I48.4

✓ Billable

Atypical atrial flutter

Diseases of the circulatory system (I00-I99)

Also Known As

Type II atrial flutter

✅ No additional coding notes for I48.4

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Code Information

CodeI48.4

BillableYes

ParentI48

CategoryDiseases of the circulatory system (I00-I99)

Excludes10 rule(s)

Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)