K92.1

Melena

Melena is a clinical sign characterized by the passage of black, tarry, and foul-smelling stools, which typically indicates hemorrhage from the upper gastrointestinal (GI) tract. The distinct black appearance and sticky consistency are the result of hemoglobin being chemically altered by gastric acid, digestive enzymes, and intestinal bacteria as it passes through the digestive system. For melena to be clinically apparent, a minimum of 50 to 100 mL of blood loss is usually required. The most common site of bleeding is proximal to the ligament of Treitz, specifically the esophagus, stomach, or duodenum. However, melena can occasionally occur due to bleeding in the small intestine or the right side of the colon if the intestinal transit time is significantly delayed. Prompt evaluation is necessary to stabilize the patient and identify the underlying source of the hemorrhage.

Clinical Symptoms

  • Black, tarry, or coal-colored stools
  • Sticky or 'tar-like' stool consistency
  • Foul, pungent, or metallic stool odor
  • Hematemesis (vomiting of red blood or 'coffee-ground' material)
  • Epigastric or abdominal pain
  • Dizziness or lightheadedness
  • Orthostatic hypotension (blood pressure drop upon standing)
  • Tachycardia (rapid heart rate)
  • Syncope or fainting
  • General fatigue or weakness
  • Pallor (pale skin and mucous membranes)
  • Shortness of breath (exertional dyspnea)
  • Anemia-related symptoms

Common Causes

  • Peptic ulcer disease (gastric or duodenal ulcers)
  • Esophageal varices (associated with portal hypertension and cirrhosis)
  • Gastritis (inflammation of the stomach lining)
  • Mallory-Weiss tears (mucosal lacerations at the gastroesophageal junction)
  • Esophagitis (severe inflammation of the esophagus)
  • Gastric cancer or esophageal cancer
  • Vascular malformations (e.g., angiodysplasia, Dieulafoy's lesion)
  • Use of Non-steroidal anti-inflammatory drugs (NSAIDs)
  • Use of anticoagulants or antiplatelet medications
  • Portal hypertensive gastropathy
  • Gastrointestinal stromal tumors (GIST)

Documentation & Coding Tips

Differentiate between melena and other forms of gastrointestinal bleeding like hematochezia to ensure proper anatomical localization.

Example: Patient presents with black, tarry, foul-smelling stools for 48 hours. Denies bright red blood per rectum. Clinical picture is highly suggestive of melena from an upper gastrointestinal source. Hemoglobin is 9.8 g/dL, down from baseline of 13.5 g/dL, indicating acute posthemorrhagic anemia (D62). Patient has a history of chronic NSAID use for rheumatoid arthritis.

Billing Focus: Anatomical specificity of the stool appearance (melena vs hematochezia) supports K92.1 and justifies the use of upper endoscopy CPT codes.

Explicitly document the presence or absence of hemodynamic instability or orthostatic changes associated with the melena.

Example: Physical exam reveals orthostatic hypotension with a systolic drop of 25 mmHg upon standing and a compensatory heart rate increase of 20 bpm. Patient reports lightheadedness and significant melena. These findings indicate potential hypovolemic shock (R57.1) due to acute GI hemorrhage.

Billing Focus: Documentation of hypotension and tachycardia supports a higher level of Medical Decision Making (MDM) and potential 99215 or emergency level billing.

Link the melena to any long-term medication use such as anticoagulants, antiplatelets, or NSAIDs.

Example: Melena is likely secondary to erosion from long-term daily aspirin 325mg and Naproxen 500mg BID use for chronic pain management. Stools are positive for digested blood. Anticoagulant status documented as long-term use of Warfarin (Z79.01) for atrial fibrillation.

Billing Focus: Specifying the causative agent allows for secondary codes (e.g., Z79.01, T39.315A) which provide a more complete clinical picture for medical necessity.

Specify the suspected or confirmed source of the bleeding if known, rather than relying solely on the symptom code.

Example: Initial diagnosis of melena (K92.1) updated following EGD to chronic gastric ulcer with hemorrhage (K25.4). Source identified as a 1cm clean-based ulcer in the gastric antrum. No active spurting at time of procedure.

Billing Focus: Updating a symptom code (K92.1) to a definitive diagnosis code (K25.4) ensures maximum specificity for reimbursement and avoids denials for lack of specificity.

Document the results of diagnostic tests such as fecal occult blood or urea breath tests to support the clinical diagnosis.

Example: Stool guaiac is strongly positive. Urea breath test is positive for H. pylori infection. Patient presents with classic melena and epigastric pain. Diagnosed with H. pylori gastritis with hemorrhage.

Billing Focus: Clinical evidence like a positive guaiac or H. pylori test justifies the clinical rationale for the K92.1 diagnosis and subsequent treatment.

Relevant CPT Codes

Related Diagnoses

Hierarchy