DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

K40 Inguinal hernia

  • Header · not billable

K40 is not billable. The category heads 12 billable codes in FY2027, grouped under 6 subdivisions.

Index → code

  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding) → K40.90
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)recurrent → K40.91
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateral → K40.20

Where it sits

  1. Chapter 11 Diseases of the digestive system (K00-K95)
  2. K40-K46 Hernia (K40-K46)
  3. K40 Inguinal hernia
Billable codes
12
Subdivisions
6
CC / MCC codes
4 / 4
HCC V28 codes
0
New FY2027
0
Index entries
27

Codes in K40

  1. K40.0
    Bilateral inguinal hernia, with obstruction, without gangrene
    Header
    Inclusion terms 4

    Inclusion terms

    • Inguinal hernia (bilateral) causing obstruction without gangrene
    • Incarcerated inguinal hernia (bilateral) without gangrene
    • Irreducible inguinal hernia (bilateral) without gangrene
    • Strangulated inguinal hernia (bilateral) without gangrene
  2. K40.00
    Bilateral inguinal hernia, with obstruction, without gangrene, not specified as recurrent
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Bilateral inguinal hernia, with obstruction, without gangrene NOS
  3. K40.01
    Bilateral inguinal hernia, with obstruction, without gangrene, recurrent
    BillableCC
  4. K40.1
    Bilateral inguinal hernia, with gangrene
    Header
  5. K40.10
    Bilateral inguinal hernia, with gangrene, not specified as recurrent
    BillableMCC
    Inclusion terms 1

    Inclusion terms

    • Bilateral inguinal hernia, with gangrene NOS
  6. K40.11
    Bilateral inguinal hernia, with gangrene, recurrent
    BillableMCC
  7. K40.2
    Bilateral inguinal hernia, without obstruction or gangrene
    Header
  8. K40.20
    Bilateral inguinal hernia, without obstruction or gangrene, not specified as recurrent
    Billable
    Inclusion terms 1

    Inclusion terms

    • Bilateral inguinal hernia NOS
  9. K40.21
    Bilateral inguinal hernia, without obstruction or gangrene, recurrent
    Billable
  10. K40.3
    Unilateral inguinal hernia, with obstruction, without gangrene
    Header
    Inclusion terms 4

    Inclusion terms

    • Inguinal hernia (unilateral) causing obstruction without gangrene
    • Incarcerated inguinal hernia (unilateral) without gangrene
    • Irreducible inguinal hernia (unilateral) without gangrene
    • Strangulated inguinal hernia (unilateral) without gangrene
  11. K40.30
    Unilateral inguinal hernia, with obstruction, without gangrene, not specified as recurrent
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Inguinal hernia, with obstruction NOS
    • Unilateral inguinal hernia, with obstruction, without gangrene NOS
  12. K40.31
    Unilateral inguinal hernia, with obstruction, without gangrene, recurrent
    BillableCC
  13. K40.4
    Unilateral inguinal hernia, with gangrene
    Header
  14. K40.40
    Unilateral inguinal hernia, with gangrene, not specified as recurrent
    BillableMCC
    Inclusion terms 2

    Inclusion terms

    • Inguinal hernia with gangrene NOS
    • Unilateral inguinal hernia with gangrene NOS
  15. K40.41
    Unilateral inguinal hernia, with gangrene, recurrent
    BillableMCC
  16. K40.9
    Unilateral inguinal hernia, without obstruction or gangrene
    Header
  17. K40.90
    Unilateral inguinal hernia, without obstruction or gangrene, not specified as recurrent
    Billable
    Inclusion terms 2

    Inclusion terms

    • Inguinal hernia NOS
    • Unilateral inguinal hernia NOS
  18. K40.91
    Unilateral inguinal hernia, without obstruction or gangrene, recurrent
    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 K40

Includes

  • bubonocele
  • direct inguinal hernia
  • double inguinal hernia
  • indirect inguinal hernia
  • inguinal hernia NOS
  • oblique inguinal hernia
  • scrotal hernia

Notes that also apply

Block K40-K46 instructions (Notes 1, Includes 3): printed on the block page.

Chapter 11 instructions (Excludes2 8): printed on the chapter 11 page.

Index entries

  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding) → K40.90
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateral → K40.20
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)not specified as recurrent → K40.90
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateral → K40.90
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)recurrent → K40.91
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralnot specified as recurrent → K40.20
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralrecurrent → K40.21
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)withobstruction → K40.30
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)withgangrene (and obstruction) → K40.40
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralnot specified as recurrent → K40.90
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralrecurrent → K40.91
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralwithobstruction → K40.00
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralwithgangrene (and obstruction) → K40.10
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)withobstructionnot specified as recurrent → K40.30
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralwithobstruction → K40.30
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)withobstructionrecurrent → K40.31
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)withgangrene (and obstruction)not specified as recurrent → K40.40
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralwithgangrene (and obstruction) → K40.40
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)withgangrene (and obstruction)recurrent → K40.41
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralwithobstructionnot specified as recurrent → K40.00
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralwithobstructionrecurrent → K40.01
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralwithgangrene (and obstruction)not specified as recurrent → K40.10
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)bilateralwithgangrene (and obstruction)recurrent → K40.11
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralwithobstructionnot specified as recurrent → K40.30
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralwithobstructionrecurrent → K40.31
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralwithgangrene (and obstruction)not specified as recurrent → K40.40
  • Hernia, hernial (acquired) (recurrent)inguinal (direct) (external) (funicular) (indirect) (internal) (oblique) (scrotal) (sliding)unilateralwithgangrene (and obstruction)recurrent → K40.41

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

Hierarchy