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ICD Hub / Diseases of the circulatory system (I00–I99) / BA00.1 - Isolated diastolic hypertension
ICD-11

ICD-11 Codes
for BA00.1 - Isolated diastolic hypertension
Teodor Jurukovski January 1, 1970
Fact checked by: Teodor Jurukovski
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Understanding Isolated Diastolic Hypertension (BA00.1)

Isolated diastolic hypertension, identified by the ICD-11 code BA00.1, is a specific type of high blood pressure. It is characterised by elevated diastolic blood pressure (the bottom number) while systolic blood pressure (the top number) remains within the normal range. This condition is also commonly referred to as IDH or simply high diastolic blood pressure when the systolic reading is not elevated. It is a subcategory of essential hypertension, meaning no secondary cause has been identified. Isolated diastolic hypertension typically affects individuals younger than 55 years old, as arterial stiffness tends to increase systolic pressure with age.

Common Signs and Symptoms

Many individuals with isolated diastolic hypertension experience no noticeable symptoms, leading to its description as a 'silent condition'. However, if diastolic blood pressure rises significantly, particularly to 120 mmHg or higher, certain symptoms may manifest. These can include headaches, nosebleeds, shortness of breath, or feelings of anxiety. In cases of extremely high diastolic pressure accompanied by other severe symptoms like chest pain, confusion, severe headache, or vision changes, it may indicate a hypertensive emergency requiring immediate medical attention.

Key Causes and Risk Factors

While the exact cause of isolated diastolic hypertension is not always clear, several risk factors are associated with its development. These include being overweight or obese, which is a significant contributor. Lifestyle factors such as smoking, excessive alcohol consumption, a diet high in sodium and low in potassium, and a sedentary lifestyle also play a role. Other contributing factors can include obstructive sleep apnea and certain underlying health conditions like diabetes or kidney disease. Age is also a consideration, with this condition being more prevalent in adults under 55.

Diagnostic Pathways

The diagnosis of isolated diastolic hypertension is typically made through regular blood pressure measurements. Healthcare providers will assess blood pressure readings, usually requiring elevated diastolic pressure (defined as 80 mmHg or higher) on at least two separate occasions, while systolic pressure remains below the hypertensive threshold (often considered less than 130 mmHg or 140 mmHg depending on current guidelines). Ambulatory blood pressure monitoring, which involves wearing a device that records blood pressure over a 24-hour period, may also be used to obtain a more comprehensive understanding of blood pressure patterns and confirm the diagnosis.

Treatment and Lifestyle Management

Management of isolated diastolic hypertension often begins with lifestyle modifications. These can be highly effective in lowering diastolic blood pressure and include adopting a heart-healthy diet, such as the Mediterranean or DASH diet, maintaining a healthy body weight, engaging in regular aerobic exercise, quitting smoking, and limiting alcohol intake. If lifestyle changes are insufficient or if other cardiovascular risk factors are present, a healthcare provider may prescribe antihypertensive medication. The decision to use medication is often tailored to the individual's age, overall cardiovascular risk profile, and the severity of the elevated diastolic pressure.

Coding and Reporting Considerations

For accurate medical record-keeping and billing, the ICD-11 code BA00.1 is used to specifically identify Isolated diastolic hypertension. This code falls under the broader category of BA00 Essential hypertension. Proper documentation of the diagnosis, including the specific blood pressure readings and any associated risk factors or complications, is crucial for correct coding. This ICD-11 code is reportable and billable when a patient is diagnosed with this condition, ensuring appropriate classification of health encounters.

Frequently asked questions

What is the ICD-11 classification meaning of BA00.1?
BA00.1 is the ICD-11 code for Isolated diastolic hypertension, a specific category within essential hypertension.
How does ICD-11 code BA00.1 differentiate from other essential hypertension classifications?
BA00.1 is distinguished from other essential hypertension codes such as BA00.0 (Combined diastolic and systolic hypertension) and BA00.2 (Isolated systolic hypertension) by its specific designation of elevated diastolic blood pressure without concurrent elevated systolic blood pressure.
When is the ICD-11 code BA00.1 applied in coding?
The ICD-11 code BA00.1 is applied when the documented diagnosis is specifically isolated diastolic hypertension.
What does the term "isolated diastolic" in ICD-11 code BA00.1 signify regarding hypertension?
In ICD-11, "isolated diastolic" in BA00.1 signifies a hypertension pattern where the diastolic blood pressure is elevated, and the systolic blood pressure is not.
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