PTH and migraine disorder: A very small percent of cases switched from migraine to a single headache diagnosis of another type: approximately 0.5% (106//20,451), 0.4% (86/20,451), and 0.3% (72/20,451) of migraine patients received a single diagnosis of tension-type headache, PTH, and other primary headache disorder, respectively rather than being diagnosed with migraine in ICD-10-CM (Table 2, Panel B).