I50.32

Chronic diastolic heart failure

Chronic diastolic heart failure, clinically referred to as heart failure with preserved ejection fraction (HFpEF), is a progressive condition characterized by the heart's inability to relax and fill properly during the diastolic phase of the cardiac cycle. This is primarily due to increased stiffness or decreased compliance of the left ventricular myocardium. While the ejection fraction remains within the normal or near-normal range (typically ≥50%), the elevated filling pressures required to maintain cardiac output lead to pulmonary and systemic congestion. This condition is highly prevalent in aging populations and is frequently associated with systemic comorbidities such as hypertension and metabolic syndrome.

Clinical Symptoms

Exertional dyspnea (shortness of breath during physical activity)
Paroxysmal nocturnal dyspnea
Orthopnea (difficulty breathing while lying flat)
Exercise intolerance and generalized fatigue
Peripheral edema (swelling of ankles, feet, or legs)
Jugular venous distention
Pulmonary rales (crackles) on auscultation
Presence of an S4 heart sound (atrial gallop)
Ascites or abdominal swelling
Hepatomegaly (enlarged liver due to venous congestion)
Unexplained weight gain from fluid retention

Common Causes

Long-standing systemic hypertension
Myocardial aging and senile amyloidosis
Obesity and metabolic syndrome
Type 2 diabetes mellitus
Chronic kidney disease
Coronary artery disease (ischemia-induced impaired relaxation)
Restrictive cardiomyopathy
Hypertrophic cardiomyopathy
Obstructive sleep apnea
Sedentary lifestyle and physical deconditioning

Documentation & Coding Tips

Explicitly define both acuity and type of heart failure to support I50.32.

Example: Patient with known chronic diastolic heart failure (HFpEF) presents for follow-up. Currently stable on home regimen, no signs of acute exacerbation. Clinical documentation clearly specifies chronic status and diastolic nature of dysfunction.

Billing Focus: Documentation must specify both chronic and diastolic to ensure I50.32 is selected over unspecified (I50.9) or acute (I50.31) codes.

Incorporate Ejection Fraction (EF) values to validate preserved status.

Example: Transthoracic echocardiogram confirms chronic diastolic heart failure with a preserved ejection fraction of 55 percent and evidence of grade II diastolic dysfunction. No systolic impairment noted.

Billing Focus: While the code is determined by clinical terminology, documenting an EF over 50 percent supports the diastolic (HFpEF) clinical classification.

Document the NYHA Functional Classification for severity assessment.

Example: Chronic diastolic heart failure, currently NYHA Class II. Patient reports mild limitations during physical activity such as climbing two flights of stairs but is comfortable at rest.

Billing Focus: NYHA classification helps justify medical necessity for complex E/M levels and diagnostic testing like stress tests.

Link comorbid conditions such as Hypertension or CKD using causative language.

Example: Hypertensive heart disease with chronic diastolic heart failure. Patient also has Stage 3a chronic kidney disease, likely secondary to long-standing hypertension and cardiorenal syndrome.

Billing Focus: Linking hypertension and heart failure triggers the use of I11.0, requiring the heart failure code (I50.32) as a secondary code.

Clarify the absence of acute symptoms to distinguish from acute on chronic status.

Example: Patient remains in the chronic phase of diastolic heart failure. No peripheral edema, no orthopnea, and no paroxysmal nocturnal dyspnea. Stable weight. Continue current diuretics.

Billing Focus: Ensures I50.32 is used instead of I50.33 (acute on chronic), which requires evidence of an active exacerbation.

Relevant CPT Codes

99213 - Office or other outpatient visit, established patient, 20-29 minutes
Used for routine follow-up of stable chronic diastolic heart failure where MDM is Low.
99214 - Office or other outpatient visit, established patient, 30-39 minutes
Applicable when the patient has multiple comorbidities or requires complex medication changes (e.g., titrating SGLT2 inhibitors).
93306 - Echocardiography, transthoracic, real-time with image documentation
The primary diagnostic tool used to confirm diastolic dysfunction and preserved ejection fraction.
93000 - Electrocardiogram, routine ECG with at least 12 leads
Performed to check for arrhythmias (like Atrial Fibrillation) or signs of LVH which are common in HFpEF.
99215 - Office or other outpatient visit, established patient, 40-54 minutes
Used when the patient is clinically unstable or has severe, multiple systemic complications requiring extensive coordination of care.
93701 - Bioelectrical impedance, whole body
Can be used in the clinic to monitor fluid status and volume overload in chronic heart failure patients.
83880 - B-type natriuretic peptide (BNP)
Used to assess the severity of heart failure and monitor response to diuretic therapy.
94010 - Spirometry
Often ordered to rule out pulmonary disease as a cause of dyspnea in patients suspected of having HFpEF.
93224 - Holter monitor, up to 48 hours
Indicated if paroxysmal atrial fibrillation is suspected as a trigger for diastolic dysfunction symptoms.
93458 - Catheter placement in coronary artery(s) for selective coronary angiography
May be performed to rule out ischemic heart disease as a contributing factor to diastolic heart failure.