| Value | Code Name | Code | Code System | Code Description |
|---|---|---|---|---|
| Control brain | Control brain | Control brain=If without neurological and psychiatric troubles, and without HD-IT15 CAG repeat expansion | ||
| Huntington disease, grade 0 | Huntington disease, grade 0 | Huntington disease, grade 0=If without neurological and psychiatric troubles, but with HD-IT15 CAG repeat expansion |