diff --git a/tools/spectral/ipa/__tests__/IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf.test.js b/tools/spectral/ipa/__tests__/IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf.test.js
new file mode 100644
index 0000000000..b4859bd16d
--- /dev/null
+++ b/tools/spectral/ipa/__tests__/IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf.test.js
@@ -0,0 +1,128 @@
+import testRule from './__helpers__/testRule.js';
+import { DiagnosticSeverity } from '@stoplight/types';
+
+testRule('xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf', [
+  {
+    name: 'valid schemas',
+    document: {
+      components: {
+        schemas: {
+          SchemaOneOf: {
+            discriminator: {
+              propertyName: 'type',
+            },
+            oneOf: [{}],
+          },
+          SchemaAnyOf: {
+            discriminator: {
+              propertyName: 'type',
+            },
+            anyOf: [{}],
+          },
+          SchemaAllOf: {
+            discriminator: {
+              propertyName: 'type',
+            },
+            allOf: [{}],
+          },
+        },
+      },
+    },
+    errors: [],
+  },
+  {
+    name: 'invalid schemas',
+    document: {
+      components: {
+        schemas: {
+          Schema: {
+            discriminator: {
+              propertyName: 'type',
+            },
+            properties: {
+              type: {
+                type: 'string',
+              },
+            },
+          },
+          NestedSchema: {
+            properties: {
+              name: {
+                type: 'object',
+                discriminator: {
+                  propertyName: 'first',
+                },
+                properties: {
+                  first: {
+                    type: 'string',
+                  },
+                },
+              },
+              address: {
+                type: 'string',
+              },
+            },
+          },
+        },
+      },
+    },
+    errors: [
+      {
+        code: 'xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf',
+        message: "Each discriminator property must be accompanied by a 'oneOf', 'anyOf' or 'allOf' property.",
+        path: ['components', 'schemas', 'Schema'],
+        severity: DiagnosticSeverity.Warning,
+      },
+      {
+        code: 'xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf',
+        message: "Each discriminator property must be accompanied by a 'oneOf', 'anyOf' or 'allOf' property.",
+        path: ['components', 'schemas', 'NestedSchema', 'properties', 'name'],
+        severity: DiagnosticSeverity.Warning,
+      },
+    ],
+  },
+  {
+    name: 'invalid schemas with exceptions',
+    document: {
+      components: {
+        schemas: {
+          Schema: {
+            discriminator: {
+              propertyName: 'type',
+            },
+            properties: {
+              type: {
+                type: 'string',
+              },
+            },
+            'x-xgen-IPA-exception': {
+              'xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf': 'reason',
+            },
+          },
+          NestedSchema: {
+            properties: {
+              name: {
+                type: 'object',
+                discriminator: {
+                  propertyName: 'first',
+                },
+                properties: {
+                  first: {
+                    type: 'string',
+                  },
+                },
+                'x-xgen-IPA-exception': {
+                  'xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf': 'reason',
+                },
+              },
+              address: {
+                type: 'string',
+              },
+            },
+          },
+        },
+      },
+    },
+    errors: [],
+  },
+]);
diff --git a/tools/spectral/ipa/rulesets/IPA-125.yaml b/tools/spectral/ipa/rulesets/IPA-125.yaml
index 4bcd53a84c..a4d82eb851 100644
--- a/tools/spectral/ipa/rulesets/IPA-125.yaml
+++ b/tools/spectral/ipa/rulesets/IPA-125.yaml
@@ -5,6 +5,7 @@ functions:
   - IPA125OneOfMustHaveDiscriminator
   - IPA125OneOfNoBaseTypes
   - IPA125OneOfSchemaPropertySameType
+  - IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf
 
 rules:
   xgen-IPA-125-oneOf-must-have-discriminator:
@@ -79,3 +80,15 @@ rules:
     given: '$.components.schemas..oneOf'
     then:
       function: 'IPA125OneOfSchemaPropertySameType'
+
+  xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf:
+    description: |
+      Each discriminator property must be accompanied by a `oneOf`, `anyOf` or `allOf` property 
+
+      ##### Implementation details
+      - Rule checks that a `discriminator` property has a `oneOf`, `anyOf` or `allOf` sibling
+    message: '{{error}} https://mdb.link/mongodb-atlas-openapi-validation#xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf'
+    severity: warn
+    given: '$..discriminator'
+    then:
+      function: 'IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf'
diff --git a/tools/spectral/ipa/rulesets/README.md b/tools/spectral/ipa/rulesets/README.md
index 0f58a44dd1..67f8dc296c 100644
--- a/tools/spectral/ipa/rulesets/README.md
+++ b/tools/spectral/ipa/rulesets/README.md
@@ -999,6 +999,14 @@ Rule checks for the following conditions:
   - Applies only to object type schemas with `oneOf`
   - Ensures that if a property is defined in multiple `oneOf` schemas, it must have the same type in each schema (base type or object schema)
 
+#### xgen-IPA-125-discriminator-must-accompany-oneOf-anyOf-allOf
+
+ ![warn](https://img.shields.io/badge/warning-yellow) 
+Each discriminator property must be accompanied by a `oneOf`, `anyOf` or `allOf` property 
+
+##### Implementation details
+- Rule checks that a `discriminator` property has a `oneOf`, `anyOf` or `allOf` sibling
+
 
 
 ### IPA-126
diff --git a/tools/spectral/ipa/rulesets/functions/IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf.js b/tools/spectral/ipa/rulesets/functions/IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf.js
new file mode 100644
index 0000000000..7d456a7b63
--- /dev/null
+++ b/tools/spectral/ipa/rulesets/functions/IPA125DiscriminatorMustAccompanyOneOfAnyOfAllOf.js
@@ -0,0 +1,24 @@
+import { evaluateAndCollectAdoptionStatus } from './utils/collectionUtils.js';
+import { resolveObject } from './utils/componentUtils.js';
+
+const ERROR_MESSAGE = "Each discriminator property must be accompanied by a 'oneOf', 'anyOf' or 'allOf' property.";
+
+export default (input, _, { path, documentInventory, rule }) => {
+  const siblingPath = path.slice(0, path.length - 1);
+  const siblings = resolveObject(documentInventory.resolved, siblingPath);
+
+  const errors = checkViolationsAndReturnErrors(input, siblingPath, Object.keys(siblings));
+  return evaluateAndCollectAdoptionStatus(errors, rule.name, siblings, siblingPath);
+};
+
+function checkViolationsAndReturnErrors(input, path, siblingKeys) {
+  if (!siblingKeys.includes('oneOf') && !siblingKeys.includes('anyOf') && !siblingKeys.includes('allOf')) {
+    return [
+      {
+        path,
+        message: ERROR_MESSAGE,
+      },
+    ];
+  }
+  return [];
+}