| Source | Code | Name | Case count | Share of cases (%) |
|---|---|---|---|---|
| OUTPAT | OUTPAT_ICD10(Q070) | Arnold-Chiari syndrome | 176 | |
| INPAT | INPAT_ICD10(Q070) | Arnold-Chiari syndrome | 90 | |
| OUTPAT | OUTPAT_ICD10(Q048) | Other specified congenital malformations of brain | 48 | |
| PRIM_OUT | PRIM_OUT_NOT_USED_ICD10(Q070) | Arnold-Chiari syndrome. Not used in endpoint definition. POSSIBLY INACCURATE IN COMPLEX ENDPOINTS! | 47 | |
| INPAT | INPAT_ICD10(Q048) | Other specified congenital malformations of brain | 24 | |
| OUTPAT | OUTPAT_ICD10(Q046) | Congenital cysts in the brain | 22 | |
| INPAT | INPAT_ICD8(74200) | Congenital hydrocephalus, Communicans | 20 | |
| INPAT | INPAT_ICD9(7423A) | Congenital hydrocephalus | 18 | |
| OUTPAT | OUTPAT_ICD10(Q030) | Malformations of aqueduct of Sylvius | 18 | |
| OUTPAT | OUTPAT_ICD10(Q052) | Lumbar spina bifida with hydrocephalus | 18 | |
| OUTPAT | OUTPAT_ICD10(Q078) | Other specified congenital malformations of the nervous system | 18 | |
| OUTPAT | OUTPAT_ICD10(Q039) | Congenital hydrocephalus, unspecified | 17 | |
| INPAT | INPAT_ICD10(Q052) | Lumbar spina bifida with hydrocephalus | 15 | |
| INPAT | INPAT_ICD8(74209) | Congenital hydrocephalus, Unspecified | 15 | |
| OUTPAT | OUTPAT_ICD10(Q02) | Microcephaly | 14 | |
| OUTPAT | OUTPAT_ICD10(Q057) | Lumbar spina bifida without hydrocephalus | 14 | |
| INPAT | INPAT_ICD10(Q039) | Congenital hydrocephalus, unspecified | 12 | |
| INPAT | INPAT_ICD10(Q030) | Malformations of aqueduct of Sylvius | 11 | |
| OUTPAT | OUTPAT_ICD10(Q043) | Other malformations in the form of reduced brain tissue | 11 | |
| OUTPAT | OUTPAT_ICD10(Q049) | Congenital malformation of brain, unspecified | 11 | |
| OUTPAT | OUTPAT_ICD10(Q068) | Other specified congenital malformations of spinal cord | 11 | |
| PRIM_OUT | PRIM_OUT_NOT_USED_ICD10(Q048) | Other specified congenital malformations of brain. Not used in endpoint definition. POSSIBLY INACCURATE IN COMPLEX ENDPOINTS! | 11 | |
| PRIM_OUT | PRIM_OUT_NOT_USED_ICD10(Q052) | Lumbar spina bifida with hydrocephalus. Not used in endpoint definition. POSSIBLY INACCURATE IN COMPLEX ENDPOINTS! | 11 | |
| OUTPAT | OUTPAT_ICD10(Q0400) | Agenesis of corpus callosum | 10 | |
| OUTPAT | OUTPAT_ICD10(Q059) | Spina bifida, unspecified | 10 | |
| INPAT | INPAT_ICD10(Q057) | Lumbar spina bifida without hydrocephalus | 9 | |
| INPAT | INPAT_ICD8(74201) | Congenital hydrocephalus, Non communicans | 8 | |
| OUTPAT | OUTPAT_ICD10(Q069) | Congenital malformation of spinal cord, unspecified | 8 | |
| OUTPAT | OUTPAT_ICD10(Q079) | Congenital malformation of nervous system, unspecified | 8 | |
| PRIM_OUT | PRIM_OUT_NOT_USED_ICD10(Q059) | Spina bifida, unspecified. Not used in endpoint definition. POSSIBLY INACCURATE IN COMPLEX ENDPOINTS! | 8 | |
| OUTPAT | OUTPAT_ICD10(Q0408) | Congenital malformations of corpus callosum | 7 | |
| OUTPAT | OUTPAT_ICD10(Q050) | Cervical spina bifida with hydrocephalus | 7 | |
| INPAT | INPAT_ICD10(Q0400) | Agenesis of corpus callosum | 6 | |
| INPAT | INPAT_ICD10(Q043) | Other malformations in the form of reduced brain tissue | 6 | |
| INPAT | INPAT_ICD10(Q046) | Congenital cysts in the brain | 6 | |
| INPAT | INPAT_ICD10(Q068) | Other specified congenital malformations of spinal cord | 6 | |
| INPAT | INPAT_ICD10(Q078) | Other specified congenital malformations of the nervous system | 6 | |
| INPAT | INPAT_ICD8(74210) | Name not found | 6 | |
| OUTPAT | OUTPAT_ICD10(Q044) | Septo-optic dysplasia | 6 | |
| INPAT | INPAT_ICD10(Q02) | Microcephaly | 5 | |
| INPAT | INPAT_ICD10(Q049) | Congenital malformation of brain, unspecified | 5 | |
| INPAT | INPAT_ICD10(Q059) | Spina bifida, unspecified | 5 | |
| INPAT | INPAT_ICD10(Q069) | Congenital malformation of spinal cord, unspecified | 5 | |
| OUTPAT | OUTPAT_ICD10(Q011) | Nasofrontal encephalocele | 5 | |
| OUTPAT | OUTPAT_ICD10(Q018) | Encephalocele of other sites | 5 | |
| PRIM_OUT | PRIM_OUT_NOT_USED_ICD10(Q043) | Other malformations in the form of reduced brain tissue. Not used in endpoint definition. POSSIBLY INACCURATE IN COMPLEX ENDPOINTS! | 5 | |
| PRIM_OUT | PRIM_OUT_NOT_USED_ICD10(Q057) | Lumbar spina bifida without hydrocephalus. Not used in endpoint definition. POSSIBLY INACCURATE IN COMPLEX ENDPOINTS! | 5 |