Note : The following fifth-digit subclassification is for use with category 346: {0 without
mention of intractable migraine without mention of status migrainosus; {without mention
of refractory migraine without mention of status migrainosus}; 1 with intractable
migraine, so stated, without mention of status migrainosus; {with refractory migraine,
so stated, without mention of status migrainosus}; 2 without mention of intractable
migraine with status migrainosus; {without mention of refractory migraine with status
migrainosus}; 3 with intractable migraine, so stated, with status migrainosus; {with
refractory migraine, so stated, with status migrainosus}};