The only modifiers I can think of that they would be wanting is the LT/RT modifiers(which are not modifiers usually needed for this code), but the problem is depending on where the trigger point injections were given, this will not always work. If they are in someone's back, for instance. Or neck. Have you actually called Medicaid to ask them what it is they are looking for? They generally won't tell you exactly which modifier it is, but they should be able to give you a better idea.