S00.249D External constriction of unspecified eyelid and periocular area, subsequent encounter

ICD-10-CM S00.249D: External constriction of unspecified eyelid and periocular area, subsequent encounter

ICD-10-CM code S00.249D designates a subsequent encounter for external constriction of an unspecified eyelid and periocular area. The available sources list this diagnosis code alongside related eye and head injury classifications. They also place this code within Medicare billing and coding guidance contexts, though they do not establish specific clinical coverage rules. 1 2 3

Plain-language overview

Code S00.249D describes a diagnosis of external constriction affecting an unspecified eyelid and the surrounding periocular area during a subsequent encounter. 3

What this code represents

The seventh character D in S00.249D specifies that this diagnosis applies to a subsequent encounter, distinguishing it from the initial encounter and sequela codes. 3

Coding details

The code S00.249D is listed in the ICD-10-CM code tree alongside S00.249A for initial encounters and S00.249S for sequela of the same unspecified eyelid condition. 3

The code S00.249D differs from S00.241D, which specifically denotes external constriction of the right eyelid and periocular area during a subsequent encounter. 2

Documentation considerations

The cited excerpts list S00.249D and related external constriction codes but do not establish specific clinical documentation elements required to support the use of this diagnosis. 1 2 3

Coverage and utilization context

The Centers for Medicare and Medicaid Services includes external constriction of the eyelid and periocular area diagnoses within billing and coding articles for services such as ocular photography and debridement. 1 2

The inclusion of S00.249D in Medicare billing and coding articles provides operational context, but the cited excerpts do not confirm that this diagnosis guarantees payer coverage for any specific service. 1 2

What the sources add

The Unbound Medicine source outlines the ICD-10-CM code tree structure, while the CMS sources place the related right eyelid constriction codes within official Medicare billing guidance. 1 2 3

Questions to verify

The cited excerpts list S00.249D and related codes but do not provide coding instructions directing reviewers to verify laterality or encounter type in the clinical documentation. 1 2 3

Sources

1. Article - Billing and Coding: Ocular Photography - External (A57068) — cms.gov; accessed 2026-07-25.
2. Article - Billing and Coding: Debridement Services (A56459) — cms.gov; accessed 2026-07-25.
3. ICD-10-CM 2024 | S09 - Other and unspecified injuries of head — unboundmedicine.com; accessed 2026-07-25.