| Db | Link | Name | Definition | Comment | Is a |
|---|---|---|---|---|---|
| OMIM | OMIM:119600 | CLEIDOCRANIAL DYSPLASIA; CCD | — | — | — |
| OMIM | OMIM:119650 | CLEIDORHIZOMELIC SYNDROME | — | — | — |
| OMIM | OMIM:119800 | CLUBFOOT, CONGENITAL, WITH OR WITHOUT DEFICIENCY OF LONG BONES AND/OR MIRROR-IMAGE POLYDACTYLY; CCF | — | — | — |
| OMIM | OMIM:119900 | DIGITAL CLUBBING, ISOLATED CONGENITAL | — | — | — |
| OMIM | OMIM:119915 | CLUSTER HEADACHE, FAMILIAL | — | — | — |
| OMIM | OMIM:120000 | COARCTATION OF AORTA | — | — | — |
| OMIM | OMIM:120040 | COCHLEOSACCULAR DEGENERATION WITH PROGRESSIVE CATARACTS | — | — | — |
| OMIM | OMIM:120050 | COXSACKIEVIRUS B3 SUSCEPTIBILITY; CXB3S | — | — | — |
| OMIM | OMIM:120080 | COLCHICINE RESISTANCE | — | — | — |
| OMIM | OMIM:120100 | FAMILIAL COLD AUTOINFLAMMATORY SYNDROME 1; FCAS1 | — | — | — |
| OMIM | OMIM:120140 | COLLAGEN, TYPE II, ALPHA-1; COL2A1 | — | — | — |
| OMIM | OMIM:120150 | COLLAGEN, TYPE I, ALPHA-1; COL1A1 | — | — | — |
| OMIM | OMIM:120200 | COLOBOMA, OCULAR, AUTOSOMAL DOMINANT | — | — | — |
| OMIM | OMIM:120300 | COLOBOMA OF MACULA | — | — | — |
| OMIM | OMIM:120310 | MOVED TO 120140 | — | — | — |
| OMIM | OMIM:120321 | MOVED TO 120320 | — | — | — |
| OMIM | OMIM:120327 | MOVED TO 113811 | — | — | — |
| OMIM | OMIM:120330 | PAPILLORENAL SYNDROME; PAPRS | — | — | — |
| OMIM | OMIM:120400 | COLOBOMA OF MACULA WITH TYPE B BRACHYDACTYLY | — | — | — |
| OMIM | OMIM:120430 | COLOBOMA OF OPTIC NERVE | — | — | — |
| OMIM | OMIM:120433 | COLOBOMA, OCULAR, WITH OR WITHOUT HEARING IMPAIRMENT, CLEFT LIP/PALATE, AND/OR MENTAL RETARDATION; COB1 | — | — | — |
| OMIM | OMIM:120435 | LYNCH SYNDROME I | — | — | — |
| OMIM | OMIM:120440 | COLONIC VARICES WITHOUT PORTAL HYPERTENSION | — | — | — |
| OMIM | OMIM:120450 | COMEDONES, FAMILIAL DYSKERATOTIC | — | — | — |
| OMIM | OMIM:120460 | MOVED TO 191170 | — | — | — |