I1A: Other hypertension

I1A refers to Other hypertension, which includes various forms and complications of elevated blood pressure. Depending on the subtype, hypertension may affect the heart, kidneys, or both, and may be classified as primary, secondary, or a medical emergency.

Symptoms

• Often asymptomatic – Especially in I10 (primary hypertension)
• Headaches and blurred vision – May appear in hypertensive crisis (I16)
• Shortness of breath or chest pain – Found in I11 and I13 (cardiac involvement)
• Fatigue, edema, or proteinuria – Signs of kidney involvement (I12, I13)
• Dizziness, confusion – Can signal hypertensive emergency (I16)
• Secondary symptoms – Present in I15 due to underlying endocrine or renal conditions
• Variable readings – Common in I1A, covering other specified hypertension types

Diagnosis

Diagnosis of Other hypertension is based on repeated elevated blood pressure readings, clinical examination, echocardiography, urine analysis, renal function tests, and ambulatory BP monitoring. Evaluation of end-organ damage is essential in types like I11–I13 and I16.

ICD10 Code Usage

ICD10 code I1A is widely used in cardiology, nephrology, internal medicine, and emergency care. It supports medical documentation, treatment planning (medication, lifestyle changes), screening for complications, and billing for antihypertensive therapy or hospitalization.

Related Codes

• I10 – Essential (primary) hypertension
• I11 – Hypertensive heart disease
• I12 – Hypertensive chronic kidney disease
• I13 – Hypertensive heart and chronic kidney disease
• I15 – Secondary hypertension
• I16 – Hypertensive crisis

FAQs

Q1: What is ICD10 code I1A?
A: It documents Other hypertension, representing a form of hypertension with or without associated cardiac, renal, or secondary causes.

Q2: How is essential hypertension (I10) different from secondary hypertension (I15)?
A: I10 has no identifiable cause, while I15 results from another disease such as renal artery stenosis or adrenal disorders.

Q3: What is hypertensive crisis (I16)?
A: A medical emergency where blood pressure exceeds 180/120 mmHg with or without end-organ damage.

Q4: Can hypertension be reversed?
A: It can be managed effectively with medication, diet, exercise, and stress control, but is rarely completely cured.

Q5: Who manages these conditions?
A: Primary care physicians, cardiologists, nephrologists, and emergency doctors depending on severity and organ involvement.

Conclusion

ICD10 code I1A ensures proper classification and monitoring of Other hypertension, enabling effective intervention, risk reduction, and prevention of life-threatening cardiovascular and renal complications.