DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

N25 Disorders resulting from impaired renal tubular function

  • Header · not billable

N25 is not billable. The category heads 5 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

  • Pseudorickets (renal) → N25.0
  • Water-losing nephritis → N25.89
  • Lightwood-Albright syndrome → N25.89

Where it sits

  1. Chapter 14 Diseases of the genitourinary system (N00-N99)
  2. N25-N29 Other disorders of kidney and ureter (N25-N29)
  3. N25 Disorders resulting from impaired renal tubular function
Billable codes
5
Subdivisions
4
CC / MCC codes
2 / 0
HCC V28 codes
0
New FY2027
0
Index entries
44

Codes in N25

  1. N25.0
    Renal osteodystrophy
    Billable
    Inclusion terms 4, Excludes2 1

    Inclusion terms

    • Azotemic osteodystrophy
    • Phosphate-losing tubular disorders
    • Renal rickets
    • Renal short stature

    Excludes2

    • metabolic disorders classifiable to E70-E88 E70 E88
  2. N25.1
    Nephrogenic diabetes insipidus
    BillableCC
    Excludes1 1

    Excludes1

    • diabetes insipidus NOS (E23.2) E23.2
  3. N25.8
    Other disorders resulting from impaired renal tubular function
    Header
  4. N25.81
    Secondary hyperparathyroidism of renal origin
    BillableCC
    Excludes1 1, Excludes2 1

    Excludes1

    • secondary hyperparathyroidism, non-renal (E21.1) E21.1

    Excludes2

    • metabolic disorders classifiable to E70-E88 E70 E88
  5. N25.89
    Other disorders resulting from impaired renal tubular function
    Billable
    Inclusion terms 3

    Inclusion terms

    • Hypokalemic nephropathy
    • Lightwood-Albright syndrome
    • Renal tubular acidosis NOS
  6. N25.9
    Disorder resulting from impaired renal tubular function, 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

Notes that also apply

Block N25-N29 instructions (Excludes2 1): printed on the block page.

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

Index entries

  • Phosphate-losing tubular disorder → N25.0
  • Pseudorickets (renal) → N25.0
  • Lightwood-Albright syndrome → N25.89
  • Lightwood's disease or syndrome (renal tubular acidosis) → N25.89
  • Water-losing nephritis → N25.89
  • Disorder (of)phosphate-losing tubular → N25.0
  • Disorder (of)tubular, phosphate-losing → N25.0
  • Dwarfismrenal → N25.0
  • Infancy, infantile, infantilismrenal → N25.0
  • Nephropathyphosphate-losing → N25.0
  • Osteodystrophyazotemic → N25.0
  • Osteodystrophyrenal → N25.0
  • Osteosisrenal fibrocystic → N25.0
  • Rachitis, rachitism (acute) (tarda)renalis → N25.0
  • Rickets (active) (acute) (adolescent) (chest wall) (congenital) (current) (infantile) (intestinal)kidney → N25.0
  • Rickets (active) (acute) (adolescent) (chest wall) (congenital) (current) (infantile) (intestinal)renal → N25.0
  • Hyperparathyroidismsecondary (renal) → N25.81
  • Acidosis (lactic)kidney, tubular → N25.89
  • Acidosis (lactic)renal (hyperchloremic) (tubular) → N25.89
  • Disease, diseasedLightwood's (renal tubular acidosis) → N25.89
  • Nephropathyhypercalcemic → N25.89
  • Nephropathyhypokalemic (vacuolar) → N25.89
  • Nephropathypotassium depletion → N25.89
  • Nephropathyprotein-losing → N25.89
  • Nephropathywater-losing → N25.89
  • Nephrosis, nephrotic (Epstein's) (syndrome) (congenital)osmotic (sucrose) → N25.89
  • SyndromeLightwood's → N25.89
  • Disorder (of)impaired renal tubular function → N25.9
  • Disorder (of)renal function, impaired (tubular) → N25.9
  • Disorder (of)tubulo-renal function, impaired → N25.9
  • Disease, diseasedrenal (functional) (pelvis)phosphate-losing (tubular) → N25.0
  • Osteopathyin (due to)renal osteodystrophy → N25.0
  • Diabetes, diabetic (mellitus) (sugar)insipidusnephrogenic → N25.1
  • Diabetes, diabetic (mellitus) (sugar)insipidusvasopressin resistant → N25.1
  • Depletionpotassiumnephropathy → N25.89
  • Disorder (of)impaired renal tubular functionspecified NEC → N25.89
  • Disorder (of)tubulo-renal function, impairedspecified NEC → N25.89
  • Disorder (of)kidneyfunctional (tubular) → N25.9
  • Disorder (of)kidneytubular function → N25.9
  • Impaired, impairment (function)kidneydisorder resulting from → N25.9

4 more, longer entries are not listed; the search box finds them by word.

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

Hierarchy