ICD-10-CM 2027 diagnosis code

R56Convulsions, not elsewhere classified

Not billable — use a more specific code

R56 is a header code, so it can't be reported by itself. Choose one of the 3 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 R56

R56 is the ICD-10-CM diagnosis code for convulsions, not elsewhere classified. It belongs to block R50-R69 (general symptoms and signs) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: R56.0 (convulsions), R56.1 (seizures) and R56.9 (convulsions).

Don't report R56 together with the conditions in its Excludes1 note: dissociative convulsions and seizures (F44.5), epileptic convulsions and seizures (G40.-) and newborn convulsions and seizures (P90).

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 R56

Coding notes

Excludes1Not coded here — never report together with this code

dissociative convulsions and seizures (F44.5)
epileptic convulsions and seizures (G40.-)
newborn convulsions and seizures (P90)

Notes that apply from higher levels

Instructions written at a parent level also apply to R56.

Broader instructions also apply from Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about R56

Is R56 billable?: No. R56 is a header code. Report one of its more specific subcodes instead.