2025 ICD-10-CM Diagnosis Code I1A

Specific Coding Applicable to Other hypertension

Non-specific codes like I1A require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for other hypertension:

Clinical Information

• Essential Hypertension

  hypertension that occurs without known cause, or preexisting renal disease. associated polymorphisms for a number of genes have been identified, including agt, gnb3, and ece1. omim: 145500

• Familial Primary Pulmonary Hypertension

  familial or idiopathic hypertension in the pulmonary circulation which is not secondary to other disease.

• Hypertension

  persistently high systemic arterial blood pressure. based on multiple readings (blood pressure determination), hypertension is currently defined as when systolic pressure is consistently greater than 140 mm hg or when diastolic pressure is consistently 90 mm hg or more.

• Hypertension, Malignant

  a condition of markedly elevated blood pressure with diastolic pressure usually greater than 120 mm hg. malignant hypertension is characterized by widespread vascular damage, papilledema, retinopathy, hypertensive encephalopathy, and renal dysfunction.

• Hypertension, Portal

  abnormal increase of resistance to blood flow within the hepatic portal system, frequently seen in liver cirrhosis and conditions with obstruction of the portal vein.

• Hypertension, Pregnancy-Induced

  a condition in pregnant people with elevated systolic (>140 mm hg) and diastolic (>90 mm hg) blood pressure on at least two occasions 6 h apart. hypertension complicates 8-10% of all pregnancies, generally after 20 weeks of gestation. gestational hypertension can be divided into several broad categories according to the complexity and associated symptoms, such as edema; proteinuria; seizures; abnormalities in blood coagulation and liver functions.

• Hypertension, Pulmonary

  increased vascular resistance in the pulmonary circulation, usually secondary to heart diseases or lung diseases.

• Hypertension, Renal

  persistent high blood pressure due to kidney diseases, such as those involving the renal parenchyma, the renal vasculature, or tumors that secrete renin.

• Hypertension, Renovascular

  hypertension due to renal artery obstruction or compression.

• Idiopathic Noncirrhotic Portal Hypertension

  portal hypertension without known risk factors for hypertension, e.g., hepatic cirrhosis and schistosomiasis. idiopathic noncirrhotic portal hypertension is most often associated with pathology in the portal system vasculature.

• Intra-Abdominal Hypertension

  pathological elevation of intra-abdominal pressure (>12 mm hg). it may develop as a result of sepsis; pancreatitis; capillary leaks, burns, or surgery. when the pressure is higher than 20 mm hg, often with end-organ dysfunction, it is referred to as abdominal compartment syndrome.

• Intracranial Hypertension

  increased pressure within the cranial vault. this may result from several conditions, including hydrocephalus; brain edema; intracranial masses; severe systemic hypertension; pseudotumor cerebri; and other disorders.

• Isolated Systolic Hypertension

  hypertension with elevated systolic and normal diastolic blood pressure. it is the most common subtype in the elderly and is related to vascular stiffness and atherosclerotic plaque buildup.

• Masked Hypertension

  phenomenon where increased blood pressure readings taken in non-clinical settings (e.g., home blood pressure monitoring) do not replicate in clinical settings.

• Ocular Hypertension

  a condition in which the intraocular pressure is elevated above normal and which may lead to glaucoma.

• Persistent Fetal Circulation Syndrome

  a syndrome of persistent pulmonary hypertension in the newborn infant (infant, newborn) without demonstrable heart diseases. this neonatal condition can be caused by severe pulmonary vasoconstriction (reactive type), hypertrophy of pulmonary arterial muscle (hypertrophic type), or abnormally developed pulmonary arterioles (hypoplastic type). the newborn patient exhibits cyanosis and acidosis due to the persistence of fetal circulatory pattern of right-to-left shunting of blood through a patent ductus arteriosus (ductus arteriosus, patent) and at times a patent foramen ovale (foramen ovale, patent).

• Pre-Eclampsia

  a complication of pregnancy, characterized by a complex of symptoms including maternal hypertension and proteinuria with or without pathological edema. symptoms may range between mild and severe. pre-eclampsia usually occurs after the 20th week of gestation, but may develop before this time in the presence of trophoblastic disease.

• Pseudotumor Cerebri

  a condition marked by raised intracranial pressure and characterized clinically by headaches; nausea; papilledema, peripheral constriction of the visual fields, transient visual obscurations, and pulsatile tinnitus. obesity is frequently associated with this condition, which primarily affects women between 20 and 44 years of age. chronic papilledema may lead to optic nerve injury (see optic nerve diseases) and visual loss (see blindness).

• Pulmonary Arterial Hypertension

  a progressive rare pulmonary disease characterized by high blood pressure in the pulmonary artery.

• Sinistral Portal Hypertension

  portal hypertension of the splenic vein due to occlusion caused by pancreatic pathology such as pancreatic pseudocyst and pancratic cancer. sinistral portal hypertension is associated with gastric varices and acute hematemesis.

• Varicose Ulcer

  skin breakdown or ulceration in the drainage area of a varicose vein, usually in the leg.

• White Coat Hypertension

  phenomenon where blood pressure readings are elevated only when taken in clinical settings.

• Pulmonary Circulation

  the circulation of the blood through the lungs.

• Renal Artery Obstruction

  narrowing or occlusion of the renal artery or arteries. it is due usually to atherosclerosis; fibromuscular dysplasia; thrombosis; embolism, or external pressure. the reduced renal perfusion can lead to renovascular hypertension (hypertension, renovascular).

• Pulmonary Artery

  the short wide vessel arising from the conus arteriosus of the right ventricle and conveying unaerated blood to the lungs.

• Varicose Veins

  enlarged and tortuous veins.

• Blood Pressure

  pressure of the blood on the arteries and other blood vessels.

Patient Education

High Blood Pressure

What is blood pressure?

Blood pressure is the force of your blood pushing against the walls of your arteries. Each time your heart beats, it pumps blood into the arteries. Your blood pressure is highest when your heart beats, pumping the blood. This is called systolic pressure. When your heart is at rest, between beats, your blood pressure falls. This is called diastolic pressure.

Your blood pressure reading uses these two numbers. Usually the systolic number comes before or above the diastolic number. For example, 120/80 means a systolic of 120 and a diastolic of 80.

How is high blood pressure diagnosed?

High blood pressure usually has no symptoms. So the only way to find out if you have it is to get regular blood pressure checks from your health care provider. Your provider will use a gauge, a stethoscope or electronic sensor, and a blood pressure cuff. They will take two or more readings at separate appointments before making a diagnosis.

For children and teens, the health care provider compares the blood pressure reading to what is normal for other kids who are the same age, height, and sex.

What are the different types of high blood pressure?

There are two main types of high blood pressure: primary and secondary high blood pressure.:

• Primary, or essential, high blood pressure is the most common type of high blood pressure. For most people who get this kind of blood pressure, it develops over time as you get older.
• Secondary high blood pressure is caused by another medical condition or use of certain medicines. It usually gets better after you treat that condition or stop taking the medicines that are causing it.

Why do I need to worry about high blood pressure?

When your blood pressure stays high over time, it causes the heart to pump harder and work overtime, possibly leading to serious health problems such as heart attack, stroke, heart failure, and kidney failure.

What are the treatments for high blood pressure?

Treatments for high blood pressure include heart-healthy lifestyle changes and medicines.

You will work with your provider to come up with a treatment plan. It may include only the lifestyle changes. These changes, such as heart-healthy eating and exercise, can be very effective. But sometimes the changes do not control or lower your high blood pressure. Then you may need to take medicine. There are different types of blood pressure medicines. Some people need to take more than one type.

If your high blood pressure is caused by another medical condition or medicine, treating that condition or stopping the medicine may lower your blood pressure.

NIH: National Heart, Lung, and Blood Institute

Code History

• FY 2024 - Code Added, effective from 10/1/2023 through 9/30/2024