DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

I48 Atrial fibrillation and flutter

  • Header · not billable

I48 is not billable. The category heads 9 billable codes in FY2027, grouped under 6 subdivisions.

ICD-10 code by name

What is the ICD-10 code for AFib (atrial fibrillation)?
AFib ICD-10 code: I48.91 Unspecified atrial fibrillation. Alphabetic Index: Fibrillationatrial or auricular (established) → I48.91. AFib: atrial fibrillation, per MedlinePlus; the NCHS files do not use AFib. Search ICD-10 for AFib
What is the ICD-10 code for atrial fibrillation?
Atrial fibrillation ICD-10 code: I48.91 Unspecified atrial fibrillation. Alphabetic Index: Fibrillationatrial or auricular (established) → I48.91. Search ICD-10 for atrial fibrillation
What is the ICD-10 code for paroxysmal atrial fibrillation?
Paroxysmal atrial fibrillation ICD-10 code: I48.0 Paroxysmal atrial fibrillation. Search ICD-10 for paroxysmal atrial fibrillation
What is the ICD-10 code for paroxysmal AFib (paroxysmal atrial fibrillation)?
Paroxysmal AFib ICD-10 code: I48.0 Paroxysmal atrial fibrillation. AFib: atrial fibrillation, per MedlinePlus; the NCHS files do not use AFib. Search ICD-10 for paroxysmal AFib
What is the ICD-10 code for persistent atrial fibrillation?
Persistent atrial fibrillation ICD-10 code: I48.19 Other persistent atrial fibrillation. Alphabetic Index: Fibrillationatrial or auricular (established)persistent (chronic) (NOS) (other) → I48.19. Search ICD-10 for persistent atrial fibrillation
What is the ICD-10 code for chronic atrial fibrillation, unspecified?
Chronic atrial fibrillation ICD-10 code: I48.20 Chronic atrial fibrillation, unspecified. Search ICD-10 for chronic atrial fibrillation
What is the ICD-10 code for permanent atrial fibrillation?
Permanent atrial fibrillation ICD-10 code: I48.21 Permanent atrial fibrillation. Search ICD-10 for permanent atrial fibrillation
What is the ICD-10 code for longstanding persistent atrial fibrillation?
Longstanding persistent atrial fibrillation ICD-10 code: I48.11 Longstanding persistent atrial fibrillation. Search ICD-10 for longstanding persistent atrial fibrillation

Where it sits

  1. Chapter 9 Diseases of the circulatory system (I00-I99)
  2. I30-I5A Other forms of heart disease (I30-I5A)
  3. I48 Atrial fibrillation and flutter
Billable codes
9
Subdivisions
6
CC / MCC codes
7 / 0
HCC V28 codes
9
New FY2027
0
Index entries
15

Codes in I48

  1. I48.0
    Paroxysmal atrial fibrillation
    Billable238
  2. I48.1
    Persistent atrial fibrillation
    Header
    Excludes1 1

    Excludes1

    • Permanent atrial fibrillation (I48.21) I48.21
  3. I48.11
    Longstanding persistent atrial fibrillation
    BillableCC238
  4. I48.19
    Other persistent atrial fibrillation
    BillableCC238
    Inclusion terms 2

    Inclusion terms

    • Chronic persistent atrial fibrillation
    • Persistent atrial fibrillation, NOS
  5. I48.2
    Chronic atrial fibrillation
    Header
  6. I48.20
    Chronic atrial fibrillation, unspecified
    BillableCC238
    Excludes1 1

    Excludes1

    • Chronic persistent atrial fibrillation (I48.19) I48.19
  7. I48.21
    Permanent atrial fibrillation
    BillableCC238
  8. I48.3
    Typical atrial flutter
    BillableCC238
    Inclusion terms 1

    Inclusion terms

    • Type I atrial flutter
  9. I48.4
    Atypical atrial flutter
    BillableCC238
    Inclusion terms 1

    Inclusion terms

    • Type II atrial flutter
  10. I48.9
    Unspecified atrial fibrillation and atrial flutter
    Header
  11. I48.91
    Unspecified atrial fibrillation
    Billable238
  12. I48.92
    Unspecified atrial flutter 1 billable code
    BillableCC238

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

  • Fibrillationatrial or auricular (established) → I48.91
  • Fibrillationatrial or auricular (established)paroxysmal → I48.0
  • Fibrillationatrial or auricular (established)persistent (chronic) (NOS) (other) → I48.19
  • Fibrillationatrial or auricular (established)chronic → I48.20
  • Fibrillationatrial or auricular (established)permanent → I48.21
  • Flutteratrial or auriculartype I → I48.3
  • Flutteratrial or auriculartypical → I48.3
  • Flutteratrial or auricularatypical → I48.4
  • Flutteratrial or auriculartype II → I48.4
  • Fibrillationatrial or auricular (established)persistent (chronic) (NOS) (other)longstanding → I48.11
  • Fibrillationatrial or auricular (established)chronicpersistent → I48.19
  • Flutterheartatrial or auriculartype I → I48.3
  • Flutterheartatrial or auriculartypical → I48.3
  • Flutterheartatrial or auricularatypical → I48.4
  • Flutterheartatrial or auriculartype II → I48.4

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

Hierarchy