Skin conditions are quite common in the United States, affecting roughly one in three Americans at any given time. As of early 2026, data from the American Academy of Dermatology (AAD) and recent clinical reports highlight that while acne is the most prevalent condition overall, contact dermatitis remains the primary skin-related reason Americans visit a family physician. Actinic keratosis (precancerous sun spots) is reportedly evolving into one of the top diagnoses for dermatologist office visits.
While dermatology practices manage a wide spectrum of conditions, it’s essential to document them using accurate ICD-10 skin disorder codes. Knowing how to code common skin conditions in ICD-10 helps ensure proper documentation, supports medical necessity, and improves revenue cycle performance. That’s where professional dermatology medical billing and coding services come in. Physicians are increasingly relying on this expert support to ensure precise coding, proper reimbursement, regulatory compliance, and smooth revenue cycle operations.
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Below is a comprehensive list of ICD-10 codes for common dermatologic conditions and an overview of ICD-10 documentation requirements for dermatology.
ICD-10 Codes for 8 Common Dermatologic Conditions
Here is an overview of common skin conditions frequently reported in physician practices and dermatology settings along with their ICD-10 codes:
- Acne: According to the ADA, acne affects up to 50 million Americans annually. Although this skin condition commonly begins during puberty and affects many adolescents and young adults, it can develop at any age and may persist into the 30s and 40s. In fact, adult acne is increasingly common and affects up to 15% of women.
Acne presents in several forms—including blackheads, whiteheads, inflammatory pimples, cysts, and nodules. A board-certified dermatologist can identify the specific type of acne and recommend therapy tailored to the patient’s skin type and the severity of the condition. Acne ICD-10 codes include:- L70.0 Acne vulgaris
- L70.9 Acne, unspecified
- Eczema: Also known as Atopic Dermatitis (AD), this chronic skin disorder is characterized by dry, itchy skin and red rashes. Though more common among children, eczema can affect people of any age. The rashes commonly appear on the face, cheeks, scalp, arms and legs, but can also occur on the wrists, ankles, eyelids, front side of the neck and bend side of the elbows and knees. The ICD-10 codes for eczema are:
- L20 – Atopic dermatitis
- L20.0 – Besnier’s prurigo
- L20.8 – Other atopic dermatitis
- L20.81 – Atopic neurodermatitis
- L20.82 – Flexural eczema
- L20.83 – Infantile (acute) (chronic) eczema
- L20.84 – Intrinsic (allergic) eczema
- L20.89 – Other atopic dermatitis
- L20.9 – Atopic dermatitis, unspecified
- L20 – Atopic dermatitis
- L23.9 – Allergic contact dermatitis, unspecified cause
- L24.9 – Irritant contact dermatitis, unspecified cause
- L30.9 – Dermatitis, unspecified
- Psoriasis: This chronic autoimmune condition causing rapid skin cell buildup, resulting in itchy, scaly, and inflamed silvery-white plaques which may burn or sting. The plaques typically appear on the scalp, elbows, and knees. The condition is triggered by stress, injuries to the skin, certain infections, and medications. Treatment modalities include systemic medications (methotrexate, cyclosporine, biologics, and retinoids), topical therapies (like corticosteroids, synthetic vitamin D analogues, salicylic acid, and moisturizer) and light therapy.
There are different types of psoriasis and the ICD-10 code classification is based on the specific type and clinical presentation. The primary ICD-10 code for psoriasis is L40. The sub-codes are:
- L40.0 Psoriasis vulgaris – Includes nummular and plaque psoriasis. The most common form.
- L40.1 Generalized pustular psoriasis – Includes Von Zumbusch disease
- L40.2 Acrodermatitis continua – Pustular eruptions typically on fingertips/toes
- L40.3 Pustulosis palmaris et plantaris – Psoriasis localized to the palms and soles
- L40.4 Guttate psoriasis – Small, drop-like lesions, often triggered by infection
- L40.5 Arthropathic psoriasis – Psoriatic arthritis (requires a 5th digit for specifics)
- L40.8 Other psoriasis – Includes erythrodermic psoriasis (L40.85)
- L40.9 Psoriasis, unspecified – Used when the specific type isn’t documented
- Rosacea: Rosacea is a chronic inflammatory skin condition that causes facial redness and visible blood vessels, typically affecting the nose and cheeks but sometimes spreading to the forehead and chin. It has four subtypes, and while the exact cause is unknown, various triggers can worsen symptoms. Common signs include persistent redness, swollen bumps, broken capillaries, enlarged pores, and thickened skin around the nose.
Rosacea most often affects fair-skinned women between ages 30 and 60. In men, it can be more severe and may lead to nasal enlargement (rhinophyma). Treatment usually includes topical medications and, in some cases, oral drugs to manage symptoms.
Rosacea is classified under category L71 in ICD-10. The relevant codes are:
- L71.0 – Perioral dermatitis
- L71.1 – Rhinophyma
- L71.8 – Other rosacea
- L71.9 – Rosacea, unspecified
- Hives: Hives, clinically referred to as Urticaria, are skin-colored welts that can appear anywhere on the body. This skin condition occurs when immune cells release histamine in response to allergies, infections, stress, or temperature changes. Hives often cause stinging or burning, which can last from hours or days to over six weeks. The condition can be managed by taking prescribed medications and antihistamines to reduce itching and swelling, avoiding triggers, and skin care.
Most ICD-10 codes for hives fall under the L50 category:
- L50.0 Allergic urticarial – Hives caused by food, drug, or inhalant allergies
- L50.1 Idiopathic urticaria Hives with no known cause (often used for chronic spontaneous hives)
- L50.2 Urticaria due to cold and heat Triggered by temperature changes
- L50.3 Dermatographic urticaria Hives caused by pressure or “skin writing”
- L50.5 Cholinergic urticaria Triggered by sweat, heat, or exercise
- L50.6 Contact urticaria Triggered by something touching the skin (e.g., latex, plants)
- L50.8 Other urticaria Includes Chronic urticaria and recurrent periodic hives
- L50.9 Urticaria, unspecified Used when the type or cause is not documented
Acute urticaria symptoms are also frequent in anaphylaxis, a life-threatening reaction that requires immediate diagnosis and treatment. If the hives are part of a severe anaphylactic reaction, ICD-10 codes T78.0- and T78.2- should be prioritized, with the specific urticaria code listed as a secondary diagnosis
- Alopecia (Hair Loss): Also known as androgenetic alopecia, hair loss caused by hereditary thinning or baldness affects about 80 million Americans. Many conditions, diseases, and improper care can also result in hair loss. Abnormally heavy hair loss requires diagnosis and treatment by a dermatologist.
Alopecia is classified under category L63–L65 in ICD-10, depending on the type and cause. For example:
- L63 Alopecia Areata
- L63.0 Alopecia (capitis) totalis
- L63.1 Alopecia universalis
- L63.2 Ophiasis
- L63.8 Other alopecia areata
- L63.9 Alopecia areata, unspecified
Androgenic Alopecia
- L64.9 Androgenic alopecia, unspecified
- L65 Other Nonscarring Hair Loss
- L65.9 Nonscarring hair loss, unspecified
- Fungal Infections (Dermatophytosis): Dermatophytosis (ringworm or tinea) is a common, highly contagious superficial fungal infection affecting the skin, hair, and nails, caused by several different fungi that feed on keratin. Symptoms include rashes, scaling, and itching. The infection can be effectively treated with antifungal medications applied directly to the affected areas or taken orally.
The primary ICD-10 codes for dermatophytosis (B35) are:- B35.0 Tinea barbae / Tinea capitis – Beard and scalp (beard specifically).
- B35.1 Tinea unguium – Finger or toe nails (Onychomycosis).
- B35.2 Tinea manuum – Hand.
- B35.3 Tinea pedis – Foot (Athlete’s foot)
- B35.4 Tinea corporis – Body (Classic ringworm).
- B35.5 Tinea imbricate – Scaly, concentric rings (Tokelau).
- B35.6 Tinea cruris -Groin (Jock itch).
- B35.8 Other dermatophytoses – Disseminated or granulomatous types.
- B35.9 Dermatophytosis, unspecified – Site not documented.
- B36.0 Pityriasis versicolor.
- Viral Skin Infections: Viral skin infections are common, contagious skin conditions caused by viruses like HPV, herpes simplex, and varicella-zoster (shingles/chickenpox). They manifest as rashes, warts, blisters, or lesions. Accurate diagnosis is crucial for effective management, especially in immunocompromised patients.
ICD-10 codes for viral skin infections appear in categories B00–B08 (viral infections characterized by skin and mucous membrane lesions).
Herpes Simplex Virus (HSV)- B00.0 Eczema herpeticum
- B00.1 Herpesviral vesicular dermatitis
- B00.2 Herpesviral gingivostomatitis and pharyngotonsillitis
- B00.9 Herpesviral infection, unspecified
Herpes Zoster (Shingles)
- B02.9 Zoster without complications
(There are more specific B02 codes for complications such as neuralgia)
Warts (Human Papillomavirus – HPV)
- B07.0 Plantar wart
- B07.8 Other viral warts
- B07.9 Viral wart, unspecified
Molluscum Contagiosum
- B08.1 Molluscum contagiosum
Other Viral Skin Infections
- B08.4 Enteroviral vesicular stomatitis with exanthem (Hand, foot, and mouth disease)
- B08.8 Other specified viral infections characterized by skin and mucous membrane lesions
- B08.9 Unspecified viral infection characterized by skin and mucous membrane lesions
Accurate reporting of skin condition diagnosis codes depends heavily on precise and comprehensive documentation of the specific skin disorder type, location, laterality, severity, and stage.
Medical codes for other types of dermatitis:
Documentation Tips for Reporting Common Skin Conditions
When documenting skin disorders, dermatologists should adopt a precise, systematic approach detailing the lesion’s nature, location, and evolution, along with symptoms like itch or pain. This includes using standard dermatological terminology, documenting the distribution and configuration of lesions, and recording treatment history. Guidelines from the American Academy of Dermatology (AAD) and Centers for Medicare & Medicaid Services (CMS) highlight the following:
- Key Clinical Findings
- Location and Distribution: Specify exactly where the lesion is and its pattern (e.g., symmetrical, dermatomal, or sun-exposed areas).
- Morphology: Use precise terms such as macule (flat), papule (raised), vesicle (fluid-filled), or wheal (hives).
- Measurements: Record the size (length x width) in centimeters or millimeters. For surgical procedures, measure the lesion plus margins prior to excision.
- Color and Texture: Note changes like hyperpigmentation, scaling, or induration
- Comprehensive Patient History
A thorough history provides context that can differentiate similar-looking disorders. - Diagnostic Evidence
To establish a medically determinable impairment, findings must be from an acceptable medical source. Results from skin biopsies, allergy testing, or relevant laboratory reports should be included. Providing both zoomed-in and zoomed-out photos ensure context and support tracking changes over time. - Specialized Guidelines by Disorder
Specific conditions may have additional documentation burdens. For example, atopic dermatitis requires documenting associated comorbidities like mental health issues or sleep disturbances. For psoriasis, the record should include severity measures and previous responses to systemic or topical therapies. - Coding and Billing Compliance
- Ensure ICD-10 specificity by avoiding unspecified codes when possible. For example, use R23.4 for texture changes like scaling and R23.8 for other specific changes like hyperpigmentation.
- Follow CPT coding guidelines for skin disorders. Prior to excision, measure the lesion must be made for accurate billing. Clearly distinguish between a tangential biopsy (CPT 11102-11103) and a shave removal (CPT 11300-11313) based on the primary intent.
- Note associated conditions like mental health impacts, bone health (for atopic dermatitis), or metabolic syndrome.
AI + Human Review for Accurate Skin Disorder Coding
Accurate skin condition coding is extremely challenging because various conditions often look similar. For e.g., scalp psoriasis and seborrheic dermatitis present with similar symptoms but require vastly different ICD-10 codes.
In the complex world of dermatology coding, AI with a Human-in-the-Loop (HITL) model balances high-speed data processing with the nuanced judgment of a medical coder. Here’s a brief overview of how this approach can ensure accurate ICD-10 codes for common skin conditions:
- AI analyzes both clinical notes and dermatoscopic images to suggest the most specific code.
- AI automatically extracts anatomical locations, reducing manual efforts on searching through the Electronic Health Record (EHR) for site details.
- The software checks for unbundling errors and flags missing modifiers.
The human coder acts as the final auditor, reviewing and verifying the codes before they are submitted, minimizing denials and maximizing reimbursement. The best part is that AI-assisted medical coding services learn and get smarter with every human correction.
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