ICD-10 Code L81.1 – Chloasma (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L81.1 – Chloasma
What it is
Use this code for chloasma, also called melasma, a benign skin condition marked by patchy brown or gray-brown facial hyperpigmentation. It is usually described as symmetric and can involve the cheeks, forehead, upper lip, or chin.
Clinical signs
Typical findings include well-defined or irregular dark patches on sun-exposed facial skin. Clinical features vary; refer to documentation, especially when the note describes melasma pattern, distribution, or suspected triggers.
When to use this code
Assign L81.1 when the provider documents chloasma or melasma as the diagnosis. Use it for acquired facial hyperpigmentation that is specifically identified as this condition, including cases noted during dermatology or primary care visits. If the chart only says “hyperpigmentation,” check documentation before coding.
Do not use for
Do not use this code for other pigment disorders, post-inflammatory color change, or unspecified skin discoloration unless the provider clearly identifies chloasma. Check documentation when the cause or lesion type is different.
Coding tip
Code the condition exactly as documented and confirm that chloasma or melasma is named, not just facial darkening.