Diffuse cystic mastopathy of unspecified breast

This code signifies a non-cancerous condition characterized by widespread cyst formation and fibrous tissue proliferation throughout the breast tissue, without specifying which breast is affected. It represents a benign, often bilateral, change in the breast parenchyma, commonly associated with hormonal fluctuations.

Apply this code when documentation indicates diffuse cystic changes or fibrocystic disease affecting the breast(s) but does not specify laterality. This is appropriate when imaging reports (mammogram, ultrasound, MRI) or clinical examination describe generalized cystic mastopathy without a distinct, localized mass.

• Do not use this code if laterality (left or right breast) is documented; instead, select a more specific code from the N60.1- series.
• Distinguish from localized cystic mastopathy (N60.0-) which implies a more circumscribed area of involvement.
• Ensure documentation clearly states "diffuse" or "generalized" involvement to support this code.