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Introduction

Bahmni Line Reports offer flexible configuration options to seamlessly integrate with a series of extensions, enhancing functionalities like custom report generation. Among these extensions is the ICD-10 extension, a module designed for mapping SNOMED codes to ICD-10 codes within Bahmni Reports. This extension supports ICD-10 mapping in both Snowstorm and Snowstorm Lite environments. Snowstorm Lite is a compact FHIR terminology server tailored for low-resource settings.

SNOMED to ICD-10 Line Report Screenshot

Given below is an example of a SNOMED Diagnosis Line Report with SNOMED to ICD-10 mapping

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Configuring Extensions

The provided configuration example illustrates how to set up a SNOMED Diagnosis Line Report to utilise the ICD-10 extension

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  reports:
    image: bahmni/reports:${REPORTS_IMAGE_TAG:?}
    ...
    volumes:
      - "${REPORTS_EXTENSIONS_CONFIG_PATH:?}:/var/run/bahmni-reports/bahmni-reports/WEB-INF/lib/icd10-extensions-1.0.0-SNAPSHOT.jar:ro"

ICD-10 Extension Repository

Source Code Repository for ICD-10 reports extension is as follows:

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Typically all the report extensions should implement the enrich method from the interface org.bahmni.reports.extensions.ResultSetExtension

Mapping ICD-10 in a Snowstorm Environment

ICD-10 Reports extension for Snowstorm borrows the same mechanism of the ICD-10 mappings Demonstrator found here: https://ihtsdo.github.io/iid-icd-maps/

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The screenshot shows that the SNOMED CT code 421671002 matches the ICD-10 codes B20.8 and J17.8 (see green check mark) for a given age and gender.

Native API

SNOMED codes are mapped to ICD-10 codes by filtering a reference rule set based on the SNOMED code, patient age, and gender

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MapTarget – the target ICD-10 code which will be mapped to SNOMED Code

Algorithm to extract ICD-10 code(s)

The algorithm for mapping SNOMED codes to ICD-10 codes using Snowstorm is as follows:

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3. Order the mapping rules by mapGroup and then by mapPriority.

4. For each mapGroup, iterate over the rules in ascending order of priority and evaluate them until a matching mapTarget is found.

5. To evaluate each rule, the system uses the javax.script.ScriptEngine evaluator to convert the rule into a JavaScript expression and then evaluates the expression. The evaluator can optionally take into account the patient's age and gender.

6. If the JavaScript expression evaluates to true, then the corresponding mapTarget has the matching ICD-10 code for the given mapGroup. The system collects these codes into an ArrayList of matching ICD-10 codes.

7. The ICD-10 codes that are generated by the mapping process will be displayed in the enriched column of the report.

Mapping ICD-10 in a Snowstorm Lite Environment

FHIR API

This API uses the following URL template configuration from the application.properties file:

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{
  "resourceType": "Parameters",
  "parameter": [
    {
      "name": "result",
      "valueBoolean": false
    },
    {
      "name": "message",
      "valueString": "Please observe the following map advice. Group:1, Priority:1, Rule:TRUE, Advice:'ALWAYS B20.8', Map Category:'447637006'."
    },
    {
      "name": "match",
      "part": [
        {
          "name": "equivalence",
          "valueCode": "unmatched"
        },
        {
          "name": "concept",
          "valueCoding": {
            "system": "http://hl7.org/fhir/sid/icd-10",
            "code": "B20.8"
          }
        },
        {
          "name": "source",
          "valueString": "http://snomed.info/sct/900000000000207008/version/20230731?fhir_cm=447562003"
        }
      ]
    },
    {
      "name": "message",
      "valueString": "Please observe the following map advice. Group:2, Priority:1, Rule:TRUE, Advice:'ALWAYS J17.8 | THIS CODE MAY BE USED IN THE PRIMARY POSITION WHEN THE MANIFESTATION IS THE PRIMARY FOCUS OF CARE', Map Category:'447637006'."
    },
    {
      "name": "match",
      "part": [
        {
          "name": "equivalence",
          "valueCode": "unmatched"
        },
        {
          "name": "concept",
          "valueCoding": {
            "system": "http://hl7.org/fhir/sid/icd-10",
            "code": "J17.8"
          }
        },
        {
          "name": "source",
          "valueString": "http://snomed.info/sct/900000000000207008/version/20230731?fhir_cm=447562003"
        }
      ]
    }
  ]
}

Algorithm to extract ICD-10 code(s)

The algorithm for mapping SNOMED codes to ICD-10 codes is as follows:

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