DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

N20 Calculus of kidney and ureter

  • Header · not billable

N20 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Stone(s)renal → N20.0
  • Stone(s)kidney → N20.0
  • Pyelonephritiscalculous → see category N20

Where it sits

  1. Chapter 14 Diseases of the genitourinary system (N00-N99)
  2. N20-N23 Urolithiasis (N20-N23)
  3. N20 Calculus of kidney and ureter
Billable codes
4
Subdivisions
4
CC / MCC codes
2 / 0
HCC V28 codes
0
New FY2027
0
Index entries
23

Codes in N20

  1. N20.0
    Calculus of kidney
    Billable
    Inclusion terms 5

    Inclusion terms

    • Nephrolithiasis NOS
    • Renal calculus
    • Renal stone
    • Staghorn calculus
    • Stone in kidney
  2. N20.1
    Calculus of ureter
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Calculus of the ureteropelvic junction
    • Ureteric stone
  3. N20.2
    Calculus of kidney with calculus of ureter
    BillableCC
  4. N20.9
    Urinary calculus, unspecified
    Billable

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At N20

Inclusion terms

  • Calculous pyelonephritis

Excludes1

  • nephrocalcinosis (E83.59) E83.59
  • that with hydronephrosis (N13.2) N13.2

Notes that also apply

Chapter 14 instructions (Excludes2 8): printed on the chapter 14 page.

Index entries

  • Calculus, calculi, calculouspyelonephritis (impacted) (recurrent) → see category N20
  • Pyelonephritiscalculous → see category N20
  • Calculus, calculi, calculouskidney (impacted) (multiple) (pelvis) (recurrent) (staghorn) → N20.0
  • Calculus, calculi, calculouspyelitis (impacted) (recurrent) → N20.0
  • Stone(s)kidney → N20.0
  • Stone(s)renal → N20.0
  • Calculus, calculi, calculousureter (impacted) (recurrent) → N20.1
  • Calculus, calculi, calculousureteropelvic junction → N20.1
  • Ureteritisdue to calculus → N20.1
  • Anuriacalculous (impacted) (recurrent) → N20.9
  • Calculus, calculi, calculousanuria (impacted) (recurrent) → N20.9
  • Calculus, calculi, calculousurinary (duct) (impacted) (passage) (tract) → N20.9
  • Stone(s)urinary (duct) (impacted) (passage) → N20.9
  • Pyelitis (congenital) (uremic)withcalculus → see category N20
  • Pyelitis (congenital) (uremic)chronicwith calculus → see category N20
  • Pyelonephritiswithcalculus → see category N20
  • Pyelonephritischronicwith calculus → see category N20
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)kidneywith calculus → N20.0
  • Calculus, calculi, calculousdiverticulumkidney → N20.0
  • Infection, infected, infective (opportunistic)kidney (cortex) (hematogenous)with calculus → N20.0
  • Calculus, calculi, calculouskidney (impacted) (multiple) (pelvis) (recurrent) (staghorn)with calculus, ureter → N20.2
  • Calculus, calculi, calculousureter (impacted) (recurrent)with calculus, kidney → N20.2
  • Ureteritisdue to calculuswith calculus, kidney → N20.2

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy