S80.912A Unspecified superficial injury of left knee, initial encounter

ICD-10-CM S80.912A: Unspecified superficial injury of left knee, initial encounter

ICD-10-CM code S80.912A designates an unspecified superficial injury of the left knee for an initial encounter. The available sources establish this code within the S00-T88 chapter and distinguish it from subsequent encounters or sequelae. Documentation for this trauma-focused diagnosis links to objective findings, time course, and the plan of care. 2 3

Plain-language overview

Code S80.912A identifies an unspecified superficial injury of the left knee during an initial encounter, providing a diagnosis for trauma-focused clinical management rather than detailing a specific type of superficial injury. 2

What this code represents

The S80.912A diagnosis is situated within the S00-T88 chapter of the ICD-10-CM coding system and is explicitly documented for an initial encounter for care. 2

Coding details

The code S80.912A for an unspecified superficial injury of the left knee is distinct from S80.912D, which represents a subsequent encounter, and S80.912S, which denotes a sequela of the injury. 3

Left knee injury codes in the S80 and S83 categories differentiate superficial injuries from specific internal derangements, such as S83.207A for an unspecified tear of the meniscus. 3

Documentation considerations

Clinical documentation for S80.912A links the diagnosis to objective findings, the time course of the injury, and the planned care, supporting decision continuity from triage through discharge. 2

The diagnostic workup for an S80.912A injury is proportionate to the injury mechanism and exam findings, considering high-risk alternatives like occult fracture, vascular compromise, or nerve injury. 2

What the sources add

While S2 identifies external injury forces as an etiology for the superficial trauma classified by S80.912A, S1 describes specific knee injury mechanisms like a direct hit to the lateral knee or non-contact pivoting. 1 2

The Carepatron source provides a structured list of left knee diagnosis codes, whereas the Sprypt source provides clinical management and documentation guidance specifically for the S80.912A code. 2 3

Clinical context

Clinical presentation for an S80.912A diagnosis involves focal tenderness, the trajectory of swelling, and neurologic status, with prognosis influenced by injury severity, comorbidities, and treatment timeliness. 2

Sources

1. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Unspecified Superficial Injury Of Left Knee, Initial Encounter | ICD-10-CM S80.912A Clinical Guide — sprypt.com; accessed 2026-07-25.
3. Left Knee Injury ICD-10-CM Codes — carepatron.com; accessed 2026-07-25.