Pre-existing type 1 diabetes mellitus, in the puerperium

This code signifies a patient with a pre-existing diagnosis of Type 1 diabetes mellitus who is currently in the puerperium (postpartum period). It indicates that the diabetes was present prior to the pregnancy and continues to be managed during the six-week period following childbirth.

Apply this code when documentation clearly states a pre-existing Type 1 diabetes diagnosis and the patient is within the puerperal period. This includes scenarios where the patient is admitted for postpartum care or presents for follow-up appointments related to their diabetes management after delivery.

• Always sequence this code after the primary obstetric code (e.g., O80-O82 for delivery).
• Ensure documentation specifies "Type 1" diabetes and "pre-existing" to differentiate from gestational diabetes or Type 2.
• Do not use this code if the diabetes was diagnosed during the current pregnancy (gestational diabetes) or if the patient is no longer in the puerperium.