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medicalrisk

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.

Data Sources

For implementation, testing, and examples several external data sources are used:

• ICD-9-CM code list from CMS
• Vermont Uniform Hospital Discharge Data Set
• Risk Stratification Index

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.
Health stats visible at Monitor.