2026 ICD-10-CM Diagnosis Code L43.9Lichen planus, unspecified

AHRQ’s CCSR groups this code into broader clinical categories.

• 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.

• Lichen Planus, Oral

  oral lesions accompanying cutaneous lichen planus or often occurring alone. the buccal mucosa, lips, gingivae, floor of the mouth, and palate are usually affected (in a descending order of frequency). typically, oral lesions consist of radiating white or gray, velvety, threadlike lines, arranged in a reticular pattern, at the intersection of which there may be minute, white, elevated dots or streaks (wickham's striae). (jablonski, illustrated dictionary of dentistry)

• Onycholysis

  separation of nail plate from the underlying nail bed. it can be a sign of skin disease, infection (such as onychomycosis) or tissue injury.

• Onychomycosis

  a fungal infection of the nail, usually caused by dermatophytes; yeasts; or nondermatophyte molds.

• Atrophic Lichen Planus

  a rare form of lichen planus that is characterized by well-demarcated, white-bluish papules or plaques with central atrophy.

• Bullous Lichen Planus

  a rare form of lichen planus that is characterized by the formation of vesico-bullous lesions on top of preexisting lichen planus papules or on normal skin.

• Hypertrophic Lichen Planus

  a form of lichen planus that is characterized by plaques of markedly thickened skin that is often extremely pruritic and localized to the lower legs. it can result in permanent pigmentation and scarring.

• Lichen Planus

  a chronic, recurrent, pruritic inflammatory disorder of unknown etiology that affects the skin and mucus membranes. it presents with rashes and papules that tend to resolve spontaneously. it may be associated with hepatitis c. certain drugs that contain arsenic or bismuth are associated with reactions mimicking lichen planus.

• Lichen Planus-Like Keratosis|Lichenoid Keratosis

  a benign intraepidermal squamoproliferative neoplasm characterized by irregular acanthosis, hyperkeratosis, parakeratosis, and prominent chronic inflammation.

• Lichenoid Drug Eruption|Drug-induced Lichen Planus|Drug-induced Lichen Planus

  a red or violaceous flat-topped, papular eruption that is induced by exposure to a variety of medications or environmental agents.

• Oral Lichen Planus

  a chronic, autoimmune inflammatory condition of the mucous membranes in the oral cavity that affects approximately two percent of the population and is most often seen in middle aged women. it is characterized by white, lacy patches; red, swollen tissue; papules and plaques; or open sores. the lesions are typically bilateral.

• Exosome Component 10|Autoantigen PM-SCL|Autoantigen PM/Scl|EC 3.1.13.-|EXOSC10|P100 Polymyositis-Scleroderma Overlap Syndrome-Associated Autoantigen|PM/Scl-100|Polymyositis/Scleroderma Autoantigen 100 kDa|Polymyositis/Scleroderma Autoantigen 2

  exosome component 10 (885 aa, ~101 kda) is encoded by the human exosc10 gene. this protein plays a role in the maturation and degradation of rna.

• Other Overlap Syndromes|Other overlap syndromes

  evidence of other overlap syndromes not specified elsewhere.

• Overlap Syndrome

  an autoimmune, connective tissue disorder in which the patient exhibits features from two or more diseases. these typically include systemic sclerosis, dermatomyositis, polymyositis, rheumatoid arthritis, systemic lupus erythematosus, and sjogren syndrome; in pediatrics the respective pediatric entities are encountered.

• Scleroderma Polymyositis Overlap Syndrome|Scleroderma Polymyositis

  a rare autoimmune disorder in which patients present with overlapping symptoms of systemic scleroderma and polymyositis or dermatomyositis.

• Onycholysis

  a nail condition characterized by spontaneous separation of a fingernail or toenail from its nail bed.

• Exosome Complex Component RRP45|AMPA RECEPTORS|Autoantigen PM/Scl 1|EXOSC9|Exosome Component 9|GLuRs|P75 Polymyositis-Scleroderma Autoantigen|P75 Polymyositis-Scleroderma Overlap Syndrome Associated Autoantigen|P75 Polymyositis-Scleroderma Overlap Syndrome-Associated Autoantigen|PM/Scl-75|Polymyositis/Scleroderma Autoantigen 1|Polymyositis/Scleroderma Autoantigen 75 kDa

  exosome complex component rrp45 (439 aa, ~49 kda) is encoded by the human exosc9 gene. this protein is involved in the regulation of the exoribonuclease activity of the exosome.

• Exosome Component 10|Autoantigen PM-SCL|Autoantigen PM/Scl|EC 3.1.13.-|EXOSC10|EXOSC10|P100 POLYMYOSITIS-SCLERODERMA AUTOANTIGEN|P100 Polymyositis-Scleroderma Overlap Syndrome-Associated Autoantigen|PM/Scl 2|PM/Scl-100|PM/Scl-100|Polymyositis/Scleroderma Autoantigen 100 kDa|Polymyositis/Scleroderma Autoantigen 2|Polymyositis/Scleroderma Autoantigen 2

  exosome component 10 (885 aa, ~101 kda) is encoded by the human exosc10 gene. this protein plays a role in the maturation and degradation of rna.

• Nail Loss, PRO-CTCAE|Nail loss|Onycholysis, PRO-CTCAE|PRO-CTCAE, Nail Loss

  onycholysis as recorded on the pro-ctcae questionnaire.

Skin Conditions

Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:

The full article covers:

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