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This file contains the diagnoses recorded in hospitalisations in Dutch hospitals of persons registered in the Basic Registration Persons (BRP). The data comes from the National Basic Registration of Hospital Care (LBZ) of Dutch Hospital Data (DHD). More information on how to access the data: > https://www.cbs.nl/nl-nl/onze-diensten/maatwerk-en-microdata/microdata-zelf-onderzoek-doen ### Methodology The data on diagnoses associated with hospitalisations come from the National Basic Register of Hospital Care (LBZ). Hospitalisations (LBZBASISJJJJ) and associated diagnoses (LBZDIAGNOSENJJY) are linked to the Basic Registration Persons (BRP) in order to identify individuals. For the most part, the link takes place on the basis of pseudonyms based on Citizen Service Number (BSN) and for a small part on the combination of birth date, gender and postcode. The yield of the GBA coupling of LBZ recordings is 97.3 % in 2013, 98.8 % in 2014 and 99.2 % in 2015. This file displays only the diagnostic records associated with hospitalisations (in &LBZBASISJJJJJY#039;) associated with the BRP. As a Person ID, the variable RINPERSOON is added to the files, a meaningless and dimensionless number, which can be used to link to other CBS SSB files. Furthermore, the diagnoses from this file (LBZDIAGNOSENJJJJ) can be linked to the corresponding recording in LBZBASISJJJJ through the variable LBZID recording. Some of the hospitalisations are not fully registered in the LBZ: these recordings are recorded as incomplete records in LBZBASISJJJJJJ, but are missing from this diagnosis file, because no diagnoses are recorded in these hospital admissions.The extent to which hospitals record secondary diagnoses in addition to the main diagnosis may differ between hospitals and over the years. Overall, the registration of secondary diagnoses in the LBZ (and its predecessor the LMR) has increased significantly in recent years, especially since 2010. ### Population Diagnoses recorded during admissions in all general and academic Dutch hospitals and in two short stay categorical hospitals (cancer clinic and eye hospital).Data on the associated hospitalisation are included in the file LBZBASISJJJY; furthermore, the LBZBASISJJJJJJJJJJJJJJJJJJJJJJJJ has been registered as the main diagnosis of the admission.In the LBZDIAGNOSENJJJJJ file, all diagnoses recorded at hospitalisations have been recorded, including the secondary diagnoses. These are diagnoses recorded in daytime admissions, clinical shots and from 2015 also in & long-term observations without overnight stay '. This file contains only diagnoses associated with hospitalisations linked to the BRP (see 'Used method ' for more details). This means that there were no diagnoses in LBZDIAGNOSENYYYY in 2013 of 2.7 % of hospital admissions. This was 1.2 % in 2014 and 0.8 % in 2015. In addition, LBZDIAGNOSENJJJ did not include diagnoses of hospitalisations which are incompletely registered in the LBZ. This represents 21.4 % of hospital admissions linked to the BRP in 2013, 11.1 % in 2014 and 5.5 % in 2015.

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Diagnoses associated with hospitalisations National Basic Registration Hospital Care (01-01-2013-02-01-2013)

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