2026 ICD-10-CM Diagnosis Code L85.8Other specified epidermal thickening
ICD-10-CM Codes›L00–L99›L80-L99›L85
- Billable — Valid for Submission
- Not Chronic
L85.8 is a billable ICD-10-CM diagnosis code for other specified epidermal thickening. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 606 through 607. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified skin disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acquired keratosis follicularis
- Acquired keratosis pilaris
- Arsenical keratosis
- Chronic eczema of foot
- Cutaneous horn
- Eruptive keratoacanthoma
- Focal acral hyperkeratosis
- Giant keratoacanthoma
- Heat-induced dermatosis
- Hereditary keratoacanthoma
- Hyperkeratotic eczema of soles
- Hypotrichosis with keratosis pilaris
- Inflammatory hyperkeratotic dermatosis
- Keratoacanthoma
- Keratoacanthoma of eyelid
- Keratoacanthoma of skin
- Keratoacanthoma of skin of wrist
- Keratosis pilaris
- Malignant neoplasm of nail apparatus
- Malignant neoplasm of soft tissue of wrist
- Multiple keratoacanthoma of skin
- Multiple minute digitate hyperkeratosis of Goldstein
- Neoplasm of skin of wrist
- Pseudoepitheliomatous hyperplasia
- Retention hyperkeratosis
- Smokers keratosis
- Solitary keratoacanthoma
- Squamous cell carcinoma of eyelid
- Squamous cell carcinoma of nail apparatus
- Squamous cell carcinoma of upper extremity
- Subungual keratoacanthoma
- Tar keratosis
- Thermal keratosis
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Cutaneous horn
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- Cornu cutaneum - L85.8
- Dyskeratosis - L85.8
- Keratoacanthoma - L85.8
- arsenical - L85.8
- pilaris, acquired - L85.8
- specified NEC - L85.8
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Cornu cutaneum
- Dyskeratosis
- Horn
- cutaneous
- Keratoacanthoma
- Keratosis
- arsenical
- Keratosis
- pilaris, acquired
- Lichen
- pilaris
- acquired
- Thickening
- epidermal
- specified NEC
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Keratoacanthoma
a benign, non-neoplastic, usually self-limiting epithelial lesion closely resembling squamous cell carcinoma clinically and histopathologically. it occurs in solitary, multiple, and eruptive forms. the solitary and multiple forms occur on sunlight exposed areas and are identical histologically; they affect primarily white males. the eruptive form usually involves both sexes and appears as a generalized papular eruption.Conjunctival Keratoacanthoma
a rapidly growing neoplasm that arises from the conjunctiva. it is characterized by a proliferation of squamous cells, acanthosis, keratinization, dysplasia, increased mitotic activity, and a central crater filled with keratinocytes. it is considered a variant of well-differentiated squamous cell carcinoma with distinct clinical behavior.Experimental Organism Benign Keratoacanthoma|KERATOACANTHOMA, BENIGN
a benign neoplasm in the superficial dermis with direct association to the epidermis, composed of well differentiated squamous epithelium and a central cavity filled with concentric layers of keratin; a pore (opening in the epidermis) may be present. (cdisc)Grade 2 Keratoacanthoma, CTCAE
presentKeratoacanthoma
a dome-shaped, rapidly growing neoplasm composed of well differentiated squamous cells. it almost always affects the skin and usually occurs on sun-exposed areas of the body, most often the head, neck, and limbs. rare cases have been reported in extracutaneous sites including the conjunctiva, subungual space, and vulva. it is considered a variant of well-differentiated squamous cell carcinoma with distinct clinical behavior.Keratoacanthoma, CTCAE
a disorder characterized by a cutaneous tumor that most commonly presents a dome-shaped nodule with a central keratin-filled crater.Skin Keratoacanthoma|Cutaneous Keratoacanthoma|keratoacanthoma
a dome-shaped, rapidly growing skin neoplasm composed of well differentiated squamous cells. it usually occurs on sun-exposed areas of the body, most often the head, neck, and limbs. it is considered a variant of well-differentiated squamous cell carcinoma with distinct clinical behavior. keratoacanthomas affect males more frequently than females and the majority tend to regress spontaneously.Vulvar Keratoacanthoma
a keratoacanthoma that arises from the vulva. it grows rapidly and may regress spontaneously. it is considered a variant of well-differentiated squamous cell carcinoma with distinct clinical behavior.Vulvar Squamous Cell Carcinoma, Keratoacanthoma Type|Vulvar Keratoacanthoma-Like Carcinoma
a rapidly growing squamous cell carcinoma that arises from the vulva. it is self-limited and is characterized by the presence of a central crater that contains squamous cells. the proliferating squamous cells infiltrate the dermis below and produce keratin masses that are pushed towards the surface of the tumor.Conjunctival Pseudoepitheliomatous Hyperplasia
a reactive proliferation of the conjunctival squamous epithelium not associated with glandular elements.Pseudoepitheliomatous Hyperplasia
a benign lesion characterized by epidermal and adnexal epithelial hyperplasia. it is caused by chronic inflammation and infection. it may be associated with cutaneous neoplasms as well.Subungual Keratoacanthoma
a rapidly growing, painful tumor that arises from the nail bed and is characterized by the proliferation of squamous cells, with histological features indistinguishable from squamous cell carcinoma.
Patient EducationClinical
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:
- What does your skin do?
- What problems and conditions can affect your skin?
- How can I keep my skin healthy?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert L85.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About L85.8Overview
Is L85.8 (Other epidermal thickening) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified epidermal thickening on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does L85.8 group to?
When other specified epidermal thickening is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of L85.8?
Under the General Equivalence Mappings, other specified epidermal thickening converts to ICD-9-CM 701.8 (skin hypertro/atroph NEC). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
