Accessory nipple

This code represents the presence of a supernumerary nipple, also known as a polymastia or polythelia, which is an extra nipple or breast tissue that develops along the embryonic milk line. These accessory nipples are typically benign and can vary in size and appearance, from a small pigmented spot to a fully formed nipple with areola.

Use this code when documentation indicates the diagnosis of an accessory nipple. This is often an incidental finding during a physical examination or when a patient presents with concerns about an unusual skin lesion. Documentation should clearly identify the presence of an extra nipple or breast tissue.

• Do not confuse with congenital absence of nipple (Q83.0) or inverted nipple (N64.3).
• If the accessory nipple is associated with other congenital anomalies, consider additional codes to fully describe the patient's condition.
• This code is typically a secondary diagnosis unless the accessory nipple is the primary reason for the encounter (e.g., for cosmetic removal).