H01.112 Allergic dermatitis of right lower eyelid

ICD-10-CM Code H01.112: Allergic dermatitis of right lower eyelid

ICD-10-CM code H01.112 represents allergic dermatitis of the right lower eyelid. Allergic contact dermatitis involves a delayed type 4 hypersensitivity reaction to exogenous contact antigens. This code provides specific laterality and anatomical location for the diagnosis. The supplied sources establish the code's official label and clinical context, but do not confirm coverage or treatment details. 1 3 4

Plain-language overview

Allergic contact dermatitis is a delayed type 4 hypersensitivity reaction occurring in response to exogenous contact antigens. This distinguishes it from irritant contact dermatitis, which involves nonspecific skin damage from direct chemical injury. 1

What this code represents

ICD-10-CM code H01.112 specifically denotes allergic dermatitis of the right lower eyelid. The concept is formally mapped to the SNOMEDCT_US identifier 1362116009 within the ICD10CM 2025 system. 3

Coding details

Code H01.112 provides highly specific anatomical documentation by identifying both the right side and the lower eyelid. This level of specificity distinguishes it from broader codes for allergic dermatitis of an unspecified eye or unspecified eyelid. 2 4

Documentation considerations

Clinical documentation for allergic contact dermatitis may include pruritus, which is noted as a frequent symptom. No pathognomonic clinical signs or symptoms exist to definitively differentiate allergic contact dermatitis from irritant contact dermatitis. 1

Coverage and utilization context

The Centers for Medicare and Medicaid Services lists H01.112 within a billing and coding article for external ocular photography. The presence of this code in an administrative article does not guarantee payer coverage for any specific service. 4

What the sources add

The National Center for Biotechnology Information provides the underlying clinical definition of allergic contact dermatitis as a type 4 hypersensitivity reaction. The National Cancer Institute and CMS sources supply the formal code label and administrative billing context. 1 3 4

The ExPRSweb source maps H01.112 to a broader phecode category that includes various right eye eyelid conditions like hordeolum and abscess. The CMS source explicitly identifies H01.112 as allergic dermatitis of the right lower eyelid alongside adjacent left eyelid codes. 2 4

Clinical context

Different clinical patterns of allergic contact dermatitis include erythema multiforme, urticarial papular plaques, and pustular reactions. The condition affects a significant portion of the pediatric population based on recent data. 1

Questions to verify

The supplied sources do not establish whether H01.112 is a billable code for standard outpatient claims. Verification with the official ICD-10-CM coding guidelines is necessary to confirm its billable status. 3 4

Sources

1. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-26.
2. Phecode 371.3 · ExPRSweb — csg.sph.umich.edu; accessed 2026-07-26.
3. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-26.
4. Article - Billing and Coding: Ocular Photography - External (A57068) — cms.gov; accessed 2026-07-26.