1. ICD-10-CM Codes
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2. L00-L99 Diseases of the skin and subcutaneous tissue
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3. L40-L45 Papulosquamous disorders
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4. L40- Psoriasis
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5. 2021 ICD-10-CM Diagnosis Code L40.9

2021 ICD-10-CM Diagnosis Code L40.9

Psoriasis, unspecified

2016 2017 2018 2019 2020 2021 Billable/Specific Code

• L40.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2021 edition of ICD-10-CM L40.9 became effective on October 1, 2020.
• This is the American ICD-10-CM version of L40.9 - other international versions of ICD-10 L40.9 may differ.

• Psoriasis

• A chronic disease of the skin marked by red patches covered with white scales.
• A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. Psoriatic lesions have a predilection for nails, scalp, genitalia, extensor surfaces, and the lumbosacral region; the pathology involves an accelerated epidermopoiesis. Psoriasis is associated with increased risk for melanoma, squamous cell carcinoma, and basal cell carcinoma.
• A common genetically determined, chronic, inflammatory skin disease characterized by rounded erythematous, dry, scaling patches. The lesions have a predilection for nails, scalp, genitalia, extensor surfaces, and the lumbosacral region. Accelerated epidermopoiesis is considered to be the fundamental pathologic feature in psoriasis.
• Common polygenetically determined, chronic, squamous dermatosis characterized by rounded erythematous, dry, scaling patches.
• Psoriasis is a skin disease that causes itchy or sore patches of thick, red skin with silvery scales. You usually get them on your elbows, knees, scalp, back, face, palms and feet, but they can show up on other parts of your body. A problem with your immune system causes psoriasis. In a process called cell turnover, skin cells that grow deep in your skin rise to the surface. Normally, this takes a month. In psoriasis, it happens in just days because your cells rise too fast. Psoriasis can last a long time, even a lifetime. Symptoms come and go. Things that make them worse include
  • infections
  • stress
  • dry skin
  • certain medicines
  psoriasis usually occurs in adults. It sometimes runs in families. Treatments include creams, medications and light therapy. nih: national institute of arthritis and musculoskeletal and skin diseases

• 595 Major skin disorders with mcc
• 596 Major skin disorders without mcc

Convert L40.9 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change

• Psoriasis L40.9

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.