Study objectives: To analyse office consultations with elderly people in general practice: reason for encounter, diagnostic indications for prescribing drugs, and what drugs are prescribed for the different diagnoses. Design: Cross-sectional survey. Setting: The Norwegian county of Møre and Romsdal. Participants: In 1988 and 1989 the general practitioners recorded all encounters with patients over a period of two months. The participation rate was close to 100%, and we report data from 10,850 office consultations with elderly patients (65 years and older). Main results: 60% of the consultations involved female patients, mean age was 74 years. One of three consultations were for new diagnoses, two thirds were follow-ups. The most common diagnostic groups were cardiovascular (28%), musculoskeletal (13%), psychiatric (8%) and respiratory diseases (8%). Almost 10% of all consultations were for hypertension. Drugs were prescribed during 56% of all consultations. 27% of all prescriptions were for cardiovascular drugs, and 25% were for the central nervous system. The 20 most common diagnoses constituted more than half of all the diagnoses, and the ten most common drugs (therapeutic groups) constituted almost 70% of all prescriptions. Conclusion: In the context of quality assurance large benefits may be gained even if focus is put on rather few diagnoses and drugs.