L27.9 Dermatitis due to unspecified substance taken internally

Billable ICD-10-CM code, FY2026.

Applies from L27 Dermatitis due to substances taken internally

Excludes1 (never code together)

• allergy NOS (T78.40)

Excludes2 (not included here)

• adverse food reaction, except dermatitis (T78.0-T78.1)
• contact dermatitis (L23-L25)
• drug photoallergic response (L56.1)
• drug phototoxic response (L56.0)
• urticaria (L50.-)

MS-DRG index

Defines the logic of DRG(s) 606-607 in MDC 09.

Approximate ICD-9-CM (GEMs)

• 693.9 Dermatitis due to unspecified substance taken internally

Code annotations containing back-references to L27.9

Back-references to L27

• Type 2 Excludes: L23 Allergic contact dermatitis ("dermatitis due to substances taken internally (L27.-)")
• Type 2 Excludes: L24 Irritant contact dermatitis ("dermatitis due to substances taken internally (L27.-)")
• Type 2 Excludes: L25 Unspecified contact dermatitis ("dermatitis due to ingested substances (L27.-)")
• Type 1 Excludes: T78.4 Other and unspecified allergy ("dermatitis (L23-L25, L27.-)")

Diagnosis Index entries for L27.9

• Dermatitis (eczematous) › due to › ingestion, ingested substance
• Dermatitis (eczematous) › due to › internal agent

Nearby codes

• L27 Dermatitis due to substances taken internally
• L27.0 Generalized skin eruption due to drugs and medicaments taken internally
• L27.1 Localized skin eruption due to drugs and medicaments taken internally
• L27.2 Dermatitis due to ingested food
• L27.8 Dermatitis due to other substances taken internally
• L27.9 Dermatitis due to unspecified substance taken internally (this code)