Heart failure (I50) ICD-10-CM
The I50 code range covers heart failure with 29 ICD-10-CM diagnosis codes. 23 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- 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
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the I50 Range 29 codes · 23 billable
- I50 Heart failureNon-billable
- I50.1 Left ventricular failure, unspecified
- I50.2 Systolic (congestive) heart failureNon-billable
- I50.20 Unspecified systolic (congestive) heart failure
- I50.21 Acute systolic (congestive) heart failure
- I50.22 Chronic systolic (congestive) heart failure
- I50.23 Acute on chronic systolic (congestive) heart failure
- I50.3 Diastolic (congestive) heart failureNon-billable
- I50.30 Unspecified diastolic (congestive) heart failure
- I50.31 Acute diastolic (congestive) heart failure
- I50.32 Chronic diastolic (congestive) heart failure
- I50.33 Acute on chronic diastolic (congestive) heart failure
- I50.4 Combined systolic (congestive) and diastolic (congestive) heart failureNon-billable
- I50.40 Unspecified combined systolic (congestive) and diastolic (congestive) heart failure
- I50.41 Acute combined systolic (congestive) and diastolic (congestive) heart failure
- I50.42 Chronic combined systolic (congestive) and diastolic (congestive) heart failure
- I50.43 Acute on chronic combined systolic (congestive) and diastolic (congestive) heart failure
- I50.8 Other heart failureNon-billable
- I50.81 Right heart failureNon-billable
- I50.810 Right heart failure, unspecified
- I50.811 Acute right heart failure
- I50.812 Chronic right heart failure
- I50.813 Acute on chronic right heart failure
- I50.814 Right heart failure due to left heart failure
- I50.82 Biventricular heart failure
- I50.83 High output heart failure
- I50.84 End stage heart failure
- I50.89 Other heart failure
- I50.9 Heart failure, unspecified
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the I50 range.
Diastole
Post-systolic relaxation of the HEART, especially the HEART VENTRICLES.
Heart Failure
A heterogeneous condition in which the heart is unable to pump out sufficient blood to meet the metabolic need of the body. Heart failure can be caused by structural defects, functional abnormalities (VENTRICULAR DYSFUNCTION), or a sudden overload beyond its capacity. Chronic heart failure is more common than acute heart failure which results from sudden insult to cardiac function, such as MYOCARDIAL INFARCTION.
Heart Failure, Diastolic
Heart failure caused by abnormal myocardial relaxation during DIASTOLE leading to defective cardiac filling.
Heart Failure, Systolic
Heart failure caused by abnormal myocardial contraction during SYSTOLE leading to defective cardiac emptying.
Systole
Period of contraction of the HEART, especially of the HEART VENTRICLES.
About the I50 Code Range
The ICD-10 code I50 covers various forms of heart failure, a condition where the heart struggles to pump blood effectively. This section includes specific codes for different types such as systolic, diastolic, left ventricular, right heart, combined, and high-output heart failure, helping healthcare providers identify the precise nature of the condition.
These codes are essential for coding detailed diagnoses like I50.1 for left ventricular failure, often known as chronic left-sided heart failure or acute congestive heart failure, and I50.21 for acute systolic heart failure, which may also be referred to as heart failure with reduced ejection fraction. Other distinctions include I50.31 for acute diastolic heart failure, commonly termed heart failure with normal ejection fraction, and I50.81 for right heart failure, sometimes called right ventricular failure or cardiac ascites. Recognizing these synonyms alongside their ICD-10 codes helps with accurate medical documentation and billing. Codes like I50.9 cover unspecified heart failure cases, including several synonyms such as congestive heart failure and heart failure following cardiac surgery. Understanding this range of codes improves clarity when documenting heart failure types in medical records and claims.
Questions About This Page
How many billable codes are in the I50 range?
Of the 29 codes in this range, 23 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the I50 range classify?
The range classifies heart failure. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
