This measure says that to be in the numerator, the deltaBP must be >= 10mmHg. The description in LOINC, implies that improvement should be a NEGATIVE number.

http://s.details.loinc.org/LOINC/71789-2.html?sections=Simple

>>> We can acknowledge the ambiguity between the LOINC code and the measure logic and clarify that we want the formula to be "Delta BP = baseline BP minus follow-up BP". We will do this in the next annual update.