治疗费 is specifically the cost of medical treatment (procedures, medication, follow-ups). Compare with
医疗费 (yīliáofèi, 'medical expenses', broader, including hospital stays, exams) and
医药费 (yīyàofèi, 'medical and drug fees'). When discussing crowdfunding for an illness,
治疗费 and
医药费 are the most common phrasings.
