| Relevance | Code | Description |
|---|---|---|
| R29.718 | NIHSS score 18 | |
| Q91.3 | Trisomy 18, unspecified | |
| Q91.2 | Trisomy 18, translocation | |
| Z3A.18 | 18 weeks gestation of pregnancy | |
| Q91 | Trisomy 18 and Trisomy 13 | |
| Q91.1 | Trisomy 18, mosaicism (mitotic nondisjunction) | |
| Q91.0 | Trisomy 18, nonmosaicism (meiotic nondisjunction) | |