89
  • Incompetency, incompetent, incompetencechronotropic → I45.89
  • Tachycardianon-paroxysmal AV nodal → I45.89
  • Arrhythmia (auricle)(cardiac)(juvenile)(nodal)(reflex)(supraventricular)(transitory)(ventricle)block → I45.9
  • Attack, attacksAdams-Stokes → I45.9
  • Attack, attacksStokes-Adams → I45.9
  • Block, blockedarrhythmic → I45.9

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

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

Hierarchy