The authors focused attention on the problem of incorrect charges for sonographic, mammographic, angiograp- hic and cardioangiographic procedures. The most difficult chapter of revision activities is to detect errors in reports hitherto not practised by any health institution. Some mistakes in presentation occur repeatedly even when systematic attention is drawn to them.

        Key words: presenting operations for health insurance companies - mistakes in presentation - sonographic operations - mammographic and angiograhic operations