d2t.org
Diagnosis to treatment is the whole of clinical pathway design and the phrase health systems use when measuring how long patients wait. Any organisation working on care pathways, system improvement or patient navigation would find it already in their vocabulary.
D2T carries that, and also data to text, describing a genuine technical category that turns structured data into readable summaries and is now a standard capability rather than a research problem.
The strength of the form is that it names a transition. Institutions overwhelmingly work on transitions, getting something from one state to another, and three characters encoding that does more work than an arbitrary initialism.
The .org fits the research and charitable bodies in the health field exactly.
The name is available. Offers welcome.