Hyperplastic and giant kidney

This code describes an abnormal enlargement of the kidney due to an increase in the number of cells (hyperplasia) or an increase in the size of the cells (giant kidney). It indicates a structural anomaly of the renal parenchyma, often associated with developmental issues or compensatory growth.

Use this code when documentation specifies a diagnosis of hyperplastic kidney or giant kidney. This typically applies to congenital anomalies or conditions where one kidney undergoes compensatory hypertrophy in response to the absence or dysfunction of the contralateral kidney. Supporting documentation should clearly state the specific type of renal enlargement.

• Distinguish from simple renal hypertrophy (N28.89) which implies an increase in size without necessarily an increase in cell number or a "giant" designation.
• Consider laterality if specified (e.g., Q63.30 for unspecified, Q63.31 for right, Q63.32 for left, Q63.33 for bilateral).
• Code any associated congenital anomalies or underlying conditions that contribute to the hyperplastic or giant kidney, if known.