ICD-10-CM 2027 diagnosis code

R00Abnormalities of heart beat

Not billable — use a more specific code

R00 is a header code, so it can't be reported by itself. Choose one of the 5 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 R00

R00 is the ICD-10-CM diagnosis code for abnormalities of heart beat. It belongs to block R00-R09 (symptoms and signs involving the circulatory and respiratory systems) 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 5 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: R00.0 (unspecified), R00.1 (unspecified), R00.2 (Palpitations), R00.8 (beat) and R00.9 (beat).

Don't report R00 together with the conditions in its Excludes1 note: abnormalities originating in the perinatal period (P29.1-).

The conditions in its Excludes2 note aren't part of R00, but may be coded alongside it if the patient has both: specified arrhythmias (I47-I49).

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 R00

Coding notes

Excludes1Not coded here — never report together with this code

abnormalities originating in the perinatal period (P29.1-)

Excludes2Not included here — may be reported together if both conditions exist

specified arrhythmias (I47-I49)

Notes that apply from higher levels

Instructions written at a parent level also apply to R00.

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 R00

Is R00 billable?: No. R00 is a header code. Report one of its more specific subcodes instead.