ICD10BillableValid for clinical use
ICD-10 Code L85.9: Epidermal thickening, unspecified
Reviewed by HealthAssure Clinical TeamUpdated 26 May 2026
What is this code?
ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the skin and subcutaneous tissue (L00-L99).
When is it used?
- May be used when a clinician documents epidermal thickening, unspecified in a patient's medical record.
- May appear in hospital records, claims, referrals, and clinical documentation.
- This code can be used as a clinically usable diagnosis entry in standardized coding workflows.
What it does not mean
- A code alone does not explain severity, treatment plan, or outcome.
- A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
Code hierarchy
chapter
12Diseases of the skin and subcutaneous tissue (L00-L99)
block
L80-L99Other disorders of the skin and subcutaneous tissue
category
L85Other epidermal thickening
currentL85
Where you may see this code
You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.
Related specialists
Dermatologist
Related codes
Sibling codes
Mapped diagnoses and classifications
SNOMED_CT 1254883007high
Callus of hindfoot
Source: SNOMED International ICD-10 map
SNOMED_CT 75307004high
Epithelial hyperplasia of skin
Source: SNOMED International ICD-10 map
SNOMED_CT 416295006high
Focal epithelial hyperplasia of skin
Source: SNOMED International ICD-10 map
SNOMED_CT 1386304001high
Hyperkeratosis due to lymphedema
Source: SNOMED International ICD-10 map
SNOMED_CT 402343006high
Retention hyperkeratosis
Source: SNOMED International ICD-10 map
SNOMED_CT 10165000high
Subungual hyperkeratosis
Source: SNOMED International ICD-10 map
Coding guidelines
Compatibility
Legacy and official ICD code match exactly.
Legacy codes
L85.9
Common synonyms
Epidermal thickening, unspecifiedEpidermal thickening
Frequently asked questions
About this content
This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.