L27.9 Dermatitis due to unspecified substance taken internally
The ICD-10-CM code for Dermatitis due to unspecified substance taken internally is L27.9 (FY2026). It is a billable, claim-ready diagnosis code.
Classification
- Section
- L20-L30: Dermatitis and eczema (L20-L30)
- Category L27
- 6 codes (5 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to L27.9:
- Dermatitis (eczematous) › due to › ingestion, ingested substance
- Dermatitis (eczematous) › due to › internal agent
U.S. Hospital Utilization
L27.9 appeared in too few sampled U.S. inpatient stays in 2022 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Official Coding Guidelines
Pressure ulcer stages—L89 identifies site/stage; code all ulcersa. Pressure ulcer stage codes 1) Pressure ulcer stages Codes in category L89, Pressure ulcer, identify the site and stage of the pressure ulcer. The ICD-10-CM classifies pressure ulcer stages based on severity, which is designated by stages 1-4, deep tissue pressure injury, unspecified stage, and unstageable. Assign as many codes from category L89 as needed to identify all the pressure ulcers the patient has, if applicable. See Section I.B.14. for pressure ulcer stage documentation by clinicians other than patient's provider.
Unstageable pressure ulcers—L89.--0 based on clinical documentation2) Unstageable pressure ulcers Assignment of the code for unstageable pressure ulcer (L89.--0) should be based on the clinical documentation. These codes are used for
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026