Get Hierarchical Condition Codes (HCC)

Source: R/hcc.R

Applying CMS Hierarchical Condition Categories comorbid_hcc works differently from the rest of the comorbidity assignment functions. This is because CMS publishes a detailed ICD to Condition Category mapping including all child ICD codes. While these mappings were the same for 2007-2012, after 2013 there are annual versions, so date must be taken into consideration. Also, there is a many:many linkage between ICD and Condition Categories (CC). Once CCs are assigned, a series of hierarchy rules (which can also change annually) are applied to create the HCCs.

comorbid_hcc(
  x,
  date_name = "date",
  visit_name = get_visit_name(x),
  icd_name = get_icd_name(x)
)

icd9_comorbid_hcc(x, date_name = "date", visit_name = NULL, icd_name = NULL)

icd10_comorbid_hcc(x, date_name = "date", visit_name = NULL, icd_name = NULL)

Arguments

x

data frame with columns for patient/visit ID, ICD code and date
date_name

the name of the column representing the date of each record. Needed because each year there is a different ICD9/10 to CC mapping). Default value is 'date'.
visit_name

The name of the column in the data frame which contains the patient or visit identifier. Typically this is the visit identifier, since patients come leave and enter hospital with different ICD-9 codes. It is a character vector of length one. If left empty, or NULL, then an attempt is made to guess which field has the ID for the patient encounter (not a patient ID, although this can of course be specified directly). The guesses proceed until a single match is made. Data frames may be wide with many matching fields, so to avoid false positives, anything but a single match is rejected. If there are no successful guesses, and visit_id was not specified, then the first column of the data frame is used.
icd_name

The name of the column in the data.frame which contains the ICD codes. This is a character vector of length one. If it is NULL, icd9 will attempt to guess the column name, looking for progressively less likely possibilities until it matches a single column. Failing this, it will take the first column in the data frame. Specifying the column using this argument avoids the guesswork.

Functions

  • icd9_comorbid_hcc: Get HCCs from a data frame of ICD-9 codes

  • icd10_comorbid_hcc: Get HCCs from a data frame of ICD-10 codes

See also

Other comorbidity computations: comorbid()

Other comorbidities: comorbid(), icd10_map_ahrq_pcs, icd9_map_ahrq, icd9_map_elix, icd9_map_hcc, icd9_map_pccc, icd9_map_quan_deyo, icd9_map_quan_elix, icd9_map_single_ccs