User blog comment:B214/Question and Answers 4/@comment-24412159-20150126164558/@comment-101.161.14.141-20150127035903

Also;

"Twilight Healing has the ability to heal humans, Devils, Angels andFallen Angels alike. While Twilight Healing can heal injuries instantly, it cannot regenerate amputated limbs, reduced exhaustion, or cure sicknesses. Its healing powers can also be sent as a projectile, but it is less effective than the direct touch. Azazel has stated that, with enough work, it could also send out its healing power throughout an area, and even selectively heal only the allies there without healing enemies."

That's the summary from this site, so it's unlikely that Twilight Healing can replace something as vital and complex as organs if it can't even replace limbs.