2253
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- Leonard McCoy develops a revolutionary medical procedure involving brain tissue engrafting. (VOY: "Lifesigns")
Given Leonard McCoy's birthyear as 2227, 2253 would be the year in which McCoy graduated from medical school assuming four years of pre-med, followed by four years of medical school, with McCoy having started college at the age of 18. McCoy's exact medical school graduation date has never been confirmed in a Star Trek production.
| 2252 | 23rd century 2250s | 2254 |
