Diseases of the skin, subcu comp pregnancy, third trimester

This code signifies a maternal diagnosis of a skin or subcutaneous tissue disorder that arises or is exacerbated during pregnancy, specifically in the third trimester. This includes conditions like pruritic urticarial papules and plaques of pregnancy (PUPPP), pemphigoid gestationis, or severe eczema, which are directly impacting the pregnant patient.

Apply this code when documentation clearly indicates a pre-existing or new onset dermatological condition affecting the pregnant patient during her third trimester. The medical record should specify the type of skin disease and confirm its presence or complication during the final trimester of gestation.

• Always sequence this code after the primary obstetric code (e.g., O42.x, O47.x, O60.x) if the skin condition is a complication of the pregnancy itself.
• Do not use this code for incidental skin conditions unrelated to the pregnancy or for conditions that resolved prior to the third trimester.
• Ensure the specific skin condition is also coded, using an additional code from Chapter 12 (Diseases of the skin and subcutaneous tissue) to fully describe the patient's diagnosis.