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ICD-10-CM 2027 diagnosis code

I49.8Other specified cardiac arrhythmias

Not billable — use a more specific code

I49.8 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code last changed in FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I49.8

I49.8 is the ICD-10-CM diagnosis code for other specified cardiac arrhythmias. It belongs to category I49 (other cardiac arrhythmias), block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within I49, choose I49.8 (Other specified cardiac arrhythmias) only when documentation doesn't support a more specific option: ventricular fibrillation and flutter (I49.0), atrial premature depolarization (I49.1), junctional premature depolarization (I49.2), ventricular premature depolarization (I49.3), other and unspecified premature depolarization (I49.4), sick sinus syndrome (I49.5) and cardiac arrhythmia, unspecified (I49.9).

To report this condition, pick the subcode that matches the documentation: I49.81 (syndrome), I49.82 (bigeminy) and I49.89 (not elsewhere classified).

Code first cardiac arrhythmia complicating: abortion or ectopic or molar pregnancy (O00-O07, O08.8) and obstetric surgery and procedures (O75.4).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2027 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 427.89 (other specified cardiac dysrhythmias).

Specific codes under I49.8

Notes that apply from higher levels

Instructions written at a parent level also apply to I49.8.

› From I49 Other cardiac arrhythmias
Excludes2
  • bradycardia NOS (R00.1)
  • neonatal dysrhythmia (P29.1-)
  • sinoatrial bradycardia (R00.1)
  • sinus bradycardia (R00.1)
  • vagal bradycardia (R00.1)
Code first
  • cardiac arrhythmia complicating:
  • abortion or ectopic or molar pregnancy (O00-O07, O08.8)
  • obstetric surgery and procedures (O75.4)

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

ICD-9-CM equivalent

Converter →
  • 427.89Other specified cardiac dysrhythmiasapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2027 (effective 10/1/2026): Expanded — no longer billable

Common questions about I49.8

Is I49.8 billable?

No. I49.8 is a header code. Report one of its more specific subcodes instead.

What is the ICD-9 code for I49.8?

The CMS General Equivalence Mappings map I49.8 to ICD-9-CM 427.89.

Did I49.8 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was expanded into more specific subcodes, so it is no longer billable.