ICD 9 Acute Gastroenteritis: Codes, Symptoms, and Treatment

ICD 9 Acute Gastroenteritis: Codes, Symptoms, and Treatment

Acute gastroenteritis is a common condition that affects millions yearly, leading to inflammation of the stomach and intestines. It typically causes nausea, vomiting, stomach pain, and diarrhea — symptoms that can appear suddenly and be quite distressing. 

Though usually mild and short-term, understanding gastroenteritis’s causes, treatment, and classification helps you manage it effectively and prevent recurrence.

What Is ICD 9 Acute Gastroenteritis?

Gastroenteritis is inflammation of the stomach (gastro) and intestines (-enteritis), resulting in digestive tract irritation. The condition can be caused by viral, bacterial, or parasitic infections or exposure to toxins and certain medications.

In the ICD-9 medical classification, acute gastroenteritis is coded as 558.9, categorized under “Noninfectious gastroenteritis and colitis, unspecified.” This coding is mainly used for diagnosis documentation and billing in healthcare systems.

While it often resolves independently within a few days, severe or persistent cases may require medical attention to prevent dehydration or complications.

Common Symptoms of Gastroenteritis

The hallmark symptoms include:

• Diarrhea — frequent loose stools, sometimes watery.
• Nausea and vomiting — sudden onset of stomach upset.
• Abdominal pain or cramps.
• Low-grade fever and chills.
• Fatigue, loss of appetite, and mild dehydration.

Symptoms usually develop within 24 hours of exposure and last one to three days, though bacterial forms can last longer.

Causes of Acute Gastroenteritis

1. Viral Infection (Most Common)

Viruses are responsible for the majority of acute gastroenteritis cases.

Common culprits include:

• Norovirus – spreads easily through contaminated food or surfaces.
• Rotavirus often affects infants and young children.
• Adenovirus and Astrovirus are milder forms and are common in children.

2. Bacterial Infection

Bacteria can enter the digestive system through contaminated food or water.

Frequent causes include:

• E. coli
• Salmonella
• Shigella
• Campylobacter
• Clostridium difficile (C. diff)

3. Parasitic or Fungal Infections

Less common but possible, especially in areas with poor water and sanitation.

Parasites such as Giardia lamblia and Cryptosporidium may trigger long-lasting symptoms.

4. Chemical or Medication-Induced Gastroenteritis

Excessive alcohol, NSAIDs (like ibuprofen), and toxins can irritate the gut lining.

Certain chemotherapy drugs may also cause gastroenteritis as a side effect.

Diagnosis and ICD-9 Code Reference

When necessary, healthcare professionals diagnose gastroenteritis through a review of symptoms, medical history, and stool tests.

ICD-9 Code 558.9 is used explicitly for acute noninfectious gastroenteritis — meaning inflammation not directly caused by a pathogen but possibly by toxins, drugs, or allergic reactions. Other ICD-9 codes apply for infectious cases, depending on the microbe involved.

Treatment and Management

Most people recover with rest, hydration, and supportive care. Treatment focuses on easing symptoms and preventing dehydration.

Self-Care and Home Remedies

• Drink plenty of fluids: water, clear soups, or electrolyte solutions.
• Eat bland foods like toast, rice, bananas, or boiled potatoes.
• Avoid dairy, caffeine, alcohol, and spicy foods during recovery.
• Get enough rest to help your immune system heal.

Medical Treatment

If dehydration is severe or symptoms persist, medical treatment may include:

• Oral rehydration salts (ORS) or IV fluids.
• Antiemetics to control vomiting.
• Antibiotics for confirmed bacterial infections (only if prescribed).
• Probiotics to restore healthy gut bacteria balance.

At Time Pharmacy UK, patients can consult pharmacists for safe over-the-counter options to manage mild cases and protect gut health.

Complications and When to See a Doctor

While most cases are mild, contact a healthcare provider if you experience:

• Blood in vomit or stool.
• Persistent diarrhea (more than 3 days).
• High fever or severe abdominal pain.
• Signs of dehydration (dizziness, dry mouth, dark urine).

Untreated dehydration can become life-threatening, especially for children and older adults.

Canine Gastroenteritis Symptoms

Gastroenteritis doesn’t just affect humans — it’s also common in dogs.

ICD 9 Acute Gastroenteritis is inflammation of a dog’s stomach and intestines, often caused by eating spoiled food, infection, or stress.

Common canine gastroenteritis symptoms include:

• Vomiting or retching.
• Diarrhea, sometimes with mucus or blood.
• Loss of appetite.
• Fatigue and dehydration.
• Abdominal discomfort or bloating.

Most dogs recover within 24–48 hours with proper hydration and a bland diet. However, if your pet’s symptoms persist or worsen, a vet visit is necessary to rule out infection, parasites, or toxins.

Prevention Tips

You can prevent most gastroenteritis cases by:

• Washing hands regularly and thoroughly.
• Storing and cooking food safely.
• Avoiding unclean water, especially while travelling.
• Cleaning pet bowls and feeding areas to reduce bacteria spread.
• Keep alcohol and medications out of reach of pets and children.

Prognosis and Recovery

Most people with ICD 9 Acute Gastroenteritisrecover completely within a few days. Early hydration and rest are key. Your doctor may recommend stool tests or food intolerance checks for recurring or chronic symptoms.

Pets usually recover within days, too, but persistent canine gastroenteritis might require a change in diet or vet-prescribed medication.

Final Thoughts

ICD 9 Acute Gastroenteritis, whether caused by infection or irritation, can be uncomfortable but is usually self-limiting. Understanding its ICD-9 classification, symptoms, and treatment helps ensure proper care.

Time Pharmacy UK is dedicated to providing professional healthcare support, from medication advice to convenient online prescription delivery — helping you and your family recover faster and stay well.