ICD-10-CM > O00-O9A > O20-O29 > O26 > O26.8 > O26.81 O26.81 Pregnancy related exhaustion and fatigue Non-Billable/Non-Specific Codes O26.811Pregnancy related exhaustion and fatigue, first trimesterO26.812Pregnancy related exhaustion and fatigue, second trimesterO26.813Pregnancy related exhaustion and fatigue, third trimesterO26.819Pregnancy related exhaustion and fatigue, unspecified trimester