Dental According to the WHO classification of Periradicular diseases periapical abscess with sinus to the oral cavity is coded as: A K04.60 B KO4.61 C K04.62 D KO4.63 💡 Explanation According to the WHO classification of Periradicular diseases periapical abscess with sinus to the oral cavity is coded as: ✓ Correct Answer: C. K04.62