First Digit> | gcolor="#cccccc"| Range of MIM codes | bgcolor="#cccccc"| Method of inheritance | | 1 | 100000-199999 | Autosomal loci or phenotypes (created before May 15, 1994) |
| 2 | 200000-299999 | Autosomal loci or phenotypes (created before May 15, 1994) |
| 3 | 300000-399999 | X-linked loci or phenotypes |
| 4 | 400000-499999 | Y-linked loci or phenotypes |
| 5 | 500000-599999 | Mitochondrial loci or phenotypes |
| 6 | 600000- | Autosomal loci or phenotypes (created after May 15, 1994) |