R00.0 — Tachycardia, unspecified
Is R00.0 billable?
Yes, but R00.0 is an unspecified code. R00.0 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, R00.0 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting R00.0 — the more specific alternatives are listed below.
More specific alternatives
R00.0 at a glance
| Code | R00.0 |
|---|---|
| Description | Tachycardia, unspecified |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does R00.0 group to?
R00.0 sits in MDC 05 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 308Cardiac Arrhythmia and Conduction Disorders with MCCmedical
- 309Cardiac Arrhythmia and Conduction Disorders with CCmedical
- 310Cardiac Arrhythmia and Conduction Disorders without CC/MCCmedical
How is R00.0 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to R00.0. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Fast pulse
- Tachycardia
- Heart beat › rapid
- Pulse › fast
- Pulse › rapid
- Rapid › heart
- Sinus › tachycardia
- Tachycardia › sinoauricular NOS
- Tachycardia › sinus [sinusal] NOS
Excludes1 — never code together
The conditions below can never be reported together with R00.0 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Inclusion terms
Alternative wording in documentation that is classified to R00.0.
- Rapid heart beat
- Sinoauricular tachycardia NOS
- Sinus [sinusal] tachycardia NOS
Excludes1 — never code together — inherited from R00
The conditions below can never be reported together with R00.0 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- abnormalities originating in the perinatal period (P29.1-)
Excludes2 — not included here — inherited from Chapter 18
The conditions below are not part of R00.0, but a patient may have both at the same time. When documentation supports it, R00.0 and the excluded code may both be reported.
Excludes2 — not included here — inherited from R00
The conditions below are not part of R00.0, but a patient may have both at the same time. When documentation supports it, R00.0 and the excluded code may both be reported.
- specified arrhythmias (I47-I49)
How long has R00.0 existed?
R00.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with R00.0?
ICD-10-CM declares these codes mutually exclusive with R00.0 — exactly one of each pair can be correct for a given encounter.