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jackwasey / icd

Fast ICD-10 and ICD-9 comorbidities, decoding and validation in R. NB use main instead of master for default branch.
https://jackwasey.github.io/icd/
GNU General Public License v3.0
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“0449” is not defined in ICD-9, yet appears in Quan Elixhauser comorbidities #106

Closed jackwasey closed 7 years ago

jackwasey commented 8 years ago

reported via email:

Dear Jack,

Thank you for your work maintaining the package ICD. I am using it for my projects.

I would like to let you know that the ICD9 code “0449” is not defined or explained. However, the code is listed under Quan_Elix comorbidities for the category HIV.

Thank you for your attention.

Regards, Andrey

jackwasey commented 8 years ago

Initial thought is that Quan-Elixhauser is not based on ICD-9-CM (which has fewer definitions for HIV than the WHO system). Quan works in Canada, yet his comorbidity maps are used globally.

We should look into this discrepancy.

Current the package does not have ICD-9 (WHO) edition, although this is now not restricted in its distribution. Almost always, ICD-9-CM has more detail than WHO; this may be the only exception.

jackwasey commented 7 years ago

Yes, this is indeed because HIV in ICD-9-CM is a subset of WHO's ICD-9. Mostly ICD-9-CM is a superset, but this is an exception. The co-ormidity functions should catch it, though. See other similar issues: solution likely to be clarifying whether ICD-9 or ICD-9-CM is being used (at least if there is a discrepancy).