ICD-10-CM 2027
ICD-10 code for Hyperkeratosis
From the official ICD-10-CM alphabetic index entry “Hyperkeratosis”. Page updated September 29, 2026.
About coding Hyperkeratosis
The ICD-10-CM code for Hyperkeratosis is L85.9 (Epidermal thickening, unspecified). The official index lists 10 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on L85.9.
Within L85, choose L85.9 (Epidermal thickening, unspecified) only when documentation doesn't support a more specific option: acquired ichthyosis (L85.0), acquired keratosis [keratoderma] palmaris et plantaris (L85.1), keratosis punctata (palmaris et plantaris) (L85.2), xerosis cutis (L85.3) and other specified epidermal thickening (L85.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific Hyperkeratosis codes (official index)
- cervix N88.0 — Leukoplakia of cervix uteri
- due to yaws (early) (late) (palmar or plantar) A66.3 — Hyperkeratosis of yaws
- follicularis Q82.8 — Other specified congenital malformations of skin
- penetrans (in cutem) L87.0 — Keratosis follicularis et parafollicularis in cutem penetrans
- palmoplantaris climacterica L85.1 — Acquired keratosis [keratoderma] palmaris et plantaris
- pinta A67.1 — Intermediate lesions of pinta
- senile (with pruritus) L57.0 — Actinic keratosis
- universalis congenita Q80.8 — Other congenital ichthyosis
- vocal cord J38.3 — Other diseases of vocal cords
- vulva N90.4 — Leukoplakia of vulva
Common questions about Hyperkeratosis ICD-10 codes
What is the ICD-10 code for Hyperkeratosis?
- L85.9 — Epidermal thickening, unspecified. More specific codes apply when the documentation supports them: N88.0, A66.3, Q82.8, L87.0 and others below.
What is the ICD-10 code for cervix hyperkeratosis?
- N88.0 — Leukoplakia of cervix uteri.
What is the ICD-10 code for follicularis hyperkeratosis?
- Q82.8 — Other specified congenital malformations of skin.
What is the ICD-10 code for palmoplantaris climacterica hyperkeratosis?
- L85.1 — Acquired keratosis [keratoderma] palmaris et plantaris.
What is the ICD-10 code for pinta hyperkeratosis?
- A67.1 — Intermediate lesions of pinta.
What is the ICD-10 code for senile hyperkeratosis?
- L57.0 — Actinic keratosis.
What is the ICD-10 code for universalis congenita hyperkeratosis?
- Q80.8 — Other congenital ichthyosis.
Is L85.9 billable?
- Yes. L85.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can L85.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict L85.9 as a principal diagnosis.
Is L85.9 a CC or MCC?
- No. L85.9 is neither a CC nor an MCC under MS-DRG v44.0.