What is ICD 10 Code for Hypernatremia?

ICD 10 Code For Hypernatremia

ICD 10 Code for Hypernatremia

Hypernatremia is a condition characterized by an abnormally high level of sodium in the blood. Sodium is an essential electrolyte that helps regulate fluid balance, nerve impulses, and muscle contractions. However, too much sodium can cause dehydration, confusion, seizures, coma, and even death.

The normal range of sodium in the blood is between 135 and 145 milliequivalents per liter (mEq/L). Hypernatremia is defined as a sodium level above 145 mEq/L.

Causes of Hypernatremia

Hypernatremia can result from various causes, such as:

  • Excessive intake of salt or sodium-containing substances (e.g., medications, intravenous fluids, dietary supplements)
  • Loss of water due to vomiting, diarrhea, sweating, fever, burns, or kidney disease
  • Impaired thirst mechanism or inability to drink water (e.g., due to brain injury, dementia, stroke, or medication side effects)
  • Hormonal disorders that affect water and sodium balance (e.g., diabetes insipidus, Cushing’s syndrome, hyperaldosteronism)

Signs and Symptoms of Hypernatremia

Hypernatremia can cause various signs and symptoms depending on the severity and duration of the condition. Some common manifestations include:

  • Thirst
  • Dry mouth and mucous membranes
  • Weakness
  • Fatigue
  • Irritability
  • Restlessness
  • Confusion
  • Hallucinations
  • Muscle twitching
  • Seizures
  • Coma

Hypernatremia is a serious condition that requires prompt diagnosis and treatment. The treatment of hypernatremia depends on the underlying cause and the degree of dehydration. The main goal of treatment is to restore normal fluid and electrolyte balance by administering fluids (orally or intravenously) and correcting the cause of hypernatremia.

How to Code Hypernatremia in ICD-10-CM?

In ICD-10-CM, hypernatremia is coded as E87.0 – Hyperosmolality and hypernatremia. This code is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes. The code E87.0 is applicable to both hyperosmolality and hypernatremia because these conditions are often related and have similar causes and effects.

Hyperosmolality is a condition characterized by an abnormally high concentration of solutes (such as sodium) in the blood. Hyperosmolality can cause water to move out of the cells into the blood vessels, leading to cellular dehydration and shrinkage. Hyperosmolality can also affect the brain and cause neurological symptoms.

The code E87.0 belongs to the category E87 – Other disorders of fluid, electrolyte, and acid-base balance. This category includes various conditions that affect the balance of fluids and electrolytes in the body, such as hyponatremia (low sodium), hypokalemia (low potassium), acidosis (low pH), alkalosis (high pH), etc.

The code E87.0 has some exclusions that should be noted:

  • Diabetes insipidus (E23.2)
  • Electrolyte imbalance associated with hyperemesis gravidarum (O21.1)
  • Electrolyte imbalance following ectopic or molar pregnancy (O08.5)
  • Familial periodic paralysis (G72.3)

These conditions have their own specific codes in ICD-10-CM and should not be coded with E87.0.

The code E87.0 should be sequenced according to the coding guidelines for chapters E00-E89 – Endocrine, nutritional, and metabolic diseases. The general rule is to code first the underlying condition that caused the hypernatremia, followed by code E87.0 to indicate the manifestation.

For example:

  • E16.2 – Hypoglycemia unawareness due to impaired counter-regulation > E87.0 – Hyperosmolality and hypernatremia
  • E23.2 – Diabetes insipidus > N25.1 – Nephrogenic diabetes insipidus > E87.0 – Hyperosmolality and hypernatremia
  • T79.A1XA – Traumatic hemorrhagic shock, initial encounter > E87.0 – Hyperosmolality and hypernatremia

The code E87.0 should also be used in conjunction with other codes to specify the clinical details of the condition, such as:

  • R63.0 – Anorexia
  • R63.1 – Polydipsia
  • R63.2 – Polyphagia
  • R40.0 – Somnolence
  • R40.1 – Stupor
  • R40.2 – Coma
  • R56.0 – Simple febrile convulsions
  • R56.8 – Other and unspecified convulsions

For example:

  • E87.0 – Hyperosmolality and hypernatremia > R40.2 – Coma > R56.8 – Other and unspecified convulsions


Hypernatremia is a condition characterized by an abnormally high level of sodium in the blood. It can cause various signs and symptoms, such as thirst, confusion, seizures, and coma. Hypernatremia is coded as E87.0 – Hyperosmolality and hypernatremia in ICD-10-CM. This code should be used in combination with other codes to specify the cause and the manifestations of the condition.


(1) 2023 ICD-10-CM Diagnosis Code E87.0 – The Web’s Free 2023 ICD-10-CM/PCS ….
(2) 2023 ICD-10-CM Diagnosis Code E87.8 – The Web’s Free 2023 ICD-10-CM/PCS ….
(3) ICD 10 for Hypernatremia and Hyperosmolality – E87.0
(4) ICD-10-CM Code for Hyperosmolality and hypernatremia E87.0 – AAPC.


Q: What is hypernatremia?

A: Hypernatremia is a condition characterized by high levels of sodium in the blood.

Q: What are the causes of hypernatremia?

A: Causes of hypernatremia include inadequate water intake, excessive water loss (through sweating, diarrhea, or excessive urination), and certain medical conditions or medications.

Q: What are the symptoms of hypernatremia?

A: Symptoms may include excessive thirst, dry mouth, decreased urine output, fatigue, confusion, and in severe cases, seizures or coma.

Q: How is hypernatremia diagnosed?

A: Hypernatremia is diagnosed through blood tests that measure sodium levels in the blood. Additional tests may be conducted to determine the underlying cause.

Q: What is the ICD-10 code for hypernatremia?

A: The ICD-10 code for hypernatremia is E87.0.

Q: How is hypernatremia treated?

A: Treatment involves correcting the underlying cause and restoring proper fluid balance. This may include oral or intravenous fluids and addressing any medical conditions contributing to hypernatremia.

Q: Can hypernatremia be prevented?

A: Staying adequately hydrated, especially in hot weather or during illness, and monitoring sodium intake can help prevent hypernatremia. Proper management of underlying medical conditions is also important.

Q: Are there any complications associated with hypernatremia?

A: If left untreated, hypernatremia can lead to severe complications, such as brain damage, organ dysfunction, or even death. Prompt medical attention is crucial.

Q: When should I seek medical help for hypernatremia?

A: It is important to seek medical help if you experience symptoms of hypernatremia or if you suspect an imbalance in your body’s sodium levels. A healthcare professional can provide appropriate diagnosis and treatment.

Q: Are there any specific dietary recommendations for individuals with hypernatremia?

A: Dietary recommendations may vary based on individual needs and underlying causes. Consulting with a healthcare professional or registered dietitian is recommended to determine appropriate dietary modifications.

What is ICD 10 Code for Hypernatremia?
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