L51.3
Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome
L51.3 (also written L513) is a billable ICD-10-CM diagnosis code for stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 6 codes in category L51 (Erythema multiforme). The Alphabetic Index lists it under 2 entries. Its coding notes include a Use additional code instruction, 4 Excludes1 entries and 10 Excludes2 entries.
Use additional code
Add the listed code as a secondary code, if known.
- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
- code to identify associated manifestations, such as:
- arthropathy associated with dermatological disorders (M14.8-)
- conjunctival edema (H11.42)
- conjunctivitis (H10.22-)
- corneal scars and opacities (H17.-)
- corneal ulcer (H16.0-)
- edema of eyelid (H02.84-)
- inflammation of eyelid (H01.8-)
- keratoconjunctivitis sicca (H16.22-)
- mechanical lagophthalmos (H02.22-)
- stomatitis (K12.-)
- symblepharon (H11.23-)
- code to identify percentage of skin exfoliation (L49.-)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (10 notes)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- lipomelanotic reticulosis (I89.8)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
- systemic connective tissue disorders (M30-M36)
- viral warts (B07.-)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Home Health Primary
Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.
Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 35 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CInclusion terms
Conditions classified to this code.
- SJS-TEN overlap syndrome
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries