I think every service in the eastern half of my state uses the one I listed, and it's probably about a 90/10 split on plain english / 10 codes. Most of the 10 code usage is in the extremely rural areas. And god, don't get me started on 10 codes not being standardized. At least most of the major things seemed to be close. I haven't traveled to the western side for work, so can't speak to there. It is definitely interesting how things shake out in regards to agencies following recommendations.