MedDRA Term

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/meddra/refs/heads/main/json-schema/meddra-term-schema.json",
  "title": "MedDRA Term",
  "description": "A term in the Medical Dictionary for Regulatory Activities (MedDRA) hierarchy",
  "type": "object",
  "required": ["code", "termText", "level", "current"],
  "properties": {
    "code": {
      "type": "integer",
      "description": "MedDRA numeric term code (8 digits)",
      "minimum": 10000000,
      "maximum": 99999999
    },
    "termText": {
      "type": "string",
      "description": "Official MedDRA term name",
      "maxLength": 100
    },
    "level": {
      "type": "string",
      "enum": ["SOC", "HLGT", "HLT", "PT", "LLT"],
      "description": "Hierarchy level: SOC=System Organ Class, HLGT=High Level Group Term, HLT=High Level Term, PT=Preferred Term, LLT=Lowest Level Term"
    },
    "current": {
      "type": "boolean",
      "description": "Whether this term is current and not deprecated/retired"
    },
    "primarySOCCode": {
      "type": "integer",
      "description": "Code of the primary System Organ Class for this term"
    },
    "primarySOCName": {
      "type": "string",
      "description": "Name of the primary System Organ Class"
    },
    "version": {
      "type": "string",
      "description": "MedDRA dictionary version (e.g., 27.0)",
      "pattern": "^[0-9]+\\.[0-9]+$"
    },
    "language": {
      "type": "string",
      "description": "ISO 639-1 language code",
      "default": "en"
    },
    "allSOCLinks": {
      "type": "array",
      "description": "All SOC associations (a PT can belong to multiple SOCs)",
      "items": {
        "type": "object",
        "required": ["socCode", "socName", "isPrimary"],
        "properties": {
          "socCode": {
            "type": "integer"
          },
          "socName": {
            "type": "string"
          },
          "isPrimary": {
            "type": "boolean",
            "description": "True if this is the primary SOC pathway"
          }
        }
      }
    }
  },
  "$defs": {
    "HierarchyLevels": {
      "description": "MedDRA 5-level hierarchy",
      "type": "string",
      "enum": ["SOC", "HLGT", "HLT", "PT", "LLT"],
      "x-description": {
        "SOC": "System Organ Class — highest level, 27 classes (e.g., Hepatobiliary disorders)",
        "HLGT": "High Level Group Term — groups multiple HLTs",
        "HLT": "High Level Term — groups related PTs",
        "PT": "Preferred Term — distinct medical concept for use in submissions",
        "LLT": "Lowest Level Term — verbatim terms mapped to a PT"
      }
    }
  }
}