2027 ICD-10-CM Diagnosis Code L43.2Lichenoid drug reaction
ICD-10-CM Codes›L00–L99›L40-L45›L43
- Billable — Valid for Submission
- Not Chronic
L43.2 is a billable ICD-10-CM diagnosis code for lichenoid drug reaction. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 606 through 607. Coders also document this condition as drug-induced oral lichenoid reaction. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Drug induced or toxic related condition and Other specified inflammatory condition of skin.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Drug-induced oral lichenoid reaction
- Lichenoid allergic contact reaction
- Lichenoid allergic contact reaction caused by amalgam
- Lichenoid drug eruption
- Oral lichenoid reaction
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to L43.2: its own notes plus those printed at L43 and Chapter 12. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- 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.-)
Use Additional Code
Add a second code, after this one, to fully describe the condition.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Lichen Planus
an inflammatory, pruritic disease of the skin and mucous membranes, which can be either generalized or localized. it is characterized by distinctive purplish, flat-topped papules having a predilection for the trunk and flexor surfaces. the lesions may be discrete or coalesce to form plaques. histologically, there is a saw-tooth pattern of epidermal hyperplasia and vacuolar alteration of the basal layer of the epidermis along with an intense upper dermal inflammatory infiltrate composed predominantly of t-cells. etiology is unknown.
Patient EducationClinical
Drug Reactions
Most of the time, medicines make our lives better. They reduce aches and pains, fight infections, and control problems such as high blood pressure or diabetes. But medicines can also cause unwanted reactions, such as drug interactions, side effects, and allergies.
The full article covers:
- What is a drug interaction?
- What are side effects?
- What are drug allergies?
- How can I stay safe when taking medicines?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L43.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L43.2Overview
What is the ICD-10 code for lichenoid drug reaction?
The ICD-10-CM code for lichenoid drug reaction is L43.2 (sometimes written as L432). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is L43.2 (Lichen planus) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report lichenoid drug reaction on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does L43.2 group to?
When lichenoid drug reaction is the principal diagnosis on an inpatient stay, it groups to MS-DRG 607, 606, with relative weights from 0.8772 to 1.5721 depending on complications. Higher weights mean higher Medicare reimbursement.
Can L43.2 be reported with a code from L66.1?
Not as a rule. The Excludes1 note at L43, which applies to L43.2, lists "lichen planopilaris (L66.1-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
