Hattha Thai Spa is not yet approved from health insurer, what means, you have to check it with your insurer yourself whether these costs are covered. If covered, then you should ask for a written cost approval and check if there a is a cost limit per year. Massage for wellness purposes are mostely not covered by insurer.

However the following insurer

SWICA , KPT , innova , Aquilana , Sumiswalder , vita surselva Ilanz , rhenusana, Groupe Mutuel plus Mutuel Krankenversicherung AG, Avenir Krankenversicherung AG, Easy Sana Krankenversicherung AG,
Philos Krankenversicherung AG, AMB Versicherungen, Supra-1846 AG , Suva – Militärversicherung , CONCORDIA – Natura plus , Sanitas Krankenversicherung , Sodalis Gesundheitsgruppe – Sodalis Spitalversicherung , sanavals Gesundheitskasse , Cassa da malsauns LUMNEZIANA, Krankenkasse Birchmeier, Krankenkasse Visperterminen,

cover a part of the costs with the corresponding supplementary insurance.