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Mapping three versions of the international classification of diseases to categories of chronic conditions

Authors:

Amani F. Hamad, Viktoriya Vasylkiv, Lin Yan, Ridwan Sanusi, Olawale Ayilara, Joseph A. Delaney, Elizabeth Wall-Wieler, Mohammad Jafari Jozani, Pingzhao Hu, Shantanu Banerji, and Lisa M. Lix

Date:

2021
Journal
International Journal of Population Data Science

Abstract:

Administrative health data capture diagnoses using the International Classification of Diseases (ICD), which has multiple versions over time. To facilitate longitudinal investigations using these data, we aimed to map diagnoses identified in three ICD versions – ICD-8 with adaptations (ICDA-8), ICD- 9 with clinical modifications (ICD-9-CM), and ICD-10 with Canadian adaptations (ICD-10-CA) – to mutually exclusive chronic health condition categories adapted from the open source Clinical Classifications Software (CCS).

We developed crosswalks for three ICD versions (ICDA-8, ICD-9-CM, and ICD-10-CA) to 130 clinically meaningful categories of chronic health conditions by adapting the CCS classification. These crosswalks will benefit chronic disease studies spanning multiple decades of administrative health data.