I49.9 ICD-10-CA code: Cardiac arrhythmia, unspecified
I49.9 is the ICD-10-CA code for “Cardiac arrhythmia, unspecified” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
I49.9Cardiac arrhythmia, unspecified
Short description: Cardiac arrhythmia unspecified
ICD-10-CA · Canada · Also written I499
Index terms
Entries in CIHI’s alphabetical index that lead to I49.9. Searching the index by the condition the note names is how coders reach this code.
- Rhythm, escape
- Rhythm, disorder
- Arrhythmia (cardiac)
- Dysrhythmia, cardiac
- Action, heart, disorder
- Rhythm, heart, abnormal
- Action, heart, irregular
- Disturbance, rhythm, heart
- Disorder (of), heart action
- Syndrome, sudden death, arrhythmic
- Irregular, irregularity, action, heart
- Abnormal, abnormality, abnormalities, rhythm, heart
Notes for I49.9
As CIHI prints them, with any note I49.9 takes from the headings above it.
Includes
- Arrhythmia (cardiac) NOS
Excludes
Conditions classified elsewhere.
- Bradycardia:• NOS (R00.1)• sinoatrial NOS (R00.1)• sinus (R00.1)• vagal (R00.1)complicating:• abortion or ectopic or molar pregnancy (O00-O07) (O08.8)• obstetric surgery and procedures (O75.4)neonatal cardiac dysrhythmia (P29.18)From I49 Other cardiac arrhythmias
- 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 I49.9 sits
- 1ChapterChapter 9: Diseases of the circulatory system (I00-I99)
- 2Block I30-I52Other forms of heart disease
- 3Category I49Other cardiac arrhythmias
- 4Valid code I49.9Cardiac arrhythmia, 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 I49.9 mean?
I49.9 is the ICD-10-CA code for “Cardiac arrhythmia, unspecified” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is I49.9 in ICD-10-CA?
I49.9 sits under I49 Other cardiac arrhythmias, within I30-I52 Other forms of heart disease, within Chapter 9: Diseases of the circulatory system (I00-I99).
What coding notes apply to I49.9?
ICD-10-CA lists Includes, Excludes notes for I49.9, 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.