Patient directly admitted to cath lab on 12/10 with STEMI and stent placement. On 12/17 the patient returned to the ED complaining of chest pain. The patient was monitored overnight and cathed the next day. The cath was clear so no intervention was needed. The 12/17 encounter is is being flagged for the measure; however, the patient did not have a STEMI during this encounter and while the patient did go to the cath lab, there was no intervention because no intervention was needed. STEMI is listed on the coding summary (as a secondary diagnosis) appropriately since the event occurred within four weeks of the original encounter. Because the logic looks for STEMI in any diagnosis, this patient is inappropriately flagged for the measure.  It is my recommendation that the logic be changed to look for STEMI only as the principal or primary diagnosis. STEMI patients have a high risk of readmission within 30 days so this issue can be common and also does not measure quality care as the intent of the measure.