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medicalrisk is a collection of tools and data for performing patient-level medical risk adjustment using administrative data.
The data sets include icd9cm_charlson and
icd9cm_elixhauser, which are data frames that map ICD-9-CM
codes to comorbidities, using the Charlson and Elixhauser
classifications respectively. The mapping comes from the paper by Quan in
2005, and uses the CMS
ICD-9-CM table.
With a properly formatted source data frame of patients and ICD-9-CM
values, the cast or dcast methods can be used
to generate comorbidity tables.
The add_charlson_index_df method will calculate the
Charlson Comorbidity Index for each patient.
For data sources that present ICD-9-CM codes as a comma-separated
listing, the melt_icd9list method will convert such data
tables into a one-row-per-code format suitable for join or
merge to the icd9cm_* tables.
For implementation, testing, and examples several external data sources are used:
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.