Multi-Ethnic Study of Atherosclerosis

8.8 Use code 20 (scan completed) if the participant shows up for the exam and the scan is done. Also use code 20 if the scan is only partially completed, 8.9 Use codes 21–24 if the scan is not completed, for a reason other than those covered by code 04 (see 8.7, above). 8.91 Use code 21 if the person refuses to undergo the scan. ................
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