I48 ICD-10-CA category: Atrial fibrillation and flutter

I48 isn’t a code on its own. Choose one of the 7 codes beneath it, the one the documentation supports.

Official description

I48

Atrial fibrillation and flutter

ICD-10-CA · Canada

Codes in I48

I48 isn’t a code on its own. Open the group that matches what the note documents.

I48.0Atrial fibrillation (3 codes)I48.3Typical atrial flutter I48.4Atypical atrial flutter I48.9Atrial fibrillation and atrial flutter, unspecified (2 codes)

Notes for I48

As CIHI prints them, with any note I48 takes from the headings above it.

Excludes

Conditions classified elsewhere.

Certain:• conditions originating in the perinatal period (P00-P96)• infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)systemic connective tissue disorders (M30-M36)transient cerebral ischaemic attacks and related syndromes (G45.-)From Chapter 9: Diseases of the circulatory system (I00-I99)

Where I48 sits

1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
2Block I30-I52Other forms of heart disease
3Category I48Atrial fibrillation and flutter

Source and release

Data release: ICD-10-CA · FY 2026–2027
Effective date: Apr 1, 2026
Publisher: CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See I48 in the CIHI source

Frequently asked questions

Is I48 a valid ICD-10-CA code?

No. I48 (Atrial fibrillation and flutter) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 7 codes; record the one the documentation supports.

Where is I48 in ICD-10-CA?

I48 sits under I30-I52 Other forms of heart disease, within Chapter 9: Diseases of the circulatory system (I00-I99).

What coding notes apply to I48?

ICD-10-CA lists Excludes notes for I48, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.