Denominator of CMS60 & CMS53 says:
AND: "Occurrence A of Diagnostic Study, Result: Hospital Measures-ECG (result: 'Hospital Measures-Acute or Evolving MI')"
AND NOT:
AND: "Occurrence A of Diagnostic Study, Result: Hospital Measures-ECG (result: 'Hospital Measures-Acute or Evolving MI')"
AND: "Occurrence A of Diagnostic Study, Result: Hospital Measures-ECG (result: 'NSTEMI')"
AND NOT: "Occurrence A of Diagnostic Study, Result: Hospital Measures-ECG (result: 'NSTEMI')"

Need a explanation for the above mentioned conditions, as to what exactly are the conditions specifying.

As when I come across a scenario while testing,
where a patient has Diagnostic Study, Result: Hospital Measures-ECG (result: 'Hospital Measures-Acute or Evolving MI') for a particular visit it will move ahead and check for the same Diagnostic Study, Result as 'AND NOT' , but since the patient is already having Diagnostic Study, Result: Hospital Measures-ECG (result: 'Hospital Measures-Acute or Evolving MI'), the AND NOT condition will never get satisfied and the patient would never qualify for the denominator.