OBJECTIVES: In economic evaluation patient-reported questionnaires are frequently used for data collection on medical consumption and productivity losses. The TiC-P is a comprehensive questionnaire focused on establishing costs incurred within the health care system and costs arising from production losses. The questionnaire was developed for a broad application of collecting data in patients treated in mental health care. The aim of this study is to assess the questionnaire’s feasibility and validity. METHODS: Validation included feasibility, consistency (test-retest) and reliability of reported data. Data were derived from a number of patients included in a study evaluating the cost-effectiveness of alternative feedback mechanisms during psychotherapy. Consistency of the data was assessed using Cohen’s kappa coefficients (categorical variables) and intraclass correlation coefficients (ICC) (measurements on interval level). The following values were attached to the coefficients: modest (0.21-0.40); moderate (0.41-0.60); satisfactory (0.61-0.80) and almost perfect (0.81-1.00).  Reliability was assessed comparing reported data with registered contacts with psychiatrist, psychologist or psychotherapist. Feasibility was based on response rate, and completeness of report on medication. RESULTS: Re-test analyses were based on retest questionnaires of 99 respondents.  Agreement regarding medical services was as follows: moderate: 3 items; satisfactory: 8 items; almost perfect: 1 item. Categorical items related to productivity losses included short-term and long-term absence from work and impediment at work. Agreement on these items was satisfactory. ICC’s were calculated for 7 items presenting the number of contacts with health care providers. For the remaining items on medical services, ICC’s could not be assessed due to insufficient variation in the data. Agreement was considered modest on 1 item, satisfactory on 3 items and almost perfect on 3 items. Reliability of reported and registered number of contacts was 82%. CONCLUSIONS: These preliminary results indicated that the TiC-P is a valid instrument for measuring medical consumption and productivity losses.