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Chapter 8192Of the people with MID, almost half experienced MH problems during the four-year research period, compared with 30% of people without ID. They were younger and had a higher number of unique problems. Particular International Classification of Primary Care (ICPC) codes associated with substance abuse, psychosis, and unspecified diagnosis were more prevalent in people with MID. GPs provided significantly more consultations and types of medication prescriptions to people with both MID and MH problems compared with people of the same age and gender without ID or with MID alone. Particular antipsychotics were frequently prescribed to people with MID. In 80% of the identified patients with MID, the GP had not used the ICPC code P85 (mental retardation) to register the ID in the medical file, suggesting that the MID may not have been known to the GP.The findings indicate that more people with MID consult their GP with MH problems, compared with those without ID. Additionally, this patient group has higher healthcare needs than people without ID or with MID alone, leading to a corresponding increase in workload for the GP. Moreover, the results suggest that GPs struggle to register the MID as such, to establish the correct MH diagnosis, and, consequently, to provide appropriate treatment. In the case of severe or complex MH problems in people with MID, GPs often collaborate with MH services. Therefore, there is also a need for more information on the prevalence of MH disorders and the MH care provided to patients with MID in MH services, compared with patients without ID. In Chapter 4, a population-based retrospective database study was conducted over a three-year period, where an SN-MH service database was linked with the SN-MID database to identify 7,596 patients with MID. Similar to primary care, we observed an under-registration of MID in patients’ files in MH services. For 61% of the patients with MID, there was no record of an ID status in the MH service database. Compared with the patients without ID, patients with MID were diagnosed with different MH disorders. Particularly in the patient group with MID where the ID was not registered in the patient’s file, more patients had a ‘No or an unknown diagnosis’ compared with patients without ID. Patients with MID were younger, were provided with shorter MH trajectories, and were more likely to receive care in an addiction or forensic setting. In addition, MH service professionals Katrien Pouls sHL.indd 192 24-06-2024 16:26