Unraveling Hyponatremia ICD 10 Code: Your Essential Guide

 Hyponatremia ICD 10 Code

Hyponatremia ICD 10 Code


Hyponatremia is a disorder characterized by a low concentration of sodium in the blood. It can be caused by various conditions, such as dehydration, kidney disease, heart failure, liver cirrhosis, syndrome of inappropriate antidiuretic hormone secretion (SIADH), and certain medications.

The ICD 10 code for hyponatremia is E87.11. This code belongs to the category of other disorders of fluid, electrolyte, and acid-base balance. It can be used to indicate a diagnosis for reimbursement purposes.

Conditions Included and Excluded by ICD 10 Code E87.1

The ICD 10 code E87.1 is applicable to:

  • Sodium deficiency
  • Hypo-osmolality

ICD 10 Code for some similar conditions

ICD-10 Code Description
E22.2 Syndrome of inappropriate antidiuretic hormone secretion
O21.1 Hyperemesis gravidarum
O08.5 Other complications following (suspected) ectopic pregnancy
G72.3 Familial periodic paralysis
E23.2 Diabetes insipidus

The ICD 10 code E87.1 is grouped within the diagnostic-related group (DRG) of miscellaneous disorders of nutrition, metabolism, fluids, and electrolytes with or without major complications or comorbidities (MCC). The DRG determines the payment rate for hospital stays based on the severity and complexity of the patient’s condition.

Symptoms of Hyponatremia 

Symptoms of hyponatremia (low sodium levels) may include:

1. Nausea and vomiting

2. Headache

3. Confusion or disorientation

4. Fatigue and weakness

5. Muscle cramps or spasms

6. Seizures

7. Irritability or mood changes

8. Loss of appetite

9. Swelling in the hands, feet, or legs

10. Difficulty concentrating or remembering

11. Low blood pressure

12. Rapid heart rate

Causes of Hyponatremia

The causes of hyponatremia (low sodium levels) can be diverse and include:

1. Excessive Fluid Intake: Consuming large amounts of water or fluids without adequate sodium intake can dilute the sodium concentration in the blood, leading to hyponatremia.

2. Medications: Certain medications, such as diuretics, antidepressants, and antiepileptic drugs, can interfere with the body’s sodium balance and contribute to hyponatremia.

3. Syndrome of Inappropriate Antidiuretic Hormone (SIADH): This condition occurs when the body releases too much antidiuretic hormone (ADH), causing the kidneys to retain water and dilute the sodium concentration.

4. Kidney Dysfunction: Kidney diseases or conditions that impair kidney function can disrupt the body’s ability to regulate sodium and lead to hyponatremia.

5. Hormonal Imbalances: Disorders affecting the adrenal glands, such as Addison’s disease, can result in insufficient production of hormones that help maintain sodium balance.

6. Heart Failure and Liver Cirrhosis: These conditions can lead to fluid retention and dilution of sodium levels in the bloodstream.

7. Excessive Sweating: Profuse sweating, especially when accompanied by inadequate sodium replacement, can deplete sodium levels and contribute to hyponatremia.

8. Syndrome of Cerebral Salt Wasting (CSW): CSW is a rare condition characterized by excessive sodium excretion in the urine, leading to hyponatremia.

9. High-intensity Exercise: Intense physical activity can cause excessive sweating and loss of sodium through sweat, potentially leading to hyponatremia if sodium is not adequately replenished.

10. Chronic Illnesses: Certain chronic illnesses, such as congestive heart failure, liver disease, and lung disease, can disrupt the body’s sodium balance and contribute to hyponatremia.


The treatment for hyponatremia (low sodium levels) depends on the underlying cause, the severity of symptoms, and the individual’s overall health. Some common treatment approaches include:

1. Fluid Restriction: In cases of mild hyponatremia, where symptoms are not severe, restricting fluid intake may be recommended to help restore normal sodium levels.

2. Sodium Supplementation: In cases where hyponatremia is due to insufficient sodium intake or excessive sodium loss, oral or intravenous sodium supplementation may be prescribed to restore sodium levels.

3. Medication Adjustments: If hyponatremia is caused by medications that affect fluid balance or sodium levels, adjusting the dosage or switching to alternative medications may be necessary.

4. Treating Underlying Conditions: Addressing and managing any underlying medical conditions contributing to hyponatremia, such as heart failure or kidney disease, is crucial for restoring sodium balance.

5. Diuretics: In certain cases, when hyponatremia is associated with fluid retention, diuretic medications may be prescribed to increase urine output and promote sodium excretion.

6. Intravenous Fluids: Severe or symptomatic hyponatremia may require intravenous administration of hypertonic saline solutions to raise sodium levels more rapidly.

7. Close Monitoring: Regular monitoring of sodium levels, as well as fluid intake and output, is essential to ensure appropriate treatment and prevent complications.

Complicatons of Hyponatremia

Hyponatremia (low sodium levels) can lead to several complications, including:
1. Neurological Symptoms: Severe hyponatremia can cause neurological symptoms, such as confusion, disorientation, seizures, and even coma. These occur due to the impact of low sodium levels on brain function.
2. Cerebral Edema: Rapid correction of hyponatremia or a rapid rise in sodium levels can lead to the development of cerebral edema, which is the swelling of the brain. This condition can cause severe headaches, nausea, vomiting, and changes in consciousness, and in severe cases, it can be life-threatening.
3. Gait Disturbances and Falls: Hyponatremia can affect muscle strength and coordination, leading to gait disturbances and an increased risk of falls, particularly in elderly individuals.
4. Osmotic Demyelination Syndrome (Central Pontine Myelinolysis): If hyponatremia is corrected too rapidly, it can result in the destruction of the myelin sheath in the brain, leading to central pontine myelinolysis. This condition can cause permanent neurological damage, resulting in paralysis, movement disorders, and speech difficulties.
5. Cardiac Arrhythmias: Imbalances in sodium levels can disrupt the electrical signaling in the heart, leading to abnormal heart rhythms or arrhythmias. These can range from mild palpitations to life-threatening conditions such as ventricular fibrillation.
6. Respiratory Issues: Hyponatremia can affect the function of the respiratory muscles, leading to breathing difficulties and respiratory failure in severe cases.
7. Impaired Cognitive Function: Chronic or recurrent hyponatremia can have long-term effects on cognitive function, including memory problems, decreased attention span, and impaired concentration.
8. Increased Risk of Bone Fractures: Low sodium levels can contribute to decreased bone density and increased risk of fractures.

Hyponatremia can have serious consequences if left untreated. It can cause symptoms such as confusion, headache, nausea, vomiting, muscle weakness, seizures, coma, and even death. Therefore, it is important to identify and treat the underlying cause of hyponatremia and correct the sodium level in the blood.

FAQs for Hyponatremia ICD 10 Code

Q: What is hyponatremia?

 A: Hyponatremia is a condition that occurs when the sodium level in your blood is too low. Sodium is an essential electrolyte that helps regulate fluid balance, nerve function, and muscle contraction in your body. Having a low sodium level can affect your brain, heart, kidneys, and other organs.

 Q: What is the ICD 10 code for hyponatremia?

A: The ICD 10 code for hyponatremia is E87.1. This code belongs to the category of other disorders of fluid, electrolyte, and acid-base balance. It can be used to indicate a diagnosis for reimbursement purposes.

 Q: What are the types of hyponatremia?

 A: Hyponatremia can be classified into three types based on the osmolality of the blood:

 Hypo-osmolar hyponatremia: This is the most common type of hyponatremia. It occurs when there is too much water in the blood relative to sodium. This can dilute the sodium concentration and lower the osmolality of the blood.

Iso-osmolar hyponatremia: This type of hyponatremia occurs when there is an increase in substances other than sodium or water in the blood, such as glucose or mannitol. These substances can interfere with the measurement of sodium and make it appear lower than it actually is.

Hyper-osmolar hyponatremia: This type of hyponatremia occurs when there is a loss of both water and sodium from the blood, but more water than sodium. This can increase the osmolality of the blood and cause dehydration.

Q: What are the causes of hyponatremia?

 A: Hyponatremia can have many different causes, depending on the type and severity of the condition. Some of the common causes include:

 Dehydration: This can occur due to excessive sweating, vomiting, diarrhea, fever, burns, or inadequate fluid intake. Dehydration can cause hyper-osmolar hyponatremia.

Kidney disease: The kidneys are responsible for regulating the fluid and electrolyte balance in the body. Kidney disease can impair this function and cause either hypo-osmolar or hyper-osmolar hyponatremia.

Heart failure: Heart failure can reduce the blood flow to the kidneys and cause fluid retention in the body. This can lead to hypo-osmolar hyponatremia.

Liver cirrhosis: Liver cirrhosis can cause portal hypertension, which is an increase in the pressure in the veins that drain blood from the digestive organs to the liver. Portal hypertension can cause fluid accumulation in the abdomen (ascites) and in the lungs (pleural effusion). This can result in hypo-osmolar hyponatremia.

Syndrome of inappropriate antidiuretic hormone secretion (SIADH): SIADH is a condition where the body produces too much antidiuretic hormone (ADH), which is a hormone that helps regulate water balance in the body. ADH tells the kidneys to reabsorb water from the urine and return it to the blood. SIADH can cause hypo-osmolar hyponatremia by increasing water retention and diluting sodium levels.

Certain medications: Some medications can affect sodium levels in different ways. For example, diuretics can increase sodium loss through urine; antidepressants, anticonvulsants, and painkillers can increase ADH production; and chemotherapy drugs can damage kidney function.

Q: What are the symptoms of hyponatremia?

 A: The symptoms of hyponatremia depend on how quickly and how severely the sodium level drops. Mild or chronic hyponatremia may not cause any noticeable symptoms or may cause vague symptoms such as fatigue, headache, nausea, or muscle cramps.

However, severe or acute hyponatremia can cause more serious symptoms such as confusion, agitation, hallucinations, seizures, coma, or even death. This is because a rapid drop in sodium levels can cause brain swelling (cerebral edema), which can damage brain cells and impair brain function.


Q: How is hyponatremia diagnosed?

 A: Hyponatremia is diagnosed by measuring the sodium level in a blood sample. A urine sample may also be collected to measure the urine osmolality and sodium level. These tests can help determine the type and cause of hyponatremia.

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Unraveling Hyponatremia ICD 10 Code: Your Essential Guide

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