The quality of severe mental disorder diagnoses in a national health registry as compared to research diagnoses based on structured interview

Table 2 Concordance^a between ICD-10 diagnoses in the Norwegian Patient Registry (NPR) and DSM-IV diagnosis in the Thematically Organized Psychosis (TOP) study

TOP group		SCZ (n = 537)		DEL (n = 48)		SCA (n = 118)		BIP (n = 408)
NPR diagnoses	ICD-10-codes	n	%	n	%	n	%	n	%
Schizophrenia	F20	452	84.2	9	18.8	40	33.9	10	2.5
Delusional disorder	F22	54	10.1	33	68.8	9	7.6	11	2.7
Schizoaffective disorder	F25	38	7.1	0	0	90	76.3	20	4.9
Bipolar disorder	F30–F31	25	4.7	5	10.4	24	20.3	320	78.4

Data obtained from NPR for the period 2008–2013 on patients recruited to TOP between 18.10.2002 and 01.09.2014
Abbreviations: ICD-10, International Classification of Diseases, 10th revision, DSM-IV Diagnostic and Statistical Manual of Mental Disorders, 4th edition, SCZ schizophrenia, DEL delusional disorder, SCA schizoaffective disorder, BIP bipolar disorder (type I, type II, and bipolar disorder not otherwise specified)
^a Percentage of patients within each of the four TOP groups that were registered with each of the four equivalent ICD-10 categories at least once in the NPR during 2008–2013

ISSN: 1471-244X