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2025 ICD-10-CM code L40

Psoriasis, a chronic inflammatory skin condition characterized by reddish, flaky, and often itchy skin patches.

Refer to the official ICD-10-CM coding guidelines for proper selection and sequencing of codes.When multiple types of psoriasis are present, code each type separately.

Modifiers may apply depending on the circumstances of service, such as the place of service or the type of procedure performed.

Medical necessity for treatment is established based on the severity of the psoriasis, its impact on the patient's quality of life (e.g., pruritus, pain, cosmetic concerns), and the potential for complications (e.g., psoriatic arthritis, secondary infections). Treatment should be individualized and based on clinical assessment and guidelines.

Diagnosis and management of psoriasis, including assessment of disease severity, selection of appropriate treatment modalities (topical therapies, phototherapy, systemic agents, biologics), monitoring for treatment response and adverse effects, and education of the patient about the disease and its management.

IMPORTANT More specific codes within the L40 range (e.g., L40.0 Psoriasis vulgaris, L40.1 Generalized pustular psoriasis, L40.5 Arthropathic psoriasis) may be used depending on the specific type and presentation of psoriasis.The code L40.9 (Psoriasis, unspecified) is used when the specific type is unknown or cannot be determined.

In simple words: Psoriasis is a skin condition that causes red, scaly, itchy patches. These patches can appear anywhere on the body and can be mild or severe.It's a long-term condition that requires ongoing treatment.

Psoriasis is a chronic, relapsing inflammatory skin disease characterized by well-demarcated, erythematous plaques covered with silvery-white scales.The pathogenesis involves accelerated keratinocyte proliferation and inflammation.Commonly affected areas include the elbows, knees, scalp, and lower back, but lesions can appear anywhere on the body.Clinical presentations vary widely, ranging from mild to severe, and may involve nail changes (pitting, discoloration), and in some cases, psoriatic arthritis.Severity is assessed clinically, and management typically involves topical therapies, phototherapy, systemic agents, and biologics, tailored to the individual patient's needs and disease severity.

Example 1: A 35-year-old female presents with erythematous plaques with silvery scales on her elbows and knees, consistent with plaque psoriasis.She reports pruritus and has a history of mild psoriasis for several years.The physician diagnoses her with psoriasis vulgaris (L40.0) and prescribes a topical corticosteroid., A 60-year-old male with a history of psoriasis presents with widespread pustular lesions, fever, and leukocytosis, consistent with generalized pustular psoriasis.He is diagnosed with generalized pustular psoriasis (L40.1) and requires hospitalization for systemic treatment., A 40-year-old female with a history of psoriasis presents with pain and swelling in her hands and feet, alongside characteristic psoriatic skin lesions.She is diagnosed with psoriatic arthritis (L40.5) and referred to a rheumatologist.

Detailed description of the skin lesions (location, size, shape, color, presence of scaling), duration of symptoms, patient history of psoriasis or family history, response to past treatments, presence of associated symptoms (e.g., joint pain, nail changes), results of any laboratory tests (e.g., complete blood count, inflammatory markers).

** Psoriasis is a heterogeneous condition with various subtypes and clinical presentations.Accurate coding requires careful clinical documentation to ensure appropriate reimbursement.

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