Discharge Abstract Database (DAD) (Canada)

Database Contact Data

Sally Lieu
Canadian Institute for Health Information
495 Richmond Road, Suite 600
Ottawa, Ontario  K2A 4H6
CANADA
Phone: +1 (613) 241-5543
Email: CAD@cihi.ca

Alternate Contact

1. Patrick Doary
Email: help@cihi.ca

2. Data inquiry form: https://www.cihi.ca/en/data-inquiry-form

References of Studies Using/Describing Database

1. Goodwin SW, Wilk P, Yuan Y, Haan M, Jairath V. Increasing Rate of Hospitalization for Inflammatory Bowel Disease Is an Age-Related Effect: A Canadian Population Study. Am J Gastroenterol. 2025 Dec 1;120(12):2840-2847.

2. Aggarwal S, Naylor K, Parekh RS, Vasilevska-Ristovska J, Dixon SN, Kang Y, Chanchlani R. Validating Recipients of Pediatric Solid Organ Transplant Using Administrative Healthcare Data. Pediatr Transplant. 2025 Dec;29(8):e70245.

3. Salem JN, Vettese R, Yamamoto JM, Koshy S, Harrison T, Stephenson N, Ronksley PE, Metcalfe A, Brennand EA, Benham JL. Development of a case definition for polycystic ovary syndrome using administrative health data: a validation study. BMJ Open. 2025 Nov 12;15(11):e097971.

4. Gilding AJ, Young I, Grant LE, Harris MA. Risk factors for acute gastrointestinal illness in a Canadian population-based linkage cohort. Epidemiol Infect. 2025 Oct 7;153:e124.

5. Emerson SD, McLinden T, Sereda P, Trigg J, Yonkman AM, Salters KA, Au S, Kooij KW, Budu MO, Lima VD, Barrios R, Hogg RS. Identifying hospitalization episodes of care among people with and without HIV in British Columbia, Canada. BMC Med Res Methodol. 2025 Jul 1;25(1):161.

6. Karbakhsh M, Rajabali F, Zheng A, Pike I. The epidemiology and deprivation profile of firearm-related injuries and deaths in British Columbia, Canada. Health Promot Chronic Dis Prev Can. 2025 Jun;45(6):286-298.

7. Liu L, Contreras G, Thompson W. Repeat self-harm hospitalizations in Canada: a survival analysis. Inj Epidemiol. 2025 May 9;12(1):26.

8. Mirzadeh P, Kuk JL, Wharton S, Ardern CI. Overweight and obesity code (E66) trends and predictors in Canada: Cross-sectional analysis of Discharge Abstract Data (DAD), 2018-2022. Obes Res Clin Pract. 2024 Sep-Oct;18(5):322-327.

9. Guilcher SJ, Bai YQ, Wodchis WP, Bronskill SE, Rashidian L, Kuluski K. What happened to the patients? Care trajectories for persons with a delayed hospital discharge during wave 1 of COVID-19 in Ontario, Canada; a population-based retrospective cohort study. PloS one. 2024 Sep 27;19(9):e0309155.

10. Sandhu N, Li B, Southern DA, Tower G, Onos D, Lochhead A, Whittle S, Quan H. Comparing terminology mappings to ICD-10 coded data in Discharge Abstract Database (DAD) in Alberta, Canada. International Journal of Population Data Science. 2024 Sep 10;9(5).

Optum De-identified Electronic Health Record (EHR) (USA)

Database Contact Data

Vito Perry
OPTUM USA
Email: vito.perry@optum.com
Phone +1 801-982-3107 

Alternate Contact

If you cannot reach the database manager, please try completing the contact form at: https://www.optum.com/en/business/insights/life-sciences/page.hub5.contact-life-sciences.html

References of Studies Using/Describing Database

1. Kalenga R, Sharp G, Teitelman AM, Makiwane M, Icard LD, Jemmott JB. A survey-based exploratory study of factors influencing women’s intentions to utilise pre-exposure prophylaxis in the Eastern Cape Province, South Africa: sociodemographic characteristics, HIV risk behaviours and transactional sex. Therapeutic Advances in Infectious Disease. 2026 Mar;13:20499361251399765.

2. Zhang B, Wu Q, Reps JM, Li L, Tong J, Lu Y, Zhang D, Ramirez-Anguita JM, Bian J, Brand MT, Falconer T. A lossless one-shot distributed algorithm for addressing heterogeneity in multi-site generalized linear models. Journal of the American Medical Informatics Association. 2026 Mar;33(3):700-9.

3. Walker K, Nazarey P, Cox C, Trivedi P, Khan A, Zaheer R, Qin Y, Rowe P. Real World Evidence: Burden Of Systemic Corticosteroid Use In Patients With CRSwNP With and Without Asthma Persists Despite Available Biologic Therapies. Journal of Allergy and Clinical Immunology. 2026 Feb 1;157(2):AB245.

4. Weis C, Grazioli F, Visonà G, Kania A, Burg MF, Horn M, Golob J, Schwab P. Developing a multi-domain EHR foundation model for predicting Hepatitis B liver disease: a clinical perspective. medRxiv. 2026 Jan 24:2026-01.

5. Chattopadhyay S, Bu F, Schuemie MJ, McLeggon JA, Westlund E, Hripcsak G, Ryan PB, Suchard MA. Comparative performance of the concurrent comparator design with existing vaccine safety surveillance approaches on real-world observational health data. medRxiv. 2026:2026-01.

6. Byrne H, Sinha S, Pradhan H, Roy S, Bhavsar M, Hu X, Costa-Scharplatz M, Shah NP. Association of elevated lipoprotein (a) with future major adverse cardiovascular events in recurrent ASCVD patients: analysis of a large US electronic health record database. European Heart Journal. 2025 Nov;46(Supplement_1):ehaf784-1646.

7. Byrne H, Sinha S, Pradhan H, Roy S, Bhavsar M, Hu X, Costa-Scharplatz M, Shah NP. Prevalence of elevated lipoprotein (a) in premature ASCVD patients and its association with major adverse cardiovascular events: analysis of a large US electronic health record database. European Heart Journal. 2025 Nov;46(Supplement_1):ehaf784-1630.

8. Coleman CI, Sood N, Chen C, Campbell AK, Ashton V. Effectiveness and Safety of Rivaroxaban Versus Warfarin in Venous Thromboembolism Patients with Comorbid Obstructive Sleep Apnea: A Retrospective Cohort Study. Clinical and Applied Thrombosis/Hemostasis. 2025 Oct;31:10760296251384278.

9. Walker K, Nazarey PP, Cox C, Zaheer R, Qin Y. Disease Burden of Asthma in African Americans in the US: Real World Data Analysis Using Immunolab, A Rwe Generation Platform. American Journal of Respiratory and Critical Care Medicine. 2025 May;211(Supplement_1):A1471-.

10. Rao GA, Shoaibi A, Makadia R, Hardin J, Swerdel J, Weaver J, Voss EA, Conover MM, Fortin S, Sena AG, Knoll C. CohortDiagnostics: phenotype evaluation across a network of observational data sources using population-level characterization. Plos one. 2025 Jan 16;20(1):e0310634.

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