This is really an issue of semantics, and is "hair splitting."
"Stamina" is by definition the physical strength to resist or withstand illness or
fatigue, and is the equivalent of
endurance. In the sense of it as referenced/used in your query, the patient is able to initiate a physical activity, but is unable to continue/complete it because of progressive physical weakness (easy fatiguability), and therefore has to stop. The
R53.1 code "implies" that the patient is too weak to even start the activity, let alone continue or complete it. A better alternative to R53.1 would be
R53.83: Other fatigue, which includes and is synonymous with
fatigue NOS &/or
lack of energy.
This is my best interpretation of this issue. I hope it helps you.
Respectfully submitted, Alan Pechacek, M.D.