L66.3 Perifolliculitis capitis abscedens

ICD-10-CM Diagnosis Code L66.3: Perifolliculitis capitis abscedens

ICD-10-CM code L66.3 represents Perifolliculitis capitis abscedens, a condition classified as a disease or syndrome. The code is active for the 2026 version and falls under the parent category of cicatricial alopecia, which refers to scarring hair loss. This terminology record also notes narrower concepts. 1

Plain-language overview

ICD-10-CM code L66.3 identifies a specific medical condition named Perifolliculitis capitis abscedens, which is classified under the semantic type of disease or syndrome. 1

What this code represents

Code L66.3 represents a diagnosis of Perifolliculitis capitis abscedens and is nested within the L66 parent concept for cicatricial alopecia, meaning scarring hair loss. 1

Coding details

The terminology record for L66.3 is active for the 2026 ICD-10-CM version and indicates that this specific code possesses narrower concepts within the official terminology hierarchy. 1

Documentation considerations

The official terminology record for L66.3 establishes the exact preferred name as Perifolliculitis capitis abscedens, providing a standardized label for clinical reference. 1

What the sources add

While one source provides the official terminology record for L66.3, another source maps the same condition to the SNOMED CT code 201182003, showing cross-system alignment for this disorder. 1 3

The official terminology record assigns the preferred name Perifolliculitis capitis abscedens to L66.3, whereas a separate rare disease resource utilizes the longer name Perifolliculitis capitis abscedens et suffodiens. 1 2

Clinical context

A public health information resource refers to this condition by an expanded name, Perifolliculitis capitis abscedens et suffodiens, and asks when symptoms of this disease begin. 2

Coverage and utilization context

A clinical reference platform lists L66.3 for Perifolliculitis capitis abscedens within an ICD-10-CM interface, indicating its availability for lookup across web and mobile applications. 4

Questions to verify

Because the rare disease source asks when symptoms begin, a question to verify is whether the available documentation specifies the age of onset for Perifolliculitis capitis abscedens. 2

Sources

1. ICD-10-CM L66.3 terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. Perifolliculitis capitis abscedens et suffodiens — rarediseases.info.nih.gov; accessed 2026-07-27.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-27.
4. L66.3 - Perifolliculitis capitis abscedens | ICD-10-CM — unboundmedicine.com; accessed 2026-07-27.