S31.833 Puncture wound without foreign body of anus

ICD-10-CM S31.833: Puncture wound without foreign body of anus

ICD-10-CM code S31.833 represents a puncture wound without a foreign body of the anus. It falls under the broader category of open wounds of the anus. The code is further specified by encounter characters, such as initial, subsequent, or sequela, which are detailed in billing and coding materials. 1 2 4

Plain-language overview

Code S31.833 identifies a puncture wound of the anus where no foreign body is present. This distinguishes it from S31.834, which is used for puncture wounds of the anus that do involve a retained foreign body. 1 5

What this code represents

The base code S31.833 is categorized under S31.83, which encompasses open wounds of the anus. Other codes within this same category include S31.831 for lacerations without foreign bodies and S31.839 for unspecified open wounds. 4 5

Coding details

The S31.833 code possesses specific extensions for encounter type, including S31.833A for an initial encounter, S31.833D for a subsequent encounter, and S31.833S for a sequela. These character extensions differentiate the phase of care. 2 5

Documentation considerations

The supplied coding materials list S31.833D for a subsequent encounter and S31.833A for an initial encounter. This indicates that coding references utilize a seventh character to document the specific encounter phase for this injury. 2 3

What the sources add

The National Cancer Institute's EVS Explore portal lists S31.833 alongside related anal wound codes like S31.835 for open bites. The CMS billing articles apply this code within the context of debridement services and tetanus immunization. 1 2 3

The VSAC and Unbound Medicine code systems provide a structural hierarchy for S31.833. They establish that this specific puncture wound code is nested within the S31.83 open wound of anus grouping. 4 5

Coverage and utilization context

Centers for Medicare and Medicaid Services articles reference S31.833D and S31.833A in relation to debridement services and tetanus immunization. These references provide operational context for how the code appears in payer billing articles. 2 3

Questions to verify

The supplied excerpts do not establish the clinical definition of a puncture wound. Verifying the exact clinical criteria for this injury type requires consulting an official medical dictionary or clinical guideline. 1 4

The public source excerpts list S31.833A as the initial encounter code. They do not establish whether this specific seven-character code is designated as a billable code for institutional claims. 2 5

Sources

1. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
2. Article - Billing and Coding: Debridement Services (A56459) — cms.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Tetanus Immunization (A58873) — cms.gov; accessed 2026-07-25.
4. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.
5. ICD-10-CM 2024 | S31.83 - Open wound of anus — unboundmedicine.com; accessed 2026-07-25.