disease has major feature dementia postencephalitic Parkinson disease https://github.com/monarch-initiative/mondo/issues/9097 https://www.malacards.org/card/postencephalitic_parkinson_disease UMLS:C0030568 GARD:0019370 postencephalitic Parkinsonism ICD10CM:G21.3 SCTID:19972008 NCIT:C34898 EFO:1001402 A disease believed to be caused by a viral illness that triggers degeneration of the nerve cells in the substantia nigra. Overall, this degeneration leads to clinical parkinsonism. postencephalitic parkinsonism MONDO:0001945 MEDGEN:10591 Orphanet:97349 DOID:14332 MESH:D010301 secondary Parkinson disease parkinsonian disorder