Medical Terminologies MCP

Map ICD-10 to ICD-11

map_icd10_to_icd11

Read-onlyIdempotent

Maps ICD-10 codes to authoritative WHO ICD-11 categories, returning primary and alternative mappings with codes, titles, and URIs for clinical coding and billing migration.

Instructions

Authoritative ICD-10 → ICD-11 mapping using WHO transition tables (release 2025-01, bundled with the server).

Returns the primary 1:1 ICD-11 category for the ICD-10 code plus any alternative ICD-11 candidates that WHO documents (some ICD-10 concepts split into multiple ICD-11 entities). For each mapping, includes the ICD-11 code, title, chapter, and the Foundation URI / Linearization URI for navigating to the full entity definition.

Use this for clinical coding, billing migration, retrospective analysis, and any workflow that needs authoritative mapping rather than text-search candidates. Coverage: 11,243 ICD-10 categories (excludes chapters and blocks like "A00-A09" which aren't used in clinical coding).

Provide a code like "E11" (Type 2 diabetes), "I21" (Acute MI), or "A07.8" (4 alternatives in WHO's table). Both dotted ("A07.8") and undotted ("A078") forms are accepted.

Returns "no mapping" when the code isn't in the WHO category-level table — that's the honest answer rather than a fuzzy search fallback.

Input Schema

Name	Required	Description	Default
`icd10_code`	Yes	ICD-10 code to query in the ICD-11 search index (e.g., E11, I21.0, J18.9)

Output Schema

Name	Required	Description
`found`	Yes	Whether the code is in the WHO ICD-10 → ICD-11 transition table.
`icd10`	Yes	Source ICD-10 entry from the WHO table. Null when found=false.
`query`	Yes	The ICD-10 code as submitted (raw, before normalization).
`source`	Yes	The bundled WHO ICD-10 → ICD-11 transition table release this answer comes from.
`primary`	Yes	Primary 1:1 ICD-11 mapping. Null when found=false.
`provenance`	Yes	Provenance block: source, URL, data vintage, extraction instant, origin diagnostics, citation, license
`attribution`	Yes	Canonical source URLs of this response (attribution list)
`alternatives`	Yes	Additional ICD-11 candidates WHO documents for this ICD-10 code. Empty when the primary is the only documented mapping (or when found=false). 1,461 of the 11,243 indexed codes have non-empty alternatives.

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedv2.4.0Oct 29, 2026

addedOutput schema / properties / source / description

Added value: +"The bundled WHO ICD-10 → ICD-11 transition table release this answer comes from."

Changed7 schema fields changedv2.3.0Oct 16, 2026

changedOutput schema / properties / provenance / description

Previous value: -"Provenance block (contract v1.1): source, URL, data vintage, extraction instant, origin diagnostics, citation, license"New value: +"Provenance block: source, URL, data vintage, extraction instant, origin diagnostics, citation, license"

addedOutput schema / properties / provenance / properties / derivation_note

Added value: +{
+  "description": "What this server computed; present together with derived",
+  "type": "string"
+}

addedOutput schema / properties / provenance / properties / derived

Added value: +{
+  "description": "Present (true) only when this server computed the value (e.g. a ranking or summary statistics) instead of passing on what the source returned",
+  "type": "boolean"
+}

changedOutput schema / properties / provenance / properties / field_sources / description

Previous value: -"Present only when the response joins parts from different origins or extraction instants (contract v1.2): for each group of fields, its URL, extraction instant and whether it came from cache. Absent in single-origin responses"New value: +"Present only when the response joins parts from different origins or extraction instants: for each group of fields, its URL, extraction instant and whether it came from cache. Absent in single-origin responses"

addedOutput schema / properties / provenance / properties / notices

Added value: +{
+  "description": "Caveats the source publishes about the data, verbatim (license statements are not repeated here; see the info://licenses resource). Absent when there is none",
+  "items": {
+    "type": "string"
+  },
+  "minItems": 1,
+  "type": "array"
+}

changedOutput schema / properties / provenance / properties / retrieval / description

Previous value: -"Origin diagnostics of THIS source in this call (contract v1.1): requests made to the upstream, attempts summed across retries, anomalies worked around (kind + count); unstable=true when any anomaly happened. null when nothing was measured (bundled dataset, or response served entirely from cache)"New value: +"Origin diagnostics of THIS source in this call: requests made to the upstream, attempts summed across retries, anomalies worked around (kind + count); unstable=true when any anomaly happened. null when nothing was measured (bundled dataset, or response served entirely from cache)"

addedOutput schema / properties / provenance / properties / revision

Added value: +{
+  "additionalProperties": false,
+  "description": "Whether the data can still change at the source: current = the version in force, the source may revise it; provisional = preliminary; final = will not change. Absent when unknown",
+  "properties": {
+    "note": {
+      "description": "O específico da fonte: o que revisa, quando, por quê",
+      "type": [
+        "string",
+        "null"
+      ]
+    },
+    "status": {
+      "description": "current = versão vigente, a fonte pode revisá-la; provisional = preliminar, incompleta ou sujeita a mudança (não compare como se fosse fechada); final = não muda mais, declarado pela fonte",
+      "enum": [
+        "current",
+        "provisional",
+        "final"
+      ],
+      "type": "string"
+    }
+  },
+  "required": [
+    "status",
+    "note"
+  ],
+  "type": "object"
+}

Changed1 schema field changedv2.1.1Oct 7, 2026

addedOutput schema / properties / provenance / properties / field_sources

Added value: +{
+  "description": "Present only when the response joins parts from different origins or extraction instants (contract v1.2): for each group of fields, its URL, extraction instant and whether it came from cache. Absent in single-origin responses",
+  "items": {
+    "additionalProperties": false,
+    "description": "Proveniência de um grupo de campos da resposta: de onde veio e quando foi extraído",
+    "properties": {
+      "data_vintage": {
+        "description": "Vintage/competência da sub-fonte",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "dataset_id": {
+        "description": "Identificador do conjunto da sub-fonte",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "fields": {
+        "description": "Campos do payload atribuídos a esta sub-fonte",
+        "items": {
+          "type": "string"
+        },
+        "minItems": 1,
+        "type": "array"
+      },
+      "retrieved_at": {
+        "description": "ISO-8601 da extração desta sub-fonte na origem",
+        "type": [
+          "string",
+          "null"
+        ]
+      },
+      "served_from_cache": {
+        "description": "true se esta sub-fonte veio do cache do servidor (retrieved_at é o da extração original); false se foi buscada nesta chamada; null se o servidor não distingue",
+        "type": [
+          "boolean",
+          "null"
+        ]
+      },
+      "source_url": {
+        "description": "URL canônica da sub-fonte que originou estes campos",
+        "type": "string"
+      }
+    },
+    "required": [
+      "fields",
+      "source_url",
+      "dataset_id",
+      "data_vintage",
+      "retrieved_at"
+    ],
+    "type": "object"
+  },
+  "minItems": 1,
+  "type": "array"
+}

Changed3 schema fields changedv1.15.0Sep 27, 2026

changedOutput schema / properties / provenance / description

Previous value: -"Provenance block (contract v1.0): source, URL, data vintage, extraction instant, citation, license"New value: +"Provenance block (contract v1.1): source, URL, data vintage, extraction instant, origin diagnostics, citation, license"

addedOutput schema / properties / provenance / properties / retrieval

Added value: +{
+  "anyOf": [
+    {
+      "additionalProperties": false,
+      "properties": {
+        "anomalies": {
+          "description": "Anomalias superadas até o sucesso, somadas por classe, em ordem fixa; [] se nenhuma",
+          "items": {
+            "additionalProperties": false,
+            "properties": {
+              "count": {
+                "description": "Ocorrências desta classe na chamada",
+                "maximum": 9007199254740991,
+                "minimum": 1,
+                "type": "integer"
+              },
+              "kind": {
+                "description": "Classe da anomalia (vocabulário fechado do contrato)",
+                "enum": [
+                  "timeout",
+                  "network",
+                  "http_4xx",
+                  "http_5xx",
+                  "rate_limited",
+                  "malformed_body"
+                ],
+                "type": "string"
+              }
+            },
+            "required": [
+              "kind",
+              "count"
+            ],
+            "type": "object"
+          },
+          "type": "array"
+        },
+        "attempts": {
+          "description": "Tentativas somadas, incluindo as repetidas (>= requests)",
+          "maximum": 9007199254740991,
+          "minimum": 1,
+          "type": "integer"
+        },
+        "requests": {
+          "description": "Idas distintas à origem que compõem esta resposta (fatias, páginas)",
+          "maximum": 9007199254740991,
+          "minimum": 1,
+          "type": "integer"
+        },
+        "unstable": {
+          "description": "true se houve repetição (attempts > requests) ou alguma anomalia",
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "requests",
+        "attempts",
+        "anomalies",
+        "unstable"
+      ],
+      "type": "object"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "description": "Origin diagnostics of THIS source in this call (contract v1.1): requests made to the upstream, attempts summed across retries, anomalies worked around (kind + count); unstable=true when any anomaly happened. null when nothing was measured (bundled dataset, or response served entirely from cache)"
+}

changedOutput schema / properties / provenance / required

Previous value: -[
-  "source",
-  "source_url",
-  "data_vintage",
-  "retrieved_at",
-  "citation",
-  "license"
-]New value: +[
+  "source",
+  "source_url",
+  "data_vintage",
+  "retrieved_at",
+  "retrieval",
+  "citation",
+  "license"
+]

Changed1 schema field changedv1.11.0Sep 15, 2026
- addedInput schema / additionalProperties
```
Added value: +false
```
Changed4 schema fields changedv1.9.1Sep 1, 2026
- removedOutput schema / properties / provenance / properties / data_vintage / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / provenance / properties / data_vintage / type
```
Added value: +[
+  "string",
+  "null"
+]
```
- removedOutput schema / properties / provenance / properties / license / anyOf
```
Removed value: -[
-  {
-    "type": "string"
-  },
-  {
-    "type": "null"
-  }
-]
```
- addedOutput schema / properties / provenance / properties / license / type
```
Added value: +[
+  "string",
+  "null"
+]
```

Changed3 schema fields changedv1.8.0Aug 10, 2026

addedOutput schema / properties / attribution

Added value: +{
+  "description": "Canonical source URLs of this response (attribution list)",
+  "items": {
+    "type": "string"
+  },
+  "type": "array"
+}

addedOutput schema / properties / provenance

Added value: +{
+  "additionalProperties": false,
+  "description": "Provenance block (contract v1.0): source, URL, data vintage, extraction instant, citation, license",
+  "properties": {
+    "citation": {
+      "description": "Ready-to-use citation/attribution string",
+      "type": "string"
+    },
+    "data_vintage": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Version/release of the data as exposed by the source; null when not exposed"
+    },
+    "license": {
+      "anyOf": [
+        {
+          "type": "string"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "License / legal regime of the data"
+    },
+    "retrieved_at": {
+      "description": "Real instant of the upstream extraction (ISO-8601, UTC). Responses served from cache keep the ORIGINAL fetch instant.",
+      "type": "string"
+    },
+    "source": {
+      "description": "Official upstream source of this data",
+      "type": "string"
+    },
+    "source_url": {
+      "description": "Canonical URL of the source (API base or dataset release)",
+      "type": "string"
+    }
+  },
+  "required": [
+    "source",
+    "source_url",
+    "data_vintage",
+    "retrieved_at",
+    "citation",
+    "license"
+  ],
+  "type": "object"
+}

changedOutput schema / required

Previous value: -[
-  "query",
-  "found",
-  "icd10",
-  "primary",
-  "alternatives",
-  "source"
-]New value: +[
+  "query",
+  "found",
+  "icd10",
+  "primary",
+  "alternatives",
+  "source",
+  "provenance",
+  "attribution"
+]

Changed5 schema fields changedv1.5.7Jun 21, 2026

removedInput schema / additionalProperties
```
Removed value: -false
```
addedOutput schema / properties / alternatives / items / properties / depth / maximum
```
Added value: +9007199254740991
```
addedOutput schema / properties / alternatives / items / properties / depth / minimum
```
Added value: +-9007199254740991
```

changedOutput schema / properties / icd10 / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "chapter": {
-        "type": "string"
-      },
-      "code": {
-        "type": "string"
-      },
-      "depth": {
-        "type": "integer"
-      },
-      "title": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "code",
-      "title",
-      "chapter",
-      "depth"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "chapter": {
+        "type": "string"
+      },
+      "code": {
+        "type": "string"
+      },
+      "depth": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "title": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "code",
+      "title",
+      "chapter",
+      "depth"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

changedOutput schema / properties / primary / anyOf

Previous value: -[
-  {
-    "additionalProperties": false,
-    "properties": {
-      "chapter": {
-        "type": "string"
-      },
-      "classKind": {
-        "type": "string"
-      },
-      "code": {
-        "type": "string"
-      },
-      "depth": {
-        "type": "integer"
-      },
-      "foundationUri": {
-        "type": "string"
-      },
-      "linearizationUri": {
-        "type": "string"
-      },
-      "title": {
-        "type": "string"
-      }
-    },
-    "required": [
-      "code",
-      "title",
-      "chapter",
-      "foundationUri",
-      "linearizationUri",
-      "classKind",
-      "depth"
-    ],
-    "type": "object"
-  },
-  {
-    "type": "null"
-  }
-]New value: +[
+  {
+    "additionalProperties": false,
+    "properties": {
+      "chapter": {
+        "type": "string"
+      },
+      "classKind": {
+        "type": "string"
+      },
+      "code": {
+        "type": "string"
+      },
+      "depth": {
+        "maximum": 9007199254740991,
+        "minimum": -9007199254740991,
+        "type": "integer"
+      },
+      "foundationUri": {
+        "type": "string"
+      },
+      "linearizationUri": {
+        "type": "string"
+      },
+      "title": {
+        "type": "string"
+      }
+    },
+    "required": [
+      "code",
+      "title",
+      "chapter",
+      "foundationUri",
+      "linearizationUri",
+      "classKind",
+      "depth"
+    ],
+    "type": "object"
+  },
+  {
+    "type": "null"
+  }
+]

Changed1 schema field changedv1.5.0May 13, 2026

changedOutput schema / (root)

Previous value: -nullNew value: +{
+  "additionalProperties": false,
+  "properties": {
+    "alternatives": {
+      "description": "Additional ICD-11 candidates WHO documents for this ICD-10 code. Empty when the primary is the only documented mapping (or when found=false). 1,461 of the 11,243 indexed codes have non-empty alternatives.",
+      "items": {
+        "additionalProperties": false,
+        "properties": {
+          "chapter": {
+            "type": "string"
+          },
+          "classKind": {
+            "type": "string"
+          },
+          "code": {
+            "type": "string"
+          },
+          "depth": {
+            "type": "integer"
+          },
+          "foundationUri": {
+            "type": "string"
+          },
+          "linearizationUri": {
+            "type": "string"
+          },
+          "title": {
+            "type": "string"
+          }
+        },
+        "required": [
+          "code",
+          "title",
+          "chapter",
+          "foundationUri",
+          "linearizationUri",
+          "classKind",
+          "depth"
+        ],
+        "type": "object"
+      },
+      "type": "array"
+    },
+    "found": {
+      "description": "Whether the code is in the WHO ICD-10 → ICD-11 transition table.",
+      "type": "boolean"
+    },
+    "icd10": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "chapter": {
+              "type": "string"
+            },
+            "code": {
+              "type": "string"
+            },
+            "depth": {
+              "type": "integer"
+            },
+            "title": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "code",
+            "title",
+            "chapter",
+            "depth"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Source ICD-10 entry from the WHO table. Null when found=false."
+    },
+    "primary": {
+      "anyOf": [
+        {
+          "additionalProperties": false,
+          "properties": {
+            "chapter": {
+              "type": "string"
+            },
+            "classKind": {
+              "type": "string"
+            },
+            "code": {
+              "type": "string"
+            },
+            "depth": {
+              "type": "integer"
+            },
+            "foundationUri": {
+              "type": "string"
+            },
+            "linearizationUri": {
+              "type": "string"
+            },
+            "title": {
+              "type": "string"
+            }
+          },
+          "required": [
+            "code",
+            "title",
+            "chapter",
+            "foundationUri",
+            "linearizationUri",
+            "classKind",
+            "depth"
+          ],
+          "type": "object"
+        },
+        {
+          "type": "null"
+        }
+      ],
+      "description": "Primary 1:1 ICD-11 mapping. Null when found=false."
+    },
+    "query": {
+      "description": "The ICD-10 code as submitted (raw, before normalization).",
+      "type": "string"
+    },
+    "source": {
+      "additionalProperties": false,
+      "properties": {
+        "publisher": {
+          "description": "Authoritative publisher (e.g. \"WHO\").",
+          "type": "string"
+        },
+        "release_date": {
+          "description": "ISO date string for the release.",
+          "type": "string"
+        },
+        "version": {
+          "description": "Transition table release identifier (e.g. \"2025-01\").",
+          "type": "string"
+        }
+      },
+      "required": [
+        "publisher",
+        "version",
+        "release_date"
+      ],
+      "type": "object"
+    }
+  },
+  "required": [
+    "query",
+    "found",
+    "icd10",
+    "primary",
+    "alternatives",
+    "source"
+  ],
+  "type": "object"
+}

First observedv1.2.1May 11, 2026

TDQS

A4.9/5.0

Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already cover safety (readOnly, idempotent, non-destructive), so the bar is lower, yet the description still adds substantial context: data provenance and release version, 11,243-category coverage envelope, split-mapping behavior, and the explicit "no mapping" outcome instead of a fuzzy fallback. That last point is particularly valuable for an agent deciding how to interpret an empty result.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with the core mapping statement and organized into provenance, return contents, usage, and input format. Slightly long for a single-parameter tool, and the return-value paragraph overlaps with the output schema, but no sentence is filler.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Given an output schema exists, the description needn't explain returns, yet it adds the one thing the schema can't convey: what a negative result means ("honest answer rather than a fuzzy search fallback") and what the mapping's domain boundaries are. Nothing an agent needs to call and interpret this tool is missing.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters5/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so baseline is 3, but the description adds real meaning the schema lacks: both dotted ("A07.8") and undotted ("A078") forms are accepted, and it gives worked examples including one with known multiple alternatives. This directly changes how an agent formats input.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

States a specific verb and resource (ICD-10 → ICD-11 mapping) and names the authoritative source (WHO transition tables). It explicitly contrasts itself with text-search siblings ("rather than text-search candidates"), so an agent can distinguish it from icd11_search or find_equivalent without opening schemas.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Names concrete use cases (clinical coding, billing migration, retrospective analysis) and explicitly routes agents away from fuzzy/text-search alternatives. The coverage note (excludes chapter/block codes like "A00-A09") is an implicit when-not-to-use rule that prevents a common mis-call.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.