Hypertrophy of kidney

This code signifies an abnormal enlargement of the kidney, typically due to an increase in the size of its cells rather than an increase in cell number. It often represents a compensatory mechanism in response to the loss or impaired function of the contralateral kidney, or it can be a primary condition.

Use this code when documentation explicitly states "hypertrophy of kidney" without further specification of a more precise underlying cause or type. This is commonly seen in cases of unilateral renal agenesis, nephrectomy, or severe chronic kidney disease affecting one kidney, leading to compensatory enlargement of the remaining kidney.

• Do not use this code if a more specific diagnosis, such as hydronephrosis or a renal mass, is documented as the cause of kidney enlargement.
• Always review the medical record for laterality (left, right, or bilateral) and use the appropriate sub-codes if specified.
• Consider sequencing this code after the primary condition or cause leading to the hypertrophy, if applicable.