| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Closed fracture of zygomatic tripod | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial hemorrhage co-occurrent and due to closed skull fracture | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to closed skull fracture | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of palate | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of zygomatic arch | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of hyoid bone | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of orbit | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed skull fracture with subarachnoid, subdural AND/OR extradural hemorrhage | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of alveolus | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed skull fracture without intracranial injury | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of nasal bones | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of maxilla | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Cerebral laceration AND/OR contusion co-occurrent and due to closed skull fracture | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of mandible | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, unspecified state of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with no loss of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with less than 1 hour loss of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with 1-24 hours loss of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with more than 24 hours loss of consciousness with return to pre-existing conscious level | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with loss of consciousness of unspecified duration | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with concussion, unspecified | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS with intracranial injury | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of base of skull without intracranial injury | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of malar AND/OR maxillary bones | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial hemorrhage co-occurrent and due to closed fracture of vault of skull | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture vault of skull without intracranial injury | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to closed fracture of vault of skull | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of alveolar ridge of maxilla | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed horizontal fracture of maxilla | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed pyramidal fracture of maxilla | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Complete closed fracture of maxilla | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of zygomatic arch | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of zygoma | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of base of skull without mention of intracranial injury, unspecified state of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed skull fracture with subarachnoid, subdural AND/OR extradural hemorrhage | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of upper jaw, closed | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial hemorrhage co-occurrent and due to closed fracture of vault of skull | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial hemorrhage co-occurrent and due to closed fracture of base of skull | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to closed fracture of base of skull | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to closed fracture of vault of skull | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of base of skull | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of vault of skull | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of frontal sinus | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of naso orbital ethmoid | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of occipital bone | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of temporal bone | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed depressed fracture of skull | Is a | True | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to closed skull fracture | Due to | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier | 3 | 
| Intracranial hemorrhage co-occurrent and due to closed skull fracture | Due to | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier | 3 | 
| Cerebral laceration AND/OR contusion co-occurrent and due to closed skull fracture | Due to | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier | 2 | 
| Closed fracture of skull with cerebral laceration | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull with cerebral contusion | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS with intracranial injury | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with 1-24 hours loss of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with more than 24 hours loss of consciousness with return to pre-existing conscious level | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with less than 1 hour loss of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with more than 24 hours loss of consciousness without return to pre-existing conscious level | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with loss of consciousness of unspecified duration | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with concussion, unspecified | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, unspecified state of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with no loss of consciousness | Is a | False | Closed fracture of skull | Inferred relationship | Existential restriction modifier |  |