In simple words: This code describes a fluid-filled sac (cyst) in the kidney that wasn't present at birth.It's a common finding and is often benign (not cancerous).

N28.1, Cyst of kidney, acquired, refers to a fluid-filled sac within the kidney that develops after birth.This code is used when the cyst is not congenital (present at birth) and is not associated with other specific kidney disorders.

Example 1: A 60-year-old male patient presents with intermittent flank pain.An ultrasound reveals a solitary, simple renal cyst.The patient's medical history indicates no congenital kidney disease. N28.1 is the appropriate code., A 45-year-old female patient undergoes a CT scan as part of a routine checkup. The scan reveals multiple simple renal cysts.The patient reports no relevant medical history. N28.1 is assigned.If the cysts are complex or show concerning features on imaging, further investigation and potentially different coding are warranted., A 72-year-old patient with a history of hypertension is admitted to the hospital for evaluation of abdominal pain.Imaging studies confirm several acquired renal cysts, some of which are complex and warrant further investigation for malignancy. While N28.1 could potentially be used to describe the simpler cysts, additional codes would be required to capture the more complex findings.

Detailed clinical history including age, gender, symptoms (if any), and relevant past medical history.Radiological reports (ultrasound, CT scan, MRI) with clear descriptions of the cyst(s), including size, location, morphology (simple vs. complex), and any associated findings.Confirmation that the cysts are acquired and not congenital.Physician's diagnosis and rationale for coding.

** Differentiate between simple and complex renal cysts, as the latter may require further investigation and different coding.The presence of multiple cysts may also need additional consideration depending on the underlying cause and clinical significance.