{
  "resourceType": "StructureDefinition",
  "url": "https://example.org/fhir/StructureDefinition/MyChargeItem",
  "name": "MyChargeItem",
  "status": "draft",
  "fhirVersion": "4.0.1",
  "kind": "resource",
  "abstract": false,
  "type": "ChargeItem",
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/ChargeItem",
  "derivation": "constraint",
  "differential": {
    "element": [
      {
        "id": "ChargeItem.code.coding",
        "path": "ChargeItem.code.coding",
        "slicing": {
          "discriminator": [
            {
              "type": "pattern",
              "path": "$this"
            }
          ],
          "rules": "closed"
        },
        "min": 2,
        "max": "3",
        "mustSupport": true
      }
    ]
  }
}