Modifier 25 should be appended to the office or other. outpatient service code to indicate that a significant, separately. identifiable E/M service was provided by the same physician. on the same day as the preventive medicine service.
The level of homocysteine in the blood can be measured with a simple blood test that is often, but not always, done after fasting. Homocysteine levels of 12 mmol/L are considered normal and levels below 10 mmol/L are considered desirable.
Doctors aren't sure how or even if homocysteine increases the risk of heart and blood vessel disease, but there appears to be a lcorrelation between high homocysteine levels and damage to the arteries, leading to atherosclerosis (hardening of the arteries) and the formation of blood clots.