ICD-10 Code for Hyperkeratosis
The ICD-10-CM code for hyperkeratosis is L85.9 — Epidermal thickening, unspecified. This is the code the Alphabetic Index gives for hyperkeratosis with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
L85.9 is billable but unspecified. If the documentation names a type, site or cause, one of the more specific codes below is likely expected.
Which hyperkeratosis code should you use?
The Alphabetic Index lists 11 codes under Hyperkeratosis. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| cervix | N88.0 | Leukoplakia of cervix uteri | |
| due to yaws | A66.3 | Hyperkeratosis of yaws | |
| follicularis | Q82.8 | Other specified congenital malformations of skin | |
| palmoplantaris climacterica | L85.1 | Acquired keratosis [keratoderma] palmaris et plantaris | |
| pinta | A67.1 | Intermediate lesions of pinta | |
| senile | 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 |
Hyperkeratosis follicularis
| penetrans | L87.0 | Keratosis follicularis et parafollicularis in cutem penetrans |
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources