ObjectivesTelephone advice nursing is introduced in many countries with one key aim being a reduction of avoidable healthcare visits. The aim of this study was to explore whether callers to a telephone advice nursing service followed the telenurses’ recommendations, and whether there was a change in the level and trend of the rate of healthcare visits after the introduction of telephone advice nursing.DesignObservational study.SettingPrimary and secondary care in Jönköping Region, Sweden.ParticipantsTelephone advice nursing calls, 6:00–23:00, 2014–2015 (n=185 994) and outpatient healthcare visits 2012–2015 (n=6 877 266).Primary outcomeProportion of callers who visited healthcare within the time period advised by the telenurse.Secondary outcomeChange in level or trend of the overall rate of healthcare visits per 1000 persons and 4-week period after the introduction of telephone advice nursing, with subgroup analysis for primary and secondary care.Results77% of callers who were recommended either to visit healthcare within 24 hours or to ‘wait and see’ followed the recommendations. There was no significant change in level (−5.15; 95% CI −15.80 to 5.50; p=0.349) or trend (−0.24; 95% CI −0.86 to 0.38; p=0.448) of the overall rate of visits per 1000 persons and 4-week period after the introduction of telephone advice nursing. For the rate of primary care visits, an increase in level (8.01; 95% CI 6.36 to 9.66; p<0.001) and trend (1.28; 95% CI 1.17 to 1.39; p<0.001) were observed. For the rate of secondary care visits, a decrease in level (−8.77, 95% CI −14.41 to −3.13; p=0.004) and trend (−1.03, 95% CI −1.35 to −0.71; p<0.001) were observed.ConclusionsThe introduction of telephone advice nursing may have contributed to a shift in the rate of healthcare visits from secondary to primary care.