Generating vocabulary based codelists"
In CodelistGenerator: Identify Relevant Clinical Codes and Evaluate Their Use

knitr::opts_chunk$set(
  collapse = TRUE,
  comment = "#>"
)

library(CDMConnector)
if (Sys.getenv("EUNOMIA_DATA_FOLDER") == "") Sys.setenv("EUNOMIA_DATA_FOLDER" = tempdir())
if (!dir.exists(Sys.getenv("EUNOMIA_DATA_FOLDER"))) dir.create(Sys.getenv("EUNOMIA_DATA_FOLDER"))
if (!eunomia_is_available()) downloadEunomiaData()

For this vignette we are going to produce codelists based on the OMOP CDM vocabulary tables. First we will create medication codelists based on ATC classifications and drug ingredients. Second, we will create condition codes based on ICD10 chapters and subchapters.

Medication codelists based on drug ingredients

The function getDrugIngredientCodes() can be used to generate the medication codelists based around ingredient codes. Here, for example, we will create a codelist using ingredient codes only for acetaminophen. We´ll do this using the Eunomia example data.

library(CDMConnector)
library(CodelistGenerator)
library(dplyr)
library(tidyr)

db <- DBI::dbConnect(duckdb::duckdb(), 
                     dbdir = CDMConnector::eunomia_dir())
cdm <- cdm_from_con(
  con = db,
  cdm_schema = "main", 
  write_schema = "main"
)

By default the function will return a codelist. As Eunomia only contains a subset of the OMOP CDM vocabularies we see a few codes returned, but we would get many more if working with the full set of vocabularies.

acetaminophen_codes <- getDrugIngredientCodes(
  cdm = cdm,
  name = "acetaminophen"
)

acetaminophen_codes
acetaminophen_codes$acetaminophen

Alternatively, instead of returning a codelist with only the concept IDs we could get them with details such as their name and domain.

acetaminophen_codes_with_details <- getDrugIngredientCodes(
  cdm = cdm,
  name = "acetaminophen",
  type = "codelist_with_details"
)

acetaminophen_codes_with_details

acetaminophen_codes_with_details[[1]] |> 
  glimpse()

Instead of getting back all concepts for acetaminophen, we could require that only concepts associated with acetaminophen and at least one more drug ingredient (i.e. combination therapies) are returned.

acetaminophen_two_or_more_ingredients <- getDrugIngredientCodes(
  cdm = cdm,
  name = "acetaminophen",
  ingredientRange = c(2,Inf),
  type = "codelist_with_details"
)

acetaminophen_two_or_more_ingredients

acetaminophen_two_or_more_ingredients[[1]] |> 
  glimpse()

Or we could instead only return concepts associated with acetaminophen and no other drug ingredient.

acetaminophen_one_ingredient <- getDrugIngredientCodes(
  cdm = cdm,
  name = "acetaminophen",
  ingredientRange = c(1,1),
  type = "codelist_with_details"
)

acetaminophen_one_ingredient

acetaminophen_one_ingredient[[1]] |> 
  glimpse()

Lastly, we could also restrict to a particular dose form. Let's try to see if there are any injection dose form of acetaminophen.

acetaminophen_injections <- getDrugIngredientCodes(
  cdm = cdm,
  name = "acetaminophen",
  doseForm = "injection",
  type = "codelist_with_details"
)

acetaminophen_injections

In this case we see that in Eunomia there no concept for acetaminophen with an injection dose form.

The previous examples have focused on single drug ingredient. We can though specify multiple ingredients, in which case we will get a codelist back for each.

acetaminophen_heparin_codes <- getDrugIngredientCodes(
  cdm = cdm,
  name = c("acetaminophen", "heparin")
  )

acetaminophen_heparin_codes

And if we don´t specify an ingredient, we´ll get a codelist for every drug ingredient in the vocabularies.

ingredient_codes <- getDrugIngredientCodes(cdm = cdm)
ingredient_codes

Medication codelists based on ATC classifications

Analogous to getDrugIngredientCodes(), getATCCodes() can be used to generate a codelist based on a particular ATC class. To show this, we´ll use a the mock vocabulary from CodelistGenerator.

cdm_mock <- mockVocabRef()

In this example, we will produce an ATC level 1 codelist based on Alimentary Tract and Metabolism Drugs.

atc_codelist <- getATCCodes(
  cdm = cdm_mock,
  level = "ATC 1st",
  name = "alimentary tract and metabolism"
)

atc_codelist

Condition Codelists using ICD10 chapters and subchapters

We can use getICD10StandardCodes() to generate condition codes based on ICD10 chapters and subchapters. As ICD10 is a non-standard vocabulary in the OMOP CDM this function returns standard concepts associated with these ICD10 chapters and subchapters directly via a mapping from them or indirectly from being a descendant concept of a code that is mapped from them. It is important to note that getICD10StandardCodes() will only return results if the ICD codes are included in the vocabulary tables.

For this example, we will try to generate a codelist for arthropathies.

arthropathy_codes <- getICD10StandardCodes(
  cdm = cdm_mock,
  name = "arthropathies"
)
arthropathy_codes
arthropathy_codes$arthropathies

As with the above functions, we could return concepts with their details rather than as a codelist.

arthropathy_codes <- getICD10StandardCodes(
  cdm = cdm_mock,
  name = "arthropathies", 
  type = "codelist_with_details"
)
arthropathy_codes

arthropathy_codes[[1]]