2027 ICD-10-CM Diagnosis Code R00Abnormalities of heart beat

ICD-10-CM Codes›R00–R99›R00-R09›R00

ICD-10-CM R00
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

R00 is a non-billable ICD-10-CM category code for abnormalities of heart beat, so it cannot be submitted on claims. Use a more specific code from this category instead, such as R00.0, R00.1, R00.2, and R00.8. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such abnormalities of heart rhythm.

Code Identity

ICD-10-CM Code
R00
Billable Status
No — Non-Billable Category
Code Describes
Abnormalities of heart beat
Short Description
Abnormalities of heart beat
Same as the full description in the CMS dataset.
Chapter
R00-R09
Symptoms and signs involving the circulatory and respiratory systems

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR00-R09Symptoms and signs involving the circulatory and respiratory systems
CategoryR00Abnormalities of heart beat
This CodeR00Abnormalities of heart beat

Specific Coding for Abnormalities of heart beatOverview

Non-specific codes like R00 require more characters. Use one of these billable codes instead:

  • Use R00.0 for Tachycardia, unspecified

  • Use R00.1 for Bradycardia, unspecified

  • Use R00.2 for Palpitations

  • Use R00.8 for Other abnormalities of heart beat

  • Use R00.9 for Unspecified abnormalities of heart beat

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to R00: its own notes plus those printed at Chapter 18. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On R00 itself
  • specified arrhythmias (I47-I49)
From Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified applies to 774 codes
  • abnormal findings on antenatal screening of mother (O28.-)
  • certain conditions originating in the perinatal period (P04-P96)
  • signs and symptoms classified in the body system chapters
  • signs and symptoms of breast (N63, N64.5)

Notes

General instructions on how these codes are used.

From Chapter 18 (R00-R99) Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified applies to 774 codes
  • This chapter includes symptoms, signs, abnormal results of clinical or other investigative procedures, and ill-defined conditions regarding which no diagnosis classifiable elsewhere is recorded.
  • Signs and symptoms that point rather definitely to a given diagnosis have been assigned to a category in other chapters of the classification. In general, categories in this chapter include the less well-defined conditions and symptoms that, without the necessary study of the case to establish a final diagnosis, point perhaps equally to two or more diseases or to two or more systems of the body. Practically all categories in the chapter could be designated 'not otherwise specified', 'unknown etiology' or 'transient'. The Alphabetical Index should be consulted to determine which symptoms and signs are to be allocated here and which to other chapters. The residual subcategories, numbered .8, are generally provided for other relevant symptoms that cannot be allocated elsewhere in the classification.
  • The conditions and signs or symptoms included in categories R00-R94 consist of:
  • (a) cases for which no more specific diagnosis can be made even after all the facts bearing on the case have been investigated;
  • (b) signs or symptoms existing at the time of initial encounter that proved to be transient and whose causes could not be determined;
  • (c) provisional diagnosis in a patient who failed to return for further investigation or care;
  • (d) cases referred elsewhere for investigation or treatment before the diagnosis was made;
  • (e) cases in which a more precise diagnosis was not available for any other reason;
  • (f) certain symptoms, for which supplementary information is provided, that represent important problems in medical care in their own right.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Patient EducationClinical

Arrhythmia

An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart beats too quickly, too slowly, or with an irregular pattern. Changes in the electrical signals that control your heartbeat cause arrhythmias.

The full article covers:

  • What is an arrhythmia?
  • What causes an arrhythmia?
  • What are the symptoms of an arrhythmia?
  • How is an arrhythmia diagnosed?
  • What are the treatments for an arrhythmia?
  • Can arrhythmias be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About R00Overview

What is the ICD-10 code for abnormalities of heart beat?

R00 is the ICD-10-CM category for abnormalities of heart beat, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is R00 (Abnormalities of heart beat) a billable code?

No. This is a category header that groups the codes for abnormalities of heart beat, and headers cannot be submitted on claims. Claims for abnormalities of heart beat need a more specific code from this category, such as R00.0, R00.1, and R00.2.

Can R00 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the abnormalities of heart beat is established, that condition takes the principal position instead.

Can R00 be reported with a code from P29.1?

Not as a rule. The Excludes1 note on R00 lists "abnormalities originating in the perinatal period (P29.1-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).