Development of an ICD Coding Definition for Inflammatory Bowel ...

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4.6 Linkage with administrative databases Our cohort of IBD, non-IBD, and possible IBD patients was linked to the Calgary Health Region administrative databases using their unique PHNs. Linkage was done separately to PC (FY1995-FY2004), IP (FY1995-FY2004) and ACCS (FY1996-FY2004) databases. All the data files were transformed from SAS into STATA datasets and all of the analysis was done with STATA software version 9.0 (Stata Corp, College Station, Tex). In each database, any record with an IBD diagnostic ICD code in any diagnosis field was identified. A preliminary analysis was done regarding the frequency and periodicity of IBD codes in each database. In addition the procedures that led to a diagnosis of IBD were retrieved in the ACCS database. The status of the IBD diagnostic code in IP database was also determined (i.e. most responsible diagnosis or not). A pooled dataset was developed out of IP, ACCS, and PC databases with the following variables: • PHNs • IBD diagnostic code(s) in IP database for each PHN • Assignment date(s) of the IBD code(s) in IP database IBD for each PHN • IBD diagnostic code(s) in ACCS database for each PHN • Assignment date(s) of the IBD diagnostic code(s) in IP database for each PHN • IBD diagnostic code(s) in PC database for each PHN • Assignment date(s) of the IBD diagnostic code(s) in PC database for each PHN • IBD status for each PHN (retrieved from the EndoPro search) 22
4.7 Preliminary development of the administrative definitions for IBD Depending on the number of the IBD diagnostic codes in the administrative databases of IP, PC, and ACCS, we developed several administrative definitions within different time frames: Condition {(x IBD codes in IP within t years) OR (y IBD codes in PC within t years) OR (z IBD codes in ACCS within t years)} = True Patient has IBD A computerized algorithm was developed to process the data based on Flowchart 1. 23
Page 1 and 2: UNIVERSITY OF CALGARY DEVELOPMENT O
Page 3 and 4: Abstract INTRODUCTION: To facilitat
Page 5 and 6: Dedication To my parents and my sis
Page 7 and 8: 4.3.1 Computerized search..........
Page 9 and 10: List of Tables Table1. Incidence an
Page 11 and 12: List of Abbreviations Symbol Defini
Page 13 and 14: Chapter One: INTRODUCTION Crohn‘s
Page 15 and 16: 2.1 Inflammatory Bowel disease Chap
Page 17 and 18: are usually apparent. Potentially l
Page 19 and 20: Incidence and prevalence rates of I
Page 21 and 22: contact in 1989 or later, to allow
Page 23 and 24: significant condition of the patien
Page 25 and 26: Young et al.[36] found that agreeme
Page 27 and 28: 3.1 Significance Chapter Three: Sig
Page 29 and 30: 4.1 Summarized design Chapter Four:
Page 31 and 32: 4.2.4 Ambulatory Care Classificatio
Page 33: 4.4 Retrieving the personal health
Page 37 and 38: Each time frame 1 (i.e. ”t‘ in
Page 39 and 40: 4.7.1 Sensitivity Sensitivity (true
Page 41 and 42: hospitals were reviewed for each pa
Page 43 and 44: final two definitions was founded o
Page 45 and 46: Figure 1. Distribution of the proce
Page 47 and 48: 5.4.1 IP database (FY 1994 œ FY 20
Page 49 and 50: 5.4.2 PC database (FY 1995 œ FY 20
Page 51 and 52: Diagram 4. Frequency of ACCS contac
Page 53 and 54: Table 3. 2×2 contingency table and
Page 55 and 56: within 5 years“. Of 137 false pos
Page 57 and 58: —IP≥1 or PC≥5 or ACCS≥2 wit
Page 59 and 60: 5.6.2 False negative patients Defin
Page 61 and 62: definitions were selected as our fi
Page 63 and 64: • Incomplete documentation of lin
Page 65 and 66: 94.5% of our subjects were regarded
Page 67 and 68: prevalence of IBD in the Calgary He
Page 69 and 70: with no flare in the last 10 years
Page 71 and 72: • At least two independent and se
Page 73 and 74: FP rate (i.e. 1-specificity or ). T
Page 75 and 76: CD, IC patients who become CD or UC
Page 77 and 78: 6.5 Limitations When extrapolating
Page 79 and 80: egions that do not have access to t
Page 81 and 82: 17. Trallori, G., et al., A populat
Page 83 and 84: APPENDIX 1. INTERNATIONAL CLASSIFIC
Page 85 and 86:
556.8 Other ulcerative colitis 556.
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• ICD-10-CA Enteritis, NOS, diete
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APPENDIX 2. SEARCH TERMS IN ENDOPRO
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INVOLVEMENT Shade the corresponding
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APPENDIX 4. ETHICAL APPROVAL 81
Page 96 and 97:
IP = 1 PC =3 ACCS =2 IP = 1 PC = 3
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IP = 1 PC = 5 ACCS = 2 IP = 1 PC =
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IP = 2 PC = 2 ACCS = 2 IP = 2 PC =
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IP = 2 PC = 4 ACCS = 2 IP = 2 PC =
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IP = 2 PC = 6 ACCS = 2 IP = 2 PC =
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IP = 1 PC =4 IP = 1 PC = 5 Criteria
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IP = 2 PC = 3 IP = 2 PC = 4 Criteri
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APPENDIX 7. 2×2 TABLES AND TEST CH
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• Definition —IP≥1 or PC≥4
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IBD patients had a median number of
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Diagram 8. Frequency of ACCS contac
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IP = 1 PC =3 ACCS =2 IP = 1 PC = 3
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IP = 1 PC = 5 ACCS = 2 IP = 1 PC =
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IP = 2 PC = 2 ACCS = 2 IP = 2 PC =
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IP = 2 PC = 4 ACCS = 2 IP = 2 PC =
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IP = 2 PC = 6 ACCS = 2 IP = 2 PC =
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IP = 1 PC =4 IP = 1 PC = 5 Criteria
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IP = 2 PC = 3 IP = 2 PC = 4 Criteri
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APPENDIX 11. 2×2 TABLES AND TEST C
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