| Abbreviations | Meaning |
 | CAS | Congenital Alcoholic Syndrome |
| CNHD | Congenital Nonspherocytic Hemolytic Disease |
| CLE | Centrilobular Emphysema; Congenital Lobar Emphysema; Continuous Lumbar Epidural [anesthesia] |
| CDD | Congenital Diaphragmatic Defect |
| CHD | Congenital Heart Disease |
| CCA | Congenital Contractural Arachnodactyly |
| CONGHD | Congenital Heart Disease |
| EURO-CAT | European Cancer After Transplant [project]; European Register Of Congenital Anomalies And Twins |
| CDH | Ceramide Dihexoside; Congenital Diaphragmatic Hernia; Congenital Dislocation Of Hip; Congenital Dysplasia Of Hip |
| CHB | Chronic Hepatitis B; Complete Heart Block; Congenital Heart Block |
| COIF | Congenital Onychodysplasia Of The Index Finger |
| CHA | Congenital Hypoplastic Anemia |
| CUD | Cause Undetermined; Congenital Urinary Deformity |
| CN | Congenital Nystagmus |
| CHBA | Congenital Heinz Body Hemolytic Anemia |
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