ICD-10-CM > O00-O9A > O20-O29 > O26 > O26.5 O26.5 Maternal hypotension syndrome Non-Billable/Non-Specific Applicable To Supine hypotensive syndrome Codes O26.50Maternal hypotension syndrome, unspecified trimesterO26.51Maternal hypotension syndrome, first trimesterO26.52Maternal hypotension syndrome, second trimesterO26.53Maternal hypotension syndrome, third trimester