M09.2: Juvenile arthritis in ulcerative colitis

Juvenile arthritis in ulcerative colitis, as described by ICD-10 code M09.2, is a specific type of arthritis that occurs in children who are diagnosed with ulcerative colitis. Ulcerative colitis is an inflammatory bowel disease that causes long-lasting inflammation and ulcers in the digestive tract. When arthritis occurs alongside this condition, it can lead to inflammation in the joints as well as the eyes, skin, and other organs, similar to how ulcerative colitis affects the colon. Usually, this type of arthritis presents with symptoms such as joint pain, swelling, redness and decrease in joint movement, which could affect daily activities. It's also common for these symptoms to flare up and then subsides periodically. However, the joint symptoms often correspond to the level of intestinal inflammation - when the ulcerative colitis symptoms worsen, so do the arthritis symptoms. Though the exact cause of this combination of conditions is unclear, it is thought to involve an abnormal response of the immune system.