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v1.0.0
ICD-10 Guide
DiagnosesAcute On Chronic Hfref

Acute On Chronic Hfref

ICD-10 Coding for Acute on Chronic Heart Failure with Reduced Ejection Fraction(I50.23)

PRIMARY SPECIALTYCardiology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Acute On Chronic Hfref?
Essential facts and insights about Acute on Chronic Heart Failure with Reduced Ejection Fraction

Key Clinical Considerations:

  • Presence of symptoms such as dyspnea, fatigue, and edema indicating acute exacerbation of chronic heart failure.
  • Elevated B-type natriuretic peptide (BNP) or N-terminal pro b-type natriuretic peptide (NT-proBNP) levels.
  • Physical examination findings may include elevated jugular venous pressure, pulmonary crackles, and peripheral edema.
  • Imaging findings may include chest X-ray showing pulmonary congestion or echocardiogram demonstrating reduced ejection fraction.
  • Severity criteria may include New York Heart Association (NYHA) functional classification indicating worsening heart failure symptoms.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the acute exacerbation of chronic heart failure with reduced ejection fraction.
  • Specific terminology such as 'acute on chronic heart failure with reduced ejection fraction' must be used.
  • Examples include documenting the patient's symptoms, vital signs, and results of diagnostic tests.
  • Medical necessity must be established through documentation of the patient's clinical status and treatment plan.
  • Quality measures may require documentation of patient education and follow-up plans.

Coding Guidelines

Usage Guidelines & Examples

  • Use this diagnosis code when a patient with a history of chronic heart failure presents with acute symptoms.
  • Do not use this code for patients with acute heart failure without a chronic component or for those with preserved ejection fraction.
  • Similar codes include I50.21 (Acute heart failure, unspecified) and I50.22 (Acute on chronic heart failure, preserved ejection fraction).
  • Common errors include misclassifying acute heart failure as chronic or failing to document the acute exacerbation.
  • In complex cases, ensure that both acute and chronic components are clearly documented to support code selection.

Code Exclusions

Important Exclusions

  • Excludes conditions such as acute heart failure without chronic history or heart failure with preserved ejection fraction.
  • Alternative codes for excluded conditions include I50.21 for acute heart failure without chronic component.
  • Conditions are excluded to ensure accurate representation of the patient's clinical status and treatment needs.
  • Common mistakes include using this code for patients with acute heart failure only or failing to document chronicity.
  • Related but distinct conditions include pulmonary edema due to non-cardiac causes.

Related ICD-10 Codes

Primary Codes
I50.23
Acute on chronic heart failure with reduced ejection fraction
I50.22
Acute on chronic heart failure, preserved ejection fraction
Ancillary Codes
I11.0
E87.70
Differential Codes
I50.21
I50.21
if there is no documentation of chronic systolic heart failure.
I50.9
I50.9
when specific type and acuity are documented.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • This diagnosis applies to patients with a history of chronic heart failure who experience acute exacerbations.
  • Patient populations include older adults, individuals with comorbidities such as hypertension and diabetes, and those with a history of myocardial infarction.
  • Clinical settings include inpatient hospital admissions, outpatient follow-ups, and emergency department visits.
  • Specialty-specific applications are relevant in cardiology, internal medicine, and geriatrics.
  • Treatment contexts include medication management, diuretic therapy, and potential hospitalization for acute management.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Template 1

Template: 'Patient diagnosed with acute on chronic heart failure with reduced ejection fraction based on clinical findings.'

Template 2

Template: 'Clinical presentation consistent with acute exacerbation of chronic heart failure including dyspnea and edema.'

Template 3

Template: 'Diagnostic criteria met as evidenced by elevated BNP levels and echocardiogram findings.'

Template 4

Template: 'Treatment plan initiated for acute on chronic heart failure with diuretics and monitoring of vital signs.'

Template 5

Template: 'Follow-up care for acute on chronic heart failure including monitoring of weight and symptoms.'

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What documentation is required for this diagnosis?

Documentation must include clinical findings, diagnostic test results, and treatment plans.

How does this differ from similar diagnoses?

This diagnosis specifically indicates an acute exacerbation of chronic heart failure with reduced ejection fraction.

What are common billing considerations?

Ensure that documentation supports the medical necessity of services provided for acute exacerbation.

What procedures are typically associated?

Related CPT codes may include echocardiograms, BNP testing, and hospital admission codes.

Are there any quality reporting implications?

Quality measures may include tracking readmission rates and adherence to heart failure management protocols.