S61.402S Unspecified open wound of left hand, sequela

ICD-10-CM S61.402S: Unspecified open wound of left hand, sequela

ICD-10-CM code S61.402S is identified as the unspecified open wound of the left hand, sequela. Public source materials place this diagnosis within the S61 category for open wounds of the wrist, hand, and fingers, and note its appearance in Medicare billing and coding documentation. The available excerpts do not provide specific clinical guidelines for this exact diagnosis. 4 5

Plain-language overview

The diagnosis code S61.402S is labeled as the unspecified open wound of left hand, sequela. This code appears within an ICD-10-CM code tree that organizes open wounds of the wrist, hand, and fingers. 4 5

What this code represents

The code S61.402S is listed alongside other left hand variations including S61.402A for initial encounters and S61.402D for subsequent encounters. The provided sources display these variations but do not define the specific clinical criteria for the sequela encounter. 5

Coding details

The S61.402S diagnosis is presented in a Medicare billing and coding article concerning wound and ulcer care. The article lists the code exactly as S61.402S, Unspecified open wound of left hand, sequela. 4

Within the ICD-10-CM code tree, S61.402S is grouped under S61.402 for an unspecified open wound of the left hand. The sources display this specific code structure but do not provide further coding instructions. 5

Documentation considerations

Clinical literature emphasizes examining open wounds for foreign bodies, tendon injury, arterial injury, and open fractures. However, the provided excerpts do not link these general wound evaluation practices directly to the documentation requirements for code S61.402S. 1

What the sources add

The Unbound Medicine source establishes the hierarchical placement of S61.402S among other hand and wrist open wound codes, while the CMS source demonstrates the code's exact label within an administrative billing article. 4 5

Clinical context

Clinical safety guidelines indicate that bacteria on the hands of healthcare workers can cause wound infections if present in an operative field. The provided excerpts do not explicitly connect this hand hygiene principle to the care of an S61.402S sequela. 3

Coverage and utilization context

The appearance of S61.402S in a Medicare billing and coding article establishes its existence within administrative utilization contexts. The provided excerpt does not explicitly state that this inclusion implies guaranteed coverage. 4

Sources

1. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Bookshelf — ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Clinical Safety: Hand Hygiene for Healthcare Workers — cdc.gov; accessed 2026-07-25.
4. Article - Billing and Coding: Wound and Ulcer Care (A58565) — cms.gov; accessed 2026-07-25.
5. ICD-10-CM 2024 | S61 - Open wound of wrist, hand and fingers — unboundmedicine.com; accessed 2026-07-25.