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Original Article

The use of ICD codes to identify IBD subtypes and phenotypes of the Montreal classification in the Swedish National Patient Register

Sarita ShresthaSchool of Medical Sciences, Örebro University, Örebro, Sweden; View further author information

Ola OlénDepartment of Clinical Science and Education, Karolinska Institutet, Stockholm, Sweden; ;Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden; ;Department of Pediatric Gastroenterology and Nutrition, Sachs’ Children and Youth Hospital, Stockholm, Sweden; View further author information

Carl ErikssonClinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden; ;Department of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden;

http://orcid.org/0000-0002-1046-383X View further author information

Åsa H. EverhovDepartment of Clinical Science and Education, Karolinska Institutet, Stockholm, Sweden; ;Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden; View further author information

Pär MyrelidDivision of Surgery, Department of Clinical and Experimental Medicine, Faulty of Health Sciences, Linköping University; ;Department of Surgery, County Council of Östergötland Linköping, Linköping, Sweden;

http://orcid.org/0000-0001-7518-9213 View further author information

Isabella VisuriDepartment of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; View further author information

Jonas F. LudvigssonDepartment of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; ;Department of Pediatrics, Örebro University Hospital, Örebro University, Örebro, Sweden; ;Division of Epidemiology and Public Health, School of Medicine, University of Nottingham, Nottingham, UK; ;Department of Medicine, Celiac Disease Center, Columbia University College of Physicians and Surgeons, New York, NY, USA; View further author information

Ida SchoultzSchool of Medical Sciences, Örebro University, Örebro, Sweden; View further author information

Scott MontgomeryClinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden; ;Clinical Epidemiology and Biostatistics, School of Medical Sciences, Örebro University, Örebro, Sweden; ;Department of Epidemiology and Public Health, University College London, London, UKView further author information

Michael C. SachsClinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden; View further author information

Jonas HalfvarsonDepartment of Gastroenterology, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; Correspondence[email protected]
View further author information

, The SWIBREG Study Group,

Malin OlssonDepartment of Surgery, County Council of Östergötland, Linköping, Sweden; View further author information

Henrik HjortswangDepartment of Gastroenterology and Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden; View further author information

Jonas BengtssonDepartment of Surgery, Sahlgrenska University Hospital/Östra, Gothenburg, Sweden; View further author information

Hans StridDepartment of Internal Medicine, Södra Älvsborgs Hospital, Borås, Sweden; View further author information

Marie AnderssonDepartment of Internal Medicine, Södra Älvsborgs Hospital, Borås, Sweden; View further author information

Susanna JäghultStockholm Gastro Center, Karolinska Institutet, Stockholm, Sweden; View further author information

Michael EberhardsonDepartment of Medicine, Karolinska Institutet, Stockholm, Sweden; View further author information

Caroline NordenvallDepartment of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden; ;Department of Colorectal Cancer, Karolinska University Hospital, Stockholm, Sweden; View further author information

Jan BjörkUnit of Internal Medicine, Institute Medicine Solna, Karolinska Institutet, Stockholm, Sweden; ;Unit of Biostatistics, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden; View further author information

Ulrika L. FagerbergCenter for Clinical Research, Västmanland Hospital, Västerås, Sweden and Uppsala University, Uppsala, Sweden; ;Department of Pediatrics, Västmanland Hospital, Västerås, Sweden; ;Department of Women’s and Children’s Health, Karolinska Institutet, Stockholm, Sweden; View further author information

Martin RejlerDepartment of Medicine, Region Jönköping County Council, Jönköping, Sweden; ;Jönköping Academy for Improvement of Health and Welfare, Jönköping University, Jönköping, Sweden; View further author information

Olof GripDepartment of Gastroenterology, Skåne University Hospital, Malmö, Sweden; View further author information

Pontus KarlingDepartment of Public Health and Clinical Medicine, Umeå University, Umeå, Sweden; View further author information

Mattias BlockDepartment of Surgery, Institute of Clinical Sciences, Sahlgrenska Academy at University of Gothenburg, SSORG - Scandinavian Surgical Outcomes Research Group, Sahlgrenska University Hospital/Östra, Gothenburg, Sweden; View further author information

Eva AngeneteDepartment of Surgery, SSORG - Scandinavian Surgical Outcomes Research Group, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; ;Department of Surgery, Region Västra Götaland, Sahlgrenska University Hospital/Östra, Gothenburg, Sweden; View further author information

Per M. HellströmDepartment of Gastroenterology, Skåne University Hospital, Malmö, Sweden; View further author information

Anders GustavssonDepartment of Internal Medicine, Central Hospital, Karlstad, Sweden; ;Department of Medical Sciences, Uppsala University, Uppsala, SwedenView further author information

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Figures & data

Table 1. ICD codes assigned for phenotypes of the Montreal ClassificationTable Footnote^a.

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Table 2. Positive predictive value, sensitivity and specificity for IBD subtypes.

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Table 3. Positive predictive value, sensitivity and specificity for age at diagnosis (A1, A2 and A3).

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Table 4. Positive predictive value, sensitivity and specificity for disease behaviour, including perianal disease, and disease location among patients with Crohn’s disease.

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Table 5. Positive predictive value, sensitivity and specificity for extent of inflammation among patients with ulcerative colitis.

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The use of ICD codes to identify IBD subtypes and phenotypes of the Montreal classification in the Swedish National Patient Register

Table 1. ICD codes assigned for phenotypes of the Montreal ClassificationTable Footnote^a.

Table 2. Positive predictive value, sensitivity and specificity for IBD subtypes.

Table 3. Positive predictive value, sensitivity and specificity for age at diagnosis (A1, A2 and A3).

Table 4. Positive predictive value, sensitivity and specificity for disease behaviour, including perianal disease, and disease location among patients with Crohn’s disease.

Table 5. Positive predictive value, sensitivity and specificity for extent of inflammation among patients with ulcerative colitis.

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The use of ICD codes to identify IBD subtypes and phenotypes of the Montreal classification in the Swedish National Patient Register

Figures & data

Table 1. ICD codes assigned for phenotypes of the Montreal ClassificationTable Footnotea.

Table 2. Positive predictive value, sensitivity and specificity for IBD subtypes.

Table 3. Positive predictive value, sensitivity and specificity for age at diagnosis (A1, A2 and A3).

Table 4. Positive predictive value, sensitivity and specificity for disease behaviour, including perianal disease, and disease location among patients with Crohn’s disease.

Table 5. Positive predictive value, sensitivity and specificity for extent of inflammation among patients with ulcerative colitis.

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Table 1. ICD codes assigned for phenotypes of the Montreal ClassificationTable Footnote^a.