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ICD-10-CM 2027 diagnosis code

I50.813Acute on chronic right heart failure

✓ Billable / specific

I50.813 is a valid, billable ICD-10-CM code for acute on chronic right heart failure. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code last changed in FY2018 (effective October 1, 2017). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About I50.813

I50.813 is the ICD-10-CM diagnosis code for acute on chronic right heart failure. It belongs to category I50 (heart failure), block I30-I5A (other forms of heart disease) and chapter 9 (diseases of the circulatory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within I50.81 (right heart failure), I50.813 is specifically for acute on chronic right heart failure. Related codes cover unspecified (I50.810), acute right heart failure (I50.811), chronic right heart failure (I50.812) and due to left heart failure (I50.814).

Code first: heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8), heart failure due to hypertension (I11.0), heart failure due to hypertension with chronic kidney disease (I13.-), heart failure following surgery (I97.13-) and 2 more.

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 291 (Heart Failure and Shock with MCC, relative weight 1.2685), DRG 292 (Heart Failure and Shock with CC, relative weight 0.8616), DRG 293 (Heart Failure and Shock without CC/MCC, relative weight 0.5462), DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 05 (Diseases and Disorders of the Circulatory System) and MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), 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 was added in FY2018, effective October 1, 2017.

Before ICD-10, this condition was coded in ICD-9-CM as 428.9 (heart failure, unspecified).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Acute on chronic isolated right heart failure
  • Acute on chronic (isolated) right ventricular failure
  • Acute decompensation of chronic (isolated) right ventricular failure
  • Acute exacerbation of chronic (isolated) right ventricular failure

Notes that apply from higher levels

Instructions written at a parent level also apply to I50.813.

› From I50 Heart failure
Excludes2
  • cardiac arrest (I46.-)
  • neonatal cardiac failure (P29.0)
Code first
  • heart failure complicating abortion or ectopic or molar pregnancy (O00-O07, O08.8)
  • heart failure due to hypertension (I11.0)
  • heart failure due to hypertension with chronic kidney disease (I13.-)
  • heart failure following surgery (I97.13-)
  • obstetric surgery and procedures (O75.4)
  • rheumatic heart failure (I09.81)

Broader instructions also apply from Chapter 9: Diseases of the circulatory system.

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to I50.813.

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.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 428.9Heart failure, unspecifiedapproximate

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
  • FY2018 (effective 10/1/2017): Added
  • No changes since FY2018.

Common questions about I50.813

Is I50.813 billable?

Yes. I50.813 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can I50.813 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict I50.813 as a principal diagnosis.

Is I50.813 a CC or MCC?

No. I50.813 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does I50.813 group to?

I50.813 is used in the MS-DRG v44.0 logic for MS-DRG 291 (Heart Failure and Shock with MCC), MS-DRG 292 (Heart Failure and Shock with CC), MS-DRG 293 (Heart Failure and Shock without CC/MCC), MS-DRG 791 (Prematurity with Major Problems) and MS-DRG 793 (Full Term Neonate with Major Problems). 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 I50.813?

The CMS General Equivalence Mappings map I50.813 to ICD-9-CM 428.9.