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ICD Hub / Diseases of the circulatory system (I00–I99) / BA04.2 - Isolated systolic secondary hypertension
ICD-11

ICD-11 Codes
for BA04.2 - Isolated systolic secondary hypertension
Teodor Jurukovski January 1, 1970
Fact checked by: Teodor Jurukovski
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Understanding Isolated Systolic Secondary Hypertension

Isolated systolic secondary hypertension, identified by the ICD-11 code BA04.2, is a specific type of high blood pressure. It is characterised by an elevated systolic blood pressure (the top number in a reading) while the diastolic blood pressure (the bottom number) remains within a normal range. This condition is distinct because it arises due to an identifiable underlying medical cause, differentiating it from primary hypertension. For billing and documentation purposes, this condition is often referred to as secondary hypertension with isolated systolic elevation.

What Causes Isolated Systolic Secondary Hypertension?

Unlike primary hypertension, isolated systolic secondary hypertension stems from a specific, identifiable underlying condition. Potential causes can include endocrine disorders such as hyperthyroidism or hypothyroidism, kidney diseases, issues with blood vessels like peripheral vascular disease or renal artery stenosis, and other conditions such as diabetes mellitus, aortic insufficiency, arteriovenous fistulas, or Paget disease. The arterial system's reduced elasticity, often seen with aging due to increased calcium and collagen deposition, can also contribute to elevated systolic pressure.

Diagnosing Isolated Systolic Secondary Hypertension

The diagnosis of isolated systolic secondary hypertension relies on accurate blood pressure measurements. Typically, a systolic blood pressure reading of 130 mmHg or higher, with a diastolic reading below 80 mmHg, confirmed over multiple readings, indicates the condition. Historically, a threshold of 140 mmHg systolic was used, but current guidelines often consider 130 mmHg as hypertensive. A crucial part of the diagnostic process involves identifying the specific underlying cause, which may require further clinical investigations and laboratory tests to assess for potential secondary conditions.

Managing Isolated Systolic Secondary Hypertension

Effective management of isolated systolic secondary hypertension involves a two-pronged approach. Firstly, it is essential to address and treat the identifiable underlying cause responsible for the hypertension. Secondly, standard hypertension management strategies are employed, including lifestyle modifications such as dietary salt restriction, weight management, adopting a heart-healthy diet like DASH, increasing physical activity, limiting alcohol intake, and quitting smoking. Pharmacological treatments, often starting with a single oral antihypertensive agent, may include diuretics, calcium channel blockers, ACE inhibitors, or ARBs, with careful monitoring to ensure the systolic pressure is controlled without excessively lowering the diastolic pressure.

Synonyms and ICD-11 Coding for Isolated Systolic Secondary Hypertension

Isolated systolic secondary hypertension is also known by patient-friendly terms such as "high top number blood pressure" or "elevated systolic pressure with normal diastolic pressure." In clinical and billing contexts, it may be documented as secondary hypertension with isolated systolic elevation. The definitive ICD-11 code for this condition is BA04.2. This code falls under the broader category of Secondary hypertension (BA04) within Chapter 11 of the ICD-11 classification system, Diseases of the circulatory system.

When to Seek Professional Medical Advice

If you experience consistently high systolic blood pressure readings, particularly when the diastolic number is within a normal range, it is important to consult a healthcare professional. Early diagnosis and management are crucial, as untreated high systolic blood pressure can increase the risk of serious health complications such as stroke, heart disease, dementia, and chronic kidney disease. A medical expert can accurately diagnose the condition, identify any underlying causes, and recommend an appropriate treatment plan tailored to your individual needs.

Frequently asked questions

What is the ICD-11 classification meaning of Isolated systolic secondary hypertension?
Isolated systolic secondary hypertension is a classification within secondary hypertension that specifically denotes a pattern of elevated systolic blood pressure with normal diastolic blood pressure, where an identifiable cause exists.
What is the ICD-11 code for Isolated systolic secondary hypertension?
The ICD-11 code for Isolated systolic secondary hypertension is BA04.2.
How does Isolated systolic secondary hypertension (BA04.2) differ from other secondary hypertension codes in ICD-11?
BA04.2 specifically identifies a pattern of isolated systolic hypertension, distinguishing it from codes that include combined systolic and diastolic hypertension (BA04.0) or isolated diastolic hypertension (BA04.1) within the secondary hypertension category.
How is the underlying cause of Isolated systolic secondary hypertension coded in ICD-11?
The 'secondary' nature of Isolated systolic secondary hypertension requires post-coordination with a code specifying the identified causing condition, as per ICD-11 coding rules for secondary hypertension.
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