DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

N11 Chronic tubulo-interstitial nephritis

  • Header · not billable

N11 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Pyelonephrosis (obstructive) → N11.1
  • Pyelonephritischronic → N11.9
  • Pyelonephrosis (obstructive)chronic → N11.9

Where it sits

  1. Chapter 14 Diseases of the genitourinary system (N00-N99)
  2. N10-N16 Renal tubulo-interstitial diseases (N10-N16)
  3. N11 Chronic tubulo-interstitial nephritis
Billable codes
4
Subdivisions
4
CC / MCC codes
3 / 0
HCC V28 codes
0
New FY2027
0
Index entries
24

Codes in N11

  1. N11.0
    Nonobstructive reflux-associated chronic pyelonephritis
    Billable
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Pyelonephritis (chronic) associated with (vesicoureteral) reflux

    Excludes1

    • vesicoureteral reflux NOS (N13.70) N13.70
  2. N11.1
    Chronic obstructive pyelonephritis
    BillableCC
    Inclusion terms 7, Excludes1 2

    Inclusion terms

    • Pyelonephritis (chronic) associated with anomaly of pelviureteric junction
    • Pyelonephritis (chronic) associated with anomaly of pyeloureteric junction
    • Pyelonephritis (chronic) associated with crossing of vessel
    • Pyelonephritis (chronic) associated with kinking of ureter
    • Pyelonephritis (chronic) associated with obstruction of ureter
    • Pyelonephritis (chronic) associated with stricture of pelviureteric junction
    • Pyelonephritis (chronic) associated with stricture of ureter

    Excludes1

    • calculous pyelonephritis (N20.9) N20.9
    • obstructive uropathy (N13.-) N13
  3. N11.8
    Other chronic tubulo-interstitial nephritis
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Nonobstructive chronic pyelonephritis NOS
  4. N11.9
    Chronic tubulo-interstitial nephritis, unspecified
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Chronic interstitial nephritis NOS
    • Chronic pyelitis NOS
    • Chronic pyelonephritis NOS

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 N11

Includes

  • chronic infectious interstitial nephritis
  • chronic pyelitis
  • chronic pyelonephritis

Use additional code

  • code (B95-B97), to identify infectious agent. B95 B97

Notes that also apply

Block N10-N16 instructions (Includes 1, Excludes1 1): printed on the block page.

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

Index entries

  • Pyelonephrosis (obstructive) → N11.1
  • Obstruction, obstructed, obstructivepyelonephritis (chronic) → N11.1
  • Pyelitis (congenital) (uremic)chronic → N11.9
  • Pyelonephritischronic → N11.9
  • Pyelonephrosis (obstructive)chronic → N11.9
  • Pyelonephritisnonobstructivewith reflux (vesicoureteral) → N11.0
  • Pyelonephritischronicassociated with ureteral obstruction or stricture → N11.1
  • Pyelonephritischronicobstructive → N11.1
  • Pyelonephritisin (due to)obstruction → N11.1
  • Pyelonephritischronicnonobstructive → N11.8
  • Pyelonephritischronicspecified NEC → N11.8
  • Pyelonephritisnonobstructivechronic → N11.8
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)tubulo-interstitial (in)chronic (infectious) → N11.9
  • Pyelitis (congenital) (uremic)withcontracted kidney → N11.9
  • Pyelonephritiswithcontracted kidney → N11.9
  • Pyelonephritischronicnonobstructivewith reflux (vesicoureteral) → N11.0
  • Refluxvesicoureteral (with scarring)withpyelonephritis (chronic) → N11.0
  • Kink, kinkingureter (pelvic junction)withpyelonephritis (chronic) → N11.1
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)tubulo-interstitial (in)chronic (infectious)obstructive → N11.1
  • Obstruction, obstructed, obstructiveureter (functional) (pelvic junction) NECwithpyelonephritis (chronic) → N11.1
  • Strictureureter (postoperative)withpyelonephritis (chronic) → N11.1
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)tubulo-interstitial (in)chronic (infectious)nonobstructive → N11.8
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)tubulo-interstitial (in)chronic (infectious)specified NEC → N11.8
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)tubulo-interstitial (in)chronic (infectious)nonobstructivereflux-associated → N11.0

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

Hierarchy