For a patient with blood in the stool and a known hemophilia A, which ICD-10-CM code best represents the underlying bleeding disorder?

For a patient with blood in the stool and a known hemophilia A, which ICD-10-CM code best represents the underlying bleeding disorder?

• A. D66
• B. D68.9
• C. D50.9
• D. D72.819

Answer: (A)

When coding, start with the condition that explains the patient’s presentation. Hemophilia A is a congenital coagulation disorder caused by factor VIII deficiency, and in ICD-10-CM the most precise code for this underlying bleeding disorder is D66, which stands for Hemophilia. This choice is better than a non-specific coagulation defect (D68.9) or unrelated conditions like iron deficiency anemia (D50.9) or a broad hematologic diagnosis (D72.819) because it identifies the exact bleeding disorder known to cause the symptoms. If the patient’s blood in the stool is the presenting symptom, it would be coded separately as a manifestation, but the underlying cause—the hemophilia—should be captured with D66.

When coding, start with the condition that explains the patient’s presentation. Hemophilia A is a congenital coagulation disorder caused by factor VIII deficiency, and in ICD-10-CM the most precise code for this underlying bleeding disorder is D66, which stands for Hemophilia. This choice is better than a non-specific coagulation defect (D68.9) or unrelated conditions like iron deficiency anemia (D50.9) or a broad hematologic diagnosis (D72.819) because it identifies the exact bleeding disorder known to cause the symptoms. If the patient’s blood in the stool is the presenting symptom, it would be coded separately as a manifestation, but the underlying cause—the hemophilia—should be captured with D66.