nephrostomy

DEFINITION of nephrostomy

nephrostomy is the creation of a surgical opening (ostomy) into the kidney for drainage or access, typically percutaneous. Nephrostomy (percutaneous nephrostomy tube, PCNT) involves ultrasound/fluoro‑guided flank puncture (18G needle) into renal calyx → guidewire → serial dilation → 8-14 Fr pigtail/locking‑loop catheter for urine diversion, relieving hydronephrosis from stones, strictures, tumors, or infection; allows antegrade access for pyelography, stenting, or biopsy; temporary (days-weeks) or palliative.

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ETYMOLOGY of nephrostomy

greek nephrectomy(n.)::“excision of a kidney,” 1880, from nephro- “kidney” + -ectomy “a cutting out.” • Nephro-: Greek nephrós (νεφρός) = “kidney.” • -stomy: Greek stóma (στόμα) = “mouth, opening.” • Literal: “Kidney opening” (coined mid‑20th century for percutaneous technique).

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DERIVATIONS of nephrostomy

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Query functionality

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CPT Coding

Primary Codes:

Code	Description
50432	Placement nephrostomy catheter percutaneous (incl. nephrostogram, imaging).
50433	Placement nephroureteral catheter percutaneous (kidney to bladder).
50395	Dilation/establish nephrostomy tract percutaneous (add‑on for PCNL).
50434	Convert nephrostomy to nephroureteral catheter via existing tract.
50435	Exchange nephrostomy/nephroureteral catheter via existing tract.
50389	Removal nephrostomy tube w/fluoro.
50040	Open nephrostomy/nephrotomy w/drainage (rare).

Imaging: Bundled; 75984 nephrostogram if separate.[5]

Procedure Steps (PCNT)

1. Position: Prone/oblique; US/fluoro locate calyx.
2. Access: 18-22G Chiba needle → urine aspirate/opacify.
3. Wire: 0.035-0.038” J‑wire coiled in pelvis.
4. Dilate: Fascial dilators or peel‑away sheath.
5. Tube: Pigtail/lock catheter positioned; cap or drain.[3][1]

Indications: Acute obstruction (sepsis, pain), PCNL access, antegrade stenting.[1]

Related Terms

• nephrotomy: Incision into kidney parenchyma (50040 open).
• Nephroureteral Catheter: Nephrostomy + ureteral stent extension (50433).
• PCNL: Uses nephrostomy tract for stones (50080/81).
• Suprapubic Catheter: Bladder analog (51100 CPT).

Complications: Hemorrhage (1-3%), infection (4%), dislodgement (10-20%), pneumothorax (supracostal).[3]

Maintenance: Flush daily, exchange q1-3mo, monitor output/color.[6]

ICD-10-PCS: 0T9530Z - Drainage kidney percutaneous.[7] Diagnoses: N13.9 (obstruction), N20.0 (stones).[8]

One-Sentence Summary
Nephrostomy (Greek nephro- -stomy “kidney mouth,” CPT 50432 percutaneous placement), diverts urine via flank tube for obstruction/sepsis/PCNL access (N13.9), using Seldinger technique with bundled imaging.[2][4][1][3]

Sources [1] CPT Code 50040: What It Is, Modifiers, Reimbursement - MD Clarity https://www.mdclarity.com/cpt-code/50040 [2] CPT® Code 50040 - Incision Procedures on the Kidney - AAPC https://www.aapc.com/codes/cpt-codes/50040 [3] Tactical Understanding of Urinary Therapeutic Procedure … https://medlearn.com/tactical-understanding-of-urinary-therapeutic-procedure-coding/ [4] CPT® Code 50432 - Other Renal Introduction (Injection/ … https://www.aapc.com/codes/cpt-codes/50432 [5] Percutaneous Procedure CPT Code Update - PMC - NIH https://pmc.ncbi.nlm.nih.gov/articles/PMC4859928/ [6] Urological Supplies - Policy Article (A52521) - CMS https://www.cms.gov/medicare-coverage-database/view/article.aspx?articleid=52521&ver=38 [7] Cardiac Catheterization Coding in ICD-10-PCS https://hiacode.com/blog/education/cardiac-catheterization-coding-in-icd-10-pcs [8] Oncology ICD-10 Codes - Cancer Therapy Advisor https://www.cancertherapyadvisor.com/home/tools/oncology-icd10-codes/ [9] Clearing up confusion surrounding percutaneous … https://www.urologytimes.com/view/clearing-up-confusion-surrounding-percutaneous-nephrolithotomy-coding [10] 50040 - Nephrostomy, nephrotomy with drainage https://genhealth.ai/code/cpt4/50040-nephrostomy-nephrotomy-with-drainage [11] [PDF] Percutaneous Nephrostolithotomy (PCNL) - Boston Scientific https://www.bostonscientific.com/content/dam/bostonscientific/Reimbursement/Urology/2015/2015%20PCNL%20Reimbursement%20Guide.pdf [12] Nephrostomy, Nephroureteral Stent and Nephrolothotomy … https://hialearn.com/coding-course/nephrostomy-nephroureteral-stent-nephrolothotomy-cpt

Med roots Appendix A Prefixes Appendix B Combining Forms Appendix C Suffixes Appendix D Suffix forms