Phone
- Customer service0844 277 277Source ↗
- Medical advice around the clock+41 58 277 77 77Source ↗
- Customer service: Monday to Friday, 8 am–6 pm
Addresses
The website does not give a separate cancellation address; this is the general postal address. Source, retrieved on 25.09.2026.
Online channels
- Customer portalmyCSS customer portalmentioned on the website ↗
- AppmyCSS appmentioned on the website ↗
Website: www.css.ch
Not found on the website: emergency number abroad.
Frequently asked questions
What is the phone number of CSS?
Customer service: 0844 277 277 (Monday to Friday, 8 am–6 pm). Source: the insurer’s official website, retrieved on 25.09.2026. You’ll find more numbers and the online channels further up this page.
How do I reach CSS in an emergency abroad?
The CSS contact page does not give a separate emergency number for abroad. The number is usually on your health insurance card; if life is in danger, call the local emergency number, in the EU 112.
What is the address of CSS?
Postal address per the website: CSS Kranken-Versicherung AG, Tribschenstrasse 21, Postfach 2568, 6002 Luzern. For cancelling basic insurance: CSS Kranken-Versicherung AG, Tribschenstrasse 21, Postfach 2568, 6002 Luzern (general postal address, the website does not give a separate cancellation address, retrieved on 25.09.2026).
Sources
- FOPH, register of approved health insurers, as of 01.01.2026priminfo.admin.ch
- FOPH, health insurance premiums 2011–2026 (opendata.swiss)opendata.swiss
- FOPH, supervisory data for compulsory health insurance (T 5.01), data as of 22.05.2025bag.admin.ch
- FOPH, KVG solvency test (KVD, reserves of health insurers)opendata.swiss
- CSS: website (address), retrieved on 25.09.2026css.ch
- CSS: website (physician search), retrieved on 25.09.2026css.ch
- CSS: website (contact), retrieved on 25.09.2026css.ch