ICD-10-CM 2027
ICD-10 code for epithelial hyperplasia
From the official ICD-10-CM alphabetic index entry “Hyperplasia, hyperplastic › epithelial”. Page updated September 29, 2026.
About coding epithelial hyperplasia
The ICD-10-CM code for epithelial hyperplasia is L85.9 (Epidermal thickening, unspecified). The official index lists 5 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 epithelial hyperplasia codes (official index)
Common questions about epithelial hyperplasia ICD-10 codes
What is the ICD-10 code for epithelial hyperplasia?
- L85.9 — Epidermal thickening, unspecified. More specific codes apply when the documentation supports them: K13.29, N62, L85.9, K13.29 and others below.
What is the ICD-10 code for nipple epithelial hyperplasia?
- N62 — Hypertrophy of breast.
What is the ICD-10 code for skin epithelial hyperplasia?
- L85.9 — Epidermal thickening, unspecified.
What is the ICD-10 code for tongue epithelial hyperplasia?
- K13.29 — Other disturbances of oral epithelium, including tongue.
What is the ICD-10 code for vaginal wall epithelial hyperplasia?
- N89.3 — Dysplasia of vagina, unspecified.
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.