2027 ICD-10-CM Diagnosis Code R00.0Tachycardia, unspecified
ICD-10-CM Codes›R00–R99›R00-R09›R00
- Billable — Valid for Submission
- Not Chronic
R00.0 is a billable ICD-10-CM diagnosis code for tachycardia, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 308 through 310, 791, 793. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Circulatory signs and symptoms.
This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such abnormalities of heart rhythm.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormal pulse rate
- Borderline fast pulse
- Cardiac pacemaker re-entrant tachycardia
- Finding of pulse rate
- Irregular tachycardia
- Pacemaker mediated tachycardia
- Persistent tachycardia during pregnancy
- Pulse fast
- QRS complex - finding
- Reflex tachycardia
- Regular wide QRS complex tachycardia
- Sinoatrial node tachycardia
- Sinus tachycardia
- Stable tachyarrhythmia
- Tachyarrhythmia
- Tachycardia
- Tachycardia-induced cardiomyopathy
- Wide QRS complex
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to R00.0: its own notes plus those printed at R00 and Chapter 18. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Rapid heart beat
- Sinoauricular tachycardia NOS
- Sinus [sinusal] tachycardia NOS
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
Notes
General instructions on how these codes are used.
- 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.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name R00.0, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming R00.0: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Fast pulse R00.0
rapid R00.0
heart (beat) R00.0
Sinus See Also: Fistula;
tachycardia R00.0
Tachycardia R00.0
sinoauricular NOS R00.0
sinus [sinusal] NOS R00.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Tachycardia
abnormally rapid heartbeat, usually with a heart rate above 100 beats per minute for adults. tachycardia accompanied by disturbance in the cardiac depolarization (cardiac arrhythmia) is called tachyarrhythmia.
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.
Convert R00.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About R00.0Overview
What is the ICD-10 code for tachycardia, unspecified?
The ICD-10-CM code for tachycardia, unspecified is R00.0 (sometimes written as R000). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is R00.0 (Abnormalities of heart beat) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report tachycardia, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does R00.0 group to?
When tachycardia, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 309, 310, 308, with relative weights from 0.5686 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Can R00.0 be a principal diagnosis?
Use it with care. This is a symptom code, so once a definitive diagnosis explaining the tachycardia, unspecified is established, that condition takes the principal position instead.
Can R00.0 be reported with I47.11?
Not as a rule. The Excludes1 note on R00.0 lists "inappropriate sinus tachycardia, so stated (I47.11)". 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).
