2025 ICD-10-CM Diagnosis Code I48.4

Atypical atrial flutter

• I48.4 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2025 edition of ICD-10-CM I48.4 became effective on October 1, 2024.
• This is the American ICD-10-CM version of I48.4 – other international versions of ICD-10 I48.4 may differ.

Applicable To

• Type II atrial flutter

The following code(s) above I48.4 contain annotation back-references

 that may be applicable to I48.4:

• I00-I99  Diseases of the circulatory system

ICD-10-CM I48.4 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

• 308 Cardiac arrhythmia and conduction disorders with mcc
• 309 Cardiac arrhythmia and conduction disorders with cc
• 310 Cardiac arrhythmia and conduction disorders without cc/mcc
• 791 Prematurity with major problems
• 793 Full term neonate with major problems

Convert I48.4 to ICD-9-CMCode History

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change
• 2024 (effective 10/1/2023): No change
• 2025 (effective 10/1/2024): No change

Diagnosis Index entries containing back-references to I48.4:

• Flutter
  • atrial or auricularI48.92
    • atypical I48.4
    • type II I48.4
  • heartI49.8
    • atrial or auricularI48.92
      • atypical I48.4
      • type II I48.4