N25: Disorders resulting from impaired renal tubular function

N25 refers to Disorders resulting from impaired renal tubular function, a group of kidney disorders characterized by impaired tubular function, structural abnormalities like contraction or small size, and other non-specific renal pathologies impacting kidney health and urine formation.

Symptoms

• Polyuria and polydipsia – Seen in tubular disorders (N25)
• Hypertension – Common with contracted or small kidneys (N26, N27)
• Proteinuria and hematuria – Indicative of general kidney damage
• Progressive renal insufficiency – Across all disorders
• Electrolyte imbalances – Due to tubular dysfunction

Diagnosis

Diagnosis of Disorders resulting from impaired renal tubular function includes kidney function tests (eGFR, creatinine), imaging (renal ultrasound, CT scan), urinalysis, electrolyte panels, and sometimes renal biopsy to investigate underlying structural or tubular abnormalities.

ICD10 Code Usage

ICD10 code N25 is used by nephrologists, urologists, and internists to document a range of renal abnormalities, facilitate further diagnostic evaluations, plan management strategies, and monitor disease progression or complications.

Related Codes

• N26 – Unspecified contracted kidney
• N27 – Small kidney of unknown cause
• N28 – Other disorders of kidney and ureter, not elsewhere classified
• N29 – Other disorders of kidney and ureter in diseases classified elsewhere

FAQs

Q1: What is ICD10 code N25?
A: It refers to Disorders resulting from impaired renal tubular function, encompassing disorders affecting renal tubular function, kidney size, and non-specific renal abnormalities.

Q2: What causes impaired renal tubular function (N25)?
A: Conditions like Fanconi syndrome, tubulointerstitial nephritis, genetic mutations, and nephrotoxin exposure can impair tubular function.

Q3: What is a contracted kidney (N26)?
A: It refers to a shrunken kidney often resulting from chronic scarring due to infections, reflux nephropathy, or vascular diseases.

Q4: How is a small kidney of unknown cause (N27) managed?
A: Management focuses on monitoring kidney function, managing blood pressure, and preventing progression of kidney disease when possible.

Q5: What are examples of N28 and N29?
A: N28 includes cysts, infarctions, or fibrosis of the kidney not classified elsewhere; N29 refers to renal complications occurring secondary to other systemic diseases.

Conclusion

ICD10 code N25 ensures comprehensive classification and management of Disorders resulting from impaired renal tubular function, supporting early intervention strategies that aim to preserve kidney function and prevent end-stage renal disease.