CSS in canton Basel-Stadt: twelve years of premiums
In canton Basel-Stadt, the lowest CSS premium went from CHF 452.00 a month in 2015 to CHF 575.90 in 2026 — a rise of +27.4 %. The table below places it next to the canton's cheapest insurer, year by year.
| Year | This insurer | The cheapest | Gap |
|---|---|---|---|
| 2015 | CHF 452.00 | CHF 370.80 | CHF 81.20 |
| 2016 | CHF 475.60 | CHF 402.00 | CHF 73.60 |
| 2017 | CHF 492.20 | CHF 433.30 | CHF 58.90 |
| 2018 | CHF 517.10 | CHF 454.10 | CHF 63.00 |
| 2019 | CHF 535.10 | CHF 470.20 | CHF 64.90 |
| 2020 | CHF 530.40 | CHF 486.60 | CHF 43.80 |
| 2021 | CHF 526.20 | CHF 486.30 | CHF 39.90 |
| 2022 | CHF 516.00 | CHF 481.40 | CHF 34.60 |
| 2023 | CHF 525.00 | CHF 501.60 | CHF 23.40 |
| 2024 | CHF 550.70 | CHF 544.70 | CHF 6.00 |
| 2025 | CHF 568.70 | CHF 557.50 | CHF 11.20 |
| 2026 | CHF 575.90 | CHF 575.90 | — |
Faster or slower than the rest?
CSS rose +27.4 % over the period, against +55.3 % for the cheapest insurer in the same place. The gap narrowed — which does not mean this insurer is the cheapest today, only that it climbed more slowly.
The year that hurt — The steepest year-on-year jump was 2016: +5.2 % in one go.
Figures for an adult, CHF 300 deductible, accident cover included — the only profile defined identically across all twelve years. Each year this is the lowest premium the insurer offered, all models combined.
CSS, canton by canton
Other insurers
Source: Federal Office of Public Health (FOPH), premium files from 2015 to today.