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 homocysteine test may be used a few different ways: 1  A health practitioner may order a homocysteine test to determine if a person has a vitamin B12 or folate deficiency. 2  The homocysteine concentration may be elevated before B12 and folate tests are abnormal. The homocysteine concentration may be elevated before B12 and folate tests are abnormal. 2  Some health practitioners may recommend homocysteine testing in malnourished individuals, the elderly, who often absorb less vitamin B12 from their diet, and individuals with poor nutrition, such as drug or alcohol addicts.