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.
The normal range of homocysteine levels for people up to age 30 is 4.6 to 8.1 micromoles per liter (mcmol/L). Between ages 30 and 59, normal ranges are 6.3 to 11.2 mcmol/L for men and 4.5 to 7.9 mcmol/L for women.