DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

L51 Erythema multiforme

  • Header · not billable

L51 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Index → code

  • Lyell's syndrome → L51.2
  • Necrolysis, toxic epidermal → L51.2
  • Stevens-Johnson disease or syndrome → L51.1

Where it sits

  1. Chapter 12 Diseases of the skin and subcutaneous tissue (L00-L99)
  2. L49-L54 Urticaria and erythema (L49-L54)
  3. L51 Erythema multiforme
Billable codes
6
Subdivisions
6
CC / MCC codes
3 / 0
HCC V28 codes
0
New FY2027
0
Index entries
18

Codes in L51

  1. L51.0
    Nonbullous erythema multiforme
    Billable
  2. L51.1
    Stevens-Johnson syndrome
    BillableCC
  3. L51.2
    Toxic epidermal necrolysis [Lyell]
    BillableCC
  4. L51.3
    Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • SJS-TEN overlap syndrome
  5. L51.8
    Other erythema multiforme
    Billable
  6. L51.9
    Erythema multiforme, unspecified
    Billable
    Inclusion terms 4

    Inclusion terms

    • Erythema iris
    • Erythema multiforme major NOS
    • Erythema multiforme minor NOS
    • Herpes iris

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 L51

Excludes1

  • staphylococcal scalded skin syndrome (L00) L00
  • Ritter's disease (L00) L00

Use additional code

  • code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5) T36 T50
  • code to identify associated manifestations, such as:
  • arthropathy associated with dermatological disorders (M14.8-) M14.8
  • conjunctival edema (H11.42) H11.42
  • conjunctivitis (H10.22-) H10.22
  • corneal scars and opacities (H17.-) H17
  • corneal ulcer (H16.0-) H16.0
  • edema of eyelid (H02.84-) H02.84
  • inflammation of eyelid (H01.8-) H01.8
  • keratoconjunctivitis sicca (H16.22-) H16.22
  • mechanical lagophthalmos (H02.22-) H02.22
  • stomatitis (K12.-) K12
  • symblepharon (H11.23-) H11.23
  • code to identify percentage of skin exfoliation (L49.-) L49

Notes that also apply

Block L49-L54 instructions (Excludes1 2): printed on the block page.

Chapter 12 instructions (Excludes2 10): printed on the chapter 12 page.

Index entries

  • Ectodermosis erosiva pluriorificialis → L51.1
  • Stevens-Johnson disease or syndrome → L51.1
  • Lyell's syndrome → L51.2
  • Necrolysis, toxic epidermal → L51.2
  • SyndromeStevens-Johnson syndrome → L51.1
  • Epidermolysisnecroticans combustiformis → L51.2
  • Lyell's syndromedue to drug → L51.2
  • Stevens-Johnson disease or syndrometoxic epidermal necrolysis overlap → L51.3
  • Erythema, erythematous (infectional) (inflammation)iris → L51.9
  • Erythema, erythematous (infectional) (inflammation)multiforme (major) (minor) → L51.9
  • Herpes, herpesvirus, herpeticiris (vesicular erythema multiforme) → L51.9
  • Erythema, erythematous (infectional) (inflammation)multiforme (major) (minor)nonbullous → L51.0
  • Erythema, erythematous (infectional) (inflammation)multiforme (major) (minor)bullous, bullosum → L51.1
  • Erythema, erythematous (infectional) (inflammation)multiforme (major) (minor)conjunctiva → L51.1
  • SyndromeStevens-Johnson syndrometoxic epidermal necrolysis overlap → L51.3
  • Erythema, erythematous (infectional) (inflammation)multiforme (major) (minor)specified NEC → L51.8
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)in (due to)erythemamultiforme → L51.9
  • Arthropathyin (due to)erythemamultiforme → L51.9 [M14.8-]

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

Hierarchy