ICD Code K65.9

ICD code K65.9 is peritonitis that is not specified as acute or chronic and does not indicate a specific cause.

1. Presence of abdominal pain, often severe and diffuse

2. Signs of peritoneal irritation, such as rebound tenderness or guarding

3. Fever and/or chills

4. Nausea and vomiting

5. Abdominal distension

6. Reduced or absent bowel sounds

7. Laboratory findings indicating infection or inflammation (elevated white blood cell count, elevated C-reactive protein)

8. Imaging studies (such as ultrasound or CT scan) showing evidence of peritoneal inflammation without a clearly identified cause

9. No specific underlying etiology identified after appropriate diagnostic evaluation

Relevant CPT codes that may be used to treat ICD code K65.9 include:

- 49020 – Drainage of peritoneal abscess, open

- 49021 – Drainage of peritoneal abscess, percutaneous

- 49060 – Drainage of intra-abdominal abscess, postoperative, open

- 49080 – Peritoneal lavage, including imaging guidance

- 49010 – Exploration, abdominal cavity, with or without biopsy(s)

- 99221–99223 – Initial hospital care (evaluation and management)

- 99231–99233 – Subsequent hospital care (evaluation and management)

- 99468–99476 – Critical care services (for neonates and pediatric patients, if applicable)

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