Non-principals are to be given their own prescribing numbers under Department of Health plans which could be in place by April.
The move is aimed at giving GP principals more accurate assessments of their practice's drugs spending and provide more information for non-principals' appraisal.
Prescription pads are likely to have two numbers, one belonging to a partner in a given practice and the other to the non-principal.
Dr Richard Fieldhouse, chief executive of the National Association of Non-Principals, said: 'At the moment we use another GPs' prescribing pads.
'With their own prescribing numbers non-principals can measure their quality of care. It's one more thing to bring to their appraisal.'