Brown the Italian sausage with the onion, carrot, celery, and garlic in a large stockpot or Dutch oven.
When the sausage is cooked through and crumbled, add the Italian seasoning, diced tomatoes, kidney beans, green beans, and chicken broth. Stir to mix. Cook over medium high heat until the mixture comes to a boil, then reduce heat to low and simmer for one hour.
Add the pasta to the pot and continue cooking another 10 to 15 minutes, until the pasta is cooked through.