Skip to content
Dx

ICD-10-CM 2027 diagnosis code

I45.8Other specified conduction disorders

Not billable — use a more specific code

I45.8 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I45.8

I45.8 is the ICD-10-CM diagnosis code for other specified conduction disorders. It belongs to category I45 (other conduction disorders), 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 2 subcodes must be used instead.

Within I45, choose I45.8 (Other specified conduction disorders) only when documentation doesn't support a more specific option: right fascicular block (I45.0), other and unspecified right bundle-branch block (I45.1), Bifascicular block (I45.2), Trifascicular block (I45.3), nonspecific intraventricular block (I45.4), other specified heart block (I45.5), Pre-excitation syndrome (I45.6) and conduction disorder, unspecified (I45.9).

To report this condition, pick the subcode that matches the documentation: I45.81 (syndrome) and I45.89 (disorders).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under I45.8

Notes that apply from higher levels

Instructions written at a parent level also apply to I45.8.

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

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)
  • No changes since FY2016.

Common questions about I45.8

Is I45.8 billable?

No. I45.8 is a header code. Report one of its more specific subcodes instead.