Herpes gestationis, second trimester

This code represents pemphigoid gestationis, an autoimmune blistering skin condition that occurs during pregnancy. It is characterized by intensely pruritic (itchy) urticarial plaques and bullae (blisters) that typically appear during the second or third trimester.

Use this code when documentation confirms a diagnosis of herpes gestationis (pemphigoid gestationis) specifically occurring in the second trimester of pregnancy. The medical record should clearly indicate the trimester of onset or diagnosis.

• Ensure the documentation specifies "second trimester" for accurate code assignment; otherwise, a different trimester-specific code or unspecified code may be necessary.
• Do not confuse this condition with herpes simplex virus infection, as "herpes gestationis" is a historical misnomer for pemphigoid gestationis.
• Sequence this code as a primary diagnosis when it is the reason for the encounter, or as a secondary diagnosis when it is a co-morbidity affecting pregnancy management.