L24.9 Irritant contact dermatitis, unspecified cause

Billable ICD-10-CM code, FY2026.

Applicable to

• Irritant contact eczema NOS

Applies from L24 Irritant contact dermatitis

Excludes1 (never code together)

• allergy NOS (T78.40)
• contact dermatitis NOS (L25.9)
• dermatitis NOS (L30.9)

Excludes2 (not included here)

• allergic contact dermatitis (L23.-)
• dermatitis due to substances taken internally (L27.-)
• dermatitis of eyelid (H01.1-)
• diaper dermatitis (L22)
• eczema of external ear (H60.5-)
• perioral dermatitis (L71.0)
• radiation-related disorders of the skin and subcutaneous tissue (L55-L59)

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 692.9 Contact dermatitis and other eczema, unspecified cause (approximate)

Code annotations containing back-references to L24.9

Back-references to L24

• Code First: F54 Psychological and behavioral factors associated with disorders or diseases classified elsewhere ("dermatitis (L23-L25)")
• Type 2 Excludes: L23 Allergic contact dermatitis ("irritant contact dermatitis (L24.-)")
• Type 1 Excludes: L25 Unspecified contact dermatitis ("irritant contact dermatitis (L24.-)")
• Type 2 Excludes: L27 Dermatitis due to substances taken internally ("contact dermatitis (L23-L25)")
• Type 2 Excludes: L30 Other and unspecified dermatitis ("contact dermatitis (L23-L25)")
• Type 1 Excludes: L53 Other erythematous conditions ("erythema due to external agents in contact with skin (L23-L25)")
• Type 1 Excludes: T78.4 Other and unspecified allergy ("dermatitis (L23-L25, L27.-)")

Diagnosis Index entries for L24.9

• Dermatitis (eczematous) › contact (occupational) › irritant
• Dermatitis (eczematous) › due to › external irritant NEC

Nearby codes

• L24.6 Irritant contact dermatitis due to food in contact with skin
• L24.7 Irritant contact dermatitis due to plants, except food
• L24.8 Irritant contact dermatitis due to other agents
• L24.81 Irritant contact dermatitis due to metals
• L24.89 Irritant contact dermatitis due to other agents
• L24.9 Irritant contact dermatitis, unspecified cause (this code)
• L24.A Irritant contact dermatitis due to friction or contact with body fluids
• L24.A0 Irritant contact dermatitis due to friction or contact with body fluids, unspecified
• L24.A1 Irritant contact dermatitis due to saliva
• L24.A2 Irritant contact dermatitis due to fecal, urinary or dual incontinence
• L24.A9 Irritant contact dermatitis due friction or contact with other specified body fluids