ICD-10 Code L87.1 – Reactive perforating collagenosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code L87.1 – Reactive perforating collagenosis
What it is
L87.1 identifies reactive perforating collagenosis, a skin disorder in which altered collagen is eliminated through the epidermis. Use it when the diagnosis is documented and you need the specific ICD-10-CM code.
Clinical signs
Typical findings include firm, often itchy papules or nodules with a central crust or keratotic plug. Lesions may show transepidermal elimination of collagen; clinical features vary, so refer to documentation.
When to use this code
Use L87.1 when the provider clearly documents reactive perforating collagenosis, including acquired or hereditary forms if that is the stated diagnosis. Apply it for outpatient, inpatient, or claim coding when the skin condition is the reason for care or is clinically relevant.
If the note only describes a nonspecific perforating dermatosis, check documentation before coding this more specific diagnosis. You should code the documented condition, not infer collagenosis from a rash description alone.
Do not use for
Do not use this code for other perforating disorders, such as elastosis perforans serpiginosa or perforating folliculitis, unless specifically documented. Check documentation if the diagnosis is uncertain.
Coding tip
Look for the exact phrase “reactive perforating collagenosis” in the assessment or pathology report before assigning L87.1.