| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Fracture of ethmoid sinus | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial hemorrhage co-occurrent and due to closed skull fracture | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to closed skull fracture | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Open skull fracture with intracranial hemorrhage | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Intracranial injury co-occurrent and due to open skull fracture | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of ethmoid bone | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of lacrimal bone | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Multiple open fractures of skull AND/OR face without intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of base of skull | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of face bones | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of posterior fossa | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of middle fossa | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Open skull fracture without intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of vault of skull | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Multiple fractures of skull | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed skull fracture with subarachnoid, subdural AND/OR extradural hemorrhage | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Open skull fracture with subarachnoid, subdural AND/OR extradural hemorrhage | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of frontal sinus | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed skull fracture without intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of skull as birth trauma | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of anterior fossa | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Cerebral laceration AND/OR contusion co-occurrent and due to closed skull fracture | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Cerebral laceration AND/OR contusion co-occurrent and due to open skull fracture | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Other and unqualified skull fractures | Is a | False | 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 | 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 | 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 | 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 | 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 | 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 | 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 | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS without mention of intracranial injury, with concussion, unspecified | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull NOS with intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Open fracture of skull NOS without mention of intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Open fracture of skull NOS with intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of skull NOS | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Skull fracture NOS | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Open fracture of skull | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of skull | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of frontonasoethmoidal complex | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of maxilla | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of zygomatic complex | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of palatal process | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fractured nasal bones | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of ethmoid bone | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of lacrimal bone | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Multiple open fractures of skull AND/OR face without intracranial injury | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of alveolus | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of orbit | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of mandible, closed | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of occipital bone | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of frontal bone | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of sphenoid bone | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Closed fracture of angle of jaw | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of temporal bone | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of skull due to birth trauma | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of skull and facial bones | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of ethmoid bone | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of lacrimal bone | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Depressed fracture of skull | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Linear fracture of skull due to birth trauma | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Complex wound of head with avulsive loss of part of skull and cranial contents | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of parietal bone | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Craniotomy for decompression of skull fracture | Has focus | True | Fracture of skull | Inferred relationship | Existential restriction modifier | 3 | 
| Fracture of zygoma | Is a | True | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Other and unqualified skull fractures | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Skull fracture NOS | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  | 
| Fracture of skull NOS | Is a | False | Fracture of skull | Inferred relationship | Existential restriction modifier |  |