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.
Abnormal levels may promote atherosclerosis, and may increase the risk of coronary artery disease (CAD) and stroke. Homocysteine is an amino acid (protein building block). Elevated blood levels may promote atherosclerosis and CAD, as well as blood clots that can lead to a heart attack or stroke.