ICD-10-CM › L00-L99 › L49-L54 › L51 Erythema multiforme › L51.9
Erythema multiforme, unspecified
ValidICD-10-CM diagnosis code.
Valid for claims with a date of service in the current code year.
What has happened to this code
Every change the publisher made, from 2007 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.
- FY2007 Added to the draft code set draft Erythema multiforme, unspecified
Official coding rules
Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.
Inherited from L51 Erythema multiforme
Excludes1 - never coded here
- staphylococcal scalded skin syndrome (L00)
- Ritter's disease (L00)
Use additional code
- code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
- code to identify associated manifestations, such as:
- code to identify percentage of skin exfoliation (L49.-)
- 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-)
Inherited from the L49-L54 section Urticaria and erythema (L49-L54)
Excludes1 - never coded here
- Lyme disease (A69.2-)
- rosacea (L71.-)
How CDC's index refers to this code
Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.
- Herpesvirus
- Arthropyosis
- Erythroderma
- Pyoarthrosis
- Septic > joint
- Abscess > joint
- Febris, febrile
- Fever > herpetic
- Human > herpesvirus
- Pyemia, pyemic > joint
- Disorder > erythematous
- Pyarthritis, pyarthrosis
- Fever > viral hemorrhagic
- Arthritis, arthritic > septic
- Arthritis, arthritic > purulent
- Suppuration, suppurative > joint
- Arthritis, arthritic > suppurative
- Syndrome > acquired immunodeficiency
- Arthritis, arthritic > in > infection
- Virus, viral > human immunodeficiency
- Syndrome > immunodeficiency > acquired
- Disease, diseased > joint > suppurative
- Infection, infected, infective > herpes
- Polyarthritis, polyarthropathy > infective
- Arthritis, arthritic > in > coliform bacilli
- Arthritis, arthritic > infectious or infective
- Disease, diseased > Castleman > HHV-8-associated
- Infection, infected, infective > herpesvirus, herpesviral
- Erythema, erythematous > iris
- Erythema, erythematous > multiforme
- Herpes, herpesvirus, herpetic > iris
- Arthropathy > in > erythema > multiforme
- Arthritis, arthritic > in > erythema > multiforme
Codes in the same group
| Code | Description | Status |
|---|---|---|
| L51.0 | Nonbullous erythema multiforme | Valid |
| L51.1 | Stevens-Johnson syndrome | Valid |
| L51.2 | Toxic epidermal necrolysis [Lyell] | Valid |
| L51.3 | Stevens-Johnson syndrome-toxic epidermal necrolysis overlap syndrome | Valid |
| L51.8 | Other erythema multiforme | Valid |