Nonspecific abnormal results of function study of kidney

This code signifies abnormal findings from diagnostic tests assessing kidney function, where the specific cause of the abnormality cannot be definitively identified. It indicates that while renal function is compromised or atypical, a precise diagnosis like acute kidney injury, chronic kidney disease, or a specific glomerular disease has not yet been established.

Use this code when laboratory or imaging studies (e.g., GFR, creatinine clearance, renal ultrasound with non-specific findings) reveal impaired or unusual kidney function, but the physician's documentation does not specify a more definitive renal diagnosis. It is appropriate for initial workups or when further investigation is pending to determine the underlying etiology of the renal dysfunction.

• Avoid using this code if a more specific diagnosis, such as acute kidney failure (584.x) or chronic kidney disease (585.x), is documented.
• Always sequence this code after any signs or symptoms leading to the function study, if applicable.
• Ensure documentation clearly states "nonspecific" or "abnormal function study" without a definitive diagnosis.