I48.90 ICD-10-CA code: Atrial fibrillation, unspecified
I48.90 is the ICD-10-CA code for “Atrial fibrillation, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
I48.90Atrial fibrillation, unspecified
Short description: Atrial fib unspec
ICD-10-CA · Canada · Also written I4890
Index terms
Entries in CIHI’s alphabetical index that lead to I48.90. Searching the index by the condition the note names is how coders reach this code.
- Fibrillation, atrial or auricular (established)
Notes for I48.90
As CIHI prints them, with any note I48.90 takes from the headings above it.
Includes
- Atrial fibrillation NOS
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 I48.90 sits
- 1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
- 2Block I30-I52Other forms of heart disease
- 3Category I48Atrial fibrillation and flutter
- 4Subcategory I48.9Atrial fibrillation and atrial flutter, unspecified
- 5Valid code I48.90Atrial fibrillation, unspecified
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.
Frequently asked questions
What does ICD-10-CA code I48.90 mean?
I48.90 is the ICD-10-CA code for “Atrial fibrillation, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is I48.90 in ICD-10-CA?
I48.90 sits under I48.9 Atrial fibrillation and atrial flutter, unspecified, within I48 Atrial fibrillation and flutter, within I30-I52 Other forms of heart disease, within Chapter 9: Diseases of the circulatory system (I00-I99).
What coding notes apply to I48.90?
ICD-10-CA lists Includes, Excludes notes for I48.90, 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.