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ICD-10-CM 2027 diagnosis code

R00.8Other abnormalities of heart beat

✓ Billable / specific

R00.8 is a valid, billable ICD-10-CM code for other abnormalities of heart beat. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Trigeminy, ICD-10 code for Gallop rhythm, ICD-10 code for Coupled rhythm, ICD-10 code for Bigeminal pulse.

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 R00.8

R00.8 is the ICD-10-CM diagnosis code for other abnormalities of heart beat. It belongs to category R00 (abnormalities of heart beat), 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R00, choose R00.8 (Other abnormalities of heart beat) only when documentation doesn't support a more specific option: tachycardia, unspecified (R00.0), bradycardia, unspecified (R00.1), Palpitations (R00.2) and unspecified abnormalities of heart beat (R00.9).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 314 (Other Circulatory System Diagnoses with MCC, relative weight 2.0873), DRG 315 (Other Circulatory System Diagnoses with CC, relative weight 0.9508) and DRG 316 (Other Circulatory System Diagnoses without CC/MCC, relative weight 0.6677), in MDC 05 (Diseases and Disorders of the Circulatory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 785.3 (other abnormal heart sounds).

Notes that apply from higher levels

Instructions written at a parent level also apply to R00.8.

› From R00 Abnormalities of heart beat
Excludes1
  • abnormalities originating in the perinatal period (P29.1-)
Excludes2
  • specified arrhythmias (I47-I49)

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

Alphabetic index entries

9 entries

Terms in the official ICD-10-CM index that lead to R00.8.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 785.3Other abnormal heart soundsapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about R00.8

Is R00.8 billable?

Yes. R00.8 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can R00.8 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict R00.8 as a principal diagnosis.

Is R00.8 a CC or MCC?

No. R00.8 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does R00.8 group to?

R00.8 is used in the MS-DRG v44.0 logic for MS-DRG 314 (Other Circulatory System Diagnoses with MCC), MS-DRG 315 (Other Circulatory System Diagnoses with CC) and MS-DRG 316 (Other Circulatory System Diagnoses without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for R00.8?

The CMS General Equivalence Mappings map R00.8 to ICD-9-CM 785.3.