pyelolithotomy

DEFINITION of pyelolithotomy

pyelolithotomy is an open surgical procedure in which the surgeon makes an incision directly into the renal pelvis to remove a calculus lodged there. It is distinguished from nephrolithotomy, which incises the kidney parenchyma itself, and from percutaneous nephrostolithotomy, which accesses the stone through a small skin puncture rather than an open flank incision. The procedure exposes the pelvis through a flank approach, sometimes with partial rib resection, after which the stone is extracted and the pelviotomy is closed, often over a drain. A variant, coagulum pyelolithotomy, uses an instilled clotting agent to bind fragmented or “gravel-like” stone debris into a single mass for easier removal. Because minimally invasive options (ureteroscopy, percutaneous nephrolithotomy, and extracorporeal shock wave lithotripsy) now manage most stones, open pyelolithotomy today is reserved mainly for large, complex, or partially branched staghorn calculi, or when anatomy or morbid obesity precludes endoscopic access.

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ETYMOLOGY of pyelolithotomy

greek

Component	Origin	Meaning
pyelo-	Greek pyelos (πύελος), “trough, basin, tub"	"pelvis,” “basin” — refers here to the renal pelvis
lith-	Greek lithos (λίθος), “stone"	"stone,” “calculus”
-otomy	Greek -tomia, from temnein (“to cut”)	Noun-forming suffix — “incision into,” “cutting”

The term is a modern medical compound built directly from three Greek roots rather than passing through a long English etymological history: pyelo- (“basin/pelvis”) + lith- (“stone”) + -otomy (“incision into”), literally “cutting into the pelvis to remove a stone.” The same pyelo- root appears throughout renal terminology in pyelonephritis (inflammation of the kidney and pelvis) and pyeloplasty (surgical repair of the pelvis), while the same lith- root connects this term to the broader -lithiasis family: nephrolithiasis (kidney stones), ureterolithiasis (ureter stones), and lithotripsy (stone-crushing). The suffix -otomy is highly productive across surgery, appearing in tonsillotomy, nephrotomy, and craniotomy, and is distinguished from the similar-sounding -ectomy (“cutting out/removal”) and -ostomy (“creating an opening”), since -otomy denotes only the incision itself.

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🔀 ALIASES / ALTERNATE TERMS

• Pelviolithotomy (older, equivalent spelling used interchangeably in CPT nomenclature)
• Pyelotomy with removal of calculus (the full CPT code descriptor phrase)
• Coagulum pyelolithotomy (subtype using an instilled coagulant to consolidate stone fragments before extraction; same CPT code)

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🔗 RELATED TERMS

• pyelotomy — the parent term for any incision into the renal pelvis; pyelolithotomy is the stone-removal variant, distinct from pyelotomy with exploration or with drainage.
• nephrolithotomy — incision into the kidney parenchyma (rather than the pelvis) to remove a stone; often confused with pyelolithotomy but anatomically distinct.
• Percutaneous nephrostolithotomy / pyelostolithotomy — the minimally invasive, image-guided equivalent performed through a skin puncture rather than an open incision; billed under a different CPT family (50080/50081).
• lithotripsy — fragmentation of a stone (mechanically, ultrasonically, or by shock wave) as an alternative to open removal.
• calculus — the mineral concretion being removed; when in the renal pelvis or kidney it is coded as N20.0.
• ureterolithiasis — the analogous condition and removal procedure for stones located in the ureter rather than the renal pelvis.
• Hydronephrosis — dilation of the renal pelvis from obstruction, frequently caused by the same calculus that prompts pyelolithotomy; coded separately as N13.2 when obstruction and calculus coexist.
• pyeloplasty — reconstructive repair of the renal pelvis (e.g., for ureteropelvic junction obstruction), a distinct but anatomically related procedure sometimes performed alongside stone removal.

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CODING CORNER

🏥 ICD-10-CM CODES

Renal and Ureteral Calculus (Indication for Pyelolithotomy)

Code	Description
N20.0	Calculus of kidney
N20.1	Calculus of ureter
N20.2	Calculus of kidney with calculus of ureter
N20.9	Urinary calculus, unspecified
N13.2	Hydronephrosis with renal and ureteral calculous obstruction

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🔧 COMMON CPT CODES (Pyelolithotomy & Related Pyelotomy Procedures)

CPT Code	Description
50130	Pyelotomy; with removal of calculus (pyelolithotomy, pelviolithotomy, including coagulum pyelolithotomy)
50120	Pyelotomy; with exploration
50125	Pyelotomy; with drainage, pyelostomy
50080	Percutaneous nephrostolithotomy or pyelostolithotomy, with or without dilation, endoscopy, lithotripsy, stenting, or basket extraction; up to 2 cm (minimally invasive alternative)
50081	Percutaneous nephrostolithotomy or pyelostolithotomy, same approach; over 2 cm
52352	Cystourethroscopy, with ureteroscopy and/or pyeloscopy; with removal or manipulation of calculus (endoscopic alternative)

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⚠️ Coding Note: Report 50130 only for a true open incisional removal of a renal-pelvis stone; do not use it for percutaneous or endoscopic stone removal, which have their own dedicated code families (50080/50081 or 52352). Sequence the underlying calculus diagnosis (N20.0, N20.1, or N20.2) as the reason for surgery, and append laterality via modifier -RT/-LT since the CPT code itself carries no laterality distinction. Per AAPC coding guidance, N20.0 and N13.2 should not both be reported for the same encounter — if hydronephrosis from the calculus is documented, N13.2 alone captures the obstructive component and takes precedence over the isolated calculus code. Because open pyelolithotomy is now uncommon, payers may require documentation justifying why less invasive options (ureteroscopy, PCNL, ESWL) were unsuitable — e.g., a large or branched staghorn stone or failed prior endoscopic attempt — before authorizing 50130.

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DERIVATIONS of pyelolithotomy

TABLE definition AS Definition
FROM #medterm 
WHERE length(filter(roots, (word) => econtains([[pyelolithotomy]].roots, word))) > 0 AND file.name != [[pyelolithotomy]].file.name
SORT file.name ASC

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Query functionality

TABLE definition AS Definition
FROM #medterm 
WHERE file.name != this.file.name
AND any(contains(this.definition, definition))

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