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ICD-10 Guide
ICD-10 CodesI50.21

I50.21

Billable

Acute systolic (congestive) heart failure

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/06/2025

Code Description

ICD-10 I50.21 is a billable code used to indicate a diagnosis of acute systolic (congestive) heart failure.

Key Diagnostic Point:

Acute systolic (congestive) heart failure (CHF) is characterized by the heart's inability to pump blood effectively, leading to inadequate perfusion of tissues and fluid accumulation in the lungs and other tissues. Clinically, patients may present with symptoms such as dyspnea, fatigue, and edema. The left ventricle is primarily involved, often due to conditions such as ischemic heart disease, hypertension, or valvular heart disease. Disease progression can vary, with acute episodes potentially leading to chronic heart failure if not managed effectively. Diagnostic considerations include clinical evaluation, echocardiography to assess ejection fraction, and biomarkers such as B-type natriuretic peptide (BNP) levels. Management typically involves diuretics, ACE inhibitors, beta-blockers, and lifestyle modifications. Early recognition and treatment are crucial to prevent further cardiac deterioration and improve patient outcomes.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Diagnostic complexity: Requires comprehensive assessment of cardiac function and underlying causes.
  • Treatment complexity: Involves multiple therapeutic modalities and potential hospitalization.
  • Documentation requirements: Detailed clinical notes and diagnostic tests are essential for accurate coding.
  • Coding specificity: Requires precise differentiation from other types of heart failure codes.

Audit Risk Factors

  • Common coding errors: Misclassification with chronic heart failure codes.
  • Documentation gaps: Incomplete clinical notes regarding symptom severity and treatment response.
  • Billing challenges: Denials may occur if documentation does not support the acute nature of the condition.

Specialty Focus

Medical Specialties

Cardiology

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Internal Medicine

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Related ICD-10 Codes

Related CPT Codes

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

Acute systolic heart failure significantly impacts population health, contributing to high morbidity and mortality rates. It places a substantial burden on healthcare systems due to frequent hospitalizations and the need for ongoing management. Quality measures often focus on timely intervention and effective management strategies to improve patient outcomes. Epidemiologically, heart failure prevalence is rising, necessitating increased awareness and resource allocation for prevention and treatment.

ICD-9 vs ICD-10

Acute systolic heart failure significantly impacts population health, contributing to high morbidity and mortality rates. It places a substantial burden on healthcare systems due to frequent hospitalizations and the need for ongoing management. Quality measures often focus on timely intervention and effective management strategies to improve patient outcomes. Epidemiologically, heart failure prevalence is rising, necessitating increased awareness and resource allocation for prevention and treatment.

Reimbursement & Billing Impact

reimbursement potential.

Resources

Clinical References

  • •
    ICD-10 Official Guidelines for I00-I99
  • •
    Clinical Documentation Requirements

Coding & Billing References

  • •
    ICD-10 Official Guidelines for I00-I99
  • •
    Clinical Documentation Requirements

Frequently Asked Questions

What specific conditions are covered by I50.21?

I50.21 specifically covers acute systolic heart failure, which may arise from acute myocardial infarction, severe hypertension, or acute valvular dysfunction. It is characterized by a reduced ejection fraction and clinical signs of congestion.

When should I50.21 be used instead of related codes?

I50.21 should be used when the patient presents with acute symptoms of heart failure with reduced ejection fraction. It is essential to differentiate it from chronic heart failure codes or acute diastolic heart failure (I50.22) based on clinical presentation and diagnostic findings.

What documentation supports I50.21?

Documentation should include clinical findings such as symptoms of heart failure, results from echocardiograms showing reduced ejection fraction, and any relevant laboratory tests like BNP levels. Clear notes on the acute nature of the condition and treatment provided are also necessary.