| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Hexadactyly (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Phalanx of supernumerary digit of hand | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Bifid digit | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Short rib-polydactyly syndrome, non-Majewski type | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Polydactyly of toes (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Short rib-polydactyly syndrome, Majewski type | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Polydactyly of fingers | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Supernumerary digits, unspecified | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Polydactyly NOS | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Short rib-polydactyly syndrome, Majewski type | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Supernumerary forepaw phalanx | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Polydactyly of thumb | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Hydrometrocolpos, postaxial polydactyly, and congenital heart malformation (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Cleft hand with polydactyly | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Syndactyly type 2 (disorder) | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Mirror polydactyly, vertebral segmentation and limb defect syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Holoprosencephaly and postaxial polydactyly syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Bilateral hypoplasia of tibia and postaxial polydactyly syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Postaxial polydactyly and intellectual disability syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Brain malformation, congenital heart disease, postaxial polydactyly syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Hirschsprung disease with deafness and polydactyly syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Persistent Mullerian derivative with lymphangiectasia and polydactyly syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Dicheirus (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Short rib polydactyly syndrome type I (disorder) | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Cortical blindness, intellectual disability, polydactyly syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Absent tibia, polydactyly, arachnoid cyst syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Polydactyly myopia syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Preaxial polydactyly, colobomata, intellectual disability syndrome (disorder) | Is a | False | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Dandy-Walker malformation with postaxial polydactyly syndrome | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Hyperphalangy | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Intellectual disability, polydactyly, uncombable hair syndrome | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Polysyndactyly (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Ectrodactyly polydactyly syndrome | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Postaxial polydactyly, dental, vertebral anomalies syndrome | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Ohdo syndrome, Say-Barber-Biesecker-Young-Simpson variant | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Short rib polydactyly syndrome | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Radial polydactyly | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Excision of radial digit and skeletal repair for polydactyly (procedure) | Has focus | True | Polydactyly (disorder) | Inferred relationship | Some | 3 | 
| Excision of ulnar digit and skeletal repair for polydactyly | Has focus | True | Polydactyly (disorder) | Inferred relationship | Some | 3 | 
| Autosomal dominant preaxial polydactyly, upper back hypertrichosis syndrome (disorder) | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  | 
| Mirror-image polydactyly | Is a | True | Polydactyly (disorder) | Inferred relationship | Some |  |