Nontraumatic hematoma of soft tissue

This code signifies a localized collection of blood outside of blood vessels within the soft tissues, such as muscle, subcutaneous tissue, or fascia, that is not caused by an external injury or trauma. It represents a spontaneous or internally caused extravasation of blood.

Use this code for hematomas resulting from underlying medical conditions like coagulopathies, anticoagulant therapy, ruptured aneurysms, or spontaneous vessel rupture. Documentation should clearly state the absence of trauma as the etiology and describe the location and nature of the hematoma.

• Differentiate carefully from traumatic hematomas (S00-S99 codes) where an external force is the cause.
• Always code any underlying condition causing the nontraumatic hematoma, such as a bleeding disorder, as a primary or secondary diagnosis.
• Specify the exact anatomical site of the hematoma if more detail is available in the documentation (e.g., M79.818 for other specified sites).