S20.401A Unspecified superficial injuries of right back wall of thorax, initial encounter

ICD-10-CM Diagnosis Code S20.401A: Unspecified superficial injuries of right back wall of thorax, initial encounter

ICD-10-CM code S20.401A identifies an unspecified superficial injury of the right back wall of the thorax for an initial encounter. The terminology is active and classified under the semantic type of injury or poisoning. This code is listed alongside S20.401D in official terminology records. 1 3

Plain-language overview

Code S20.401A describes an unspecified superficial injury located on the right back wall of the thorax during an initial encounter, providing a standardized diagnostic label for this specific injury. 1

What this code represents

The terminology record assigns this concept the semantic type of Injury or Poisoning, establishing the fundamental clinical nature of S20.401A within the ICD-10-CM version 2026 system. 1

The parent concept for S20.401A is S20.401, which represents unspecified superficial injuries of the right back wall of the thorax without the specific encounter character denoting an initial visit. 1

Coding details

The S20.401A terminology record currently holds an active status and possesses narrower concepts within the ICD-10-CM hierarchy, indicating further specificity exists beneath this classification. 1

Documentation considerations

Accurate clinical documentation for S20.401A relies on the official terminology definition, which specifies the right back wall of the thorax as the injury site and the initial encounter as the context. 1

What the sources add

While the terminology record defines the code's clinical meaning, the National Health Statistics Reports place thorax injuries within a broader Torso body region category for statistical tracking and matrix categorization. 1 2

The Value Set Authority Center lists S20.401A alongside S20.401D, whereas the National Cancer Institute record provides the hierarchical relationship showing S20.401 as the direct parent concept. 1 3

Coverage and utilization context

The presence of S20.401A in official code system lists establishes its valid terminology status, but the supplied sources do not discuss payer-specific coverage policies or reimbursement guidelines for this diagnosis code. 1 3

Sources

1. ICD-10-CM S20.401A terminology record — National Cancer Institute Enterprise Vocabulary Services; accessed 2026-07-27.
2. National Health Statistics Reports — cdc.gov; accessed 2026-07-27.
3. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-27.