Extracts all claims containing specified ICD-9 or ICD-10 diagnosis codes from institutional billing data for the selected years. The data may be stored in CSV, SAS, or Parquet format. The function automatically loads and combines matching files and can optionally filter to a subset of USRDS_IDs.
Arguments
- icd_codes
Optional. Character vector of ICD diagnosis codes (without periods). If NULL (default), returns all diagnosis claims for the selected years (and USRDS_IDs, if specified).
- years
Integer vector of calendar years to include.
- usrds_ids
Optional. Vector of USRDS_IDs to restrict the output to specific patients.
Examples
if (FALSE) {
# ICD-9 and ICD-10 codes for Cryptococcosis (no periods)
cryptococcus_icd <- c("1175", "B45")
# Retrieve claims for all patients in selected years
result <- get_IN_ICD(icd_codes = cryptococcus_icd, years = 2013:2018)
# Retrieve all diagnosis claims for selected patients
result_all <- get_IN_ICD(icd_codes = NULL, years = 2015, usrds_ids = c(100000001, 100000002))
}