ICD code S52.232E – Displaced oblique fracture of left ulna shaft

Key takeaways

S52.232E is a billable ICD-10-CM code, active in FY2026 and FY2027, for a displaced oblique fracture of the left ulna shaft. It applies at follow-up visits for an open type I or II fracture that is healing on schedule.

The 7th character E records three facts at once: a subsequent (aftercare) encounter, a Gustilo type I or II open fracture, and routine healing.

A or B on a follow-up visit is a common denial trigger. Correct it to D (closed) or E (open type I or II) before you resubmit.

Inside the surgeon’s 90-day global period after open repair, routine follow-up visits are reported with CPT 99024 instead of a separately paid office visit code.

Pabau, the practice management platform we build, turns each checkout invoice into a claim and flags denied claims for rework.

ICD-10 Code S52.232E: Quick reference

ICD-10 Code S52.232E is the billable code for a displaced oblique fracture of the left ulna shaft at a follow-up visit. The fracture was open, Gustilo type I or II, and is healing on schedule.

The code sits in category S52 (fracture of forearm), inside the injury chapter of ICD-10-CM. The table below gives each field a coder needs before opening the chart.

Verify current billable status against the CDC/NCHS ICD-10-CM web tool before each fiscal year, because addenda can activate or retire codes mid-cycle.

What S52.232E covers

S52.232E encodes six distinct clinical facts. Each word in the descriptor changes the code if it is wrong or missing from the medical record.

• Displaced: The fracture fragments are not in anatomical alignment. If the surgeon documents “nondisplaced,” the correct base code shifts to S52.235 (nondisplaced oblique, left ulna).
• Oblique: The fracture line runs at an angle across the shaft. Transverse fractures use S52.222, spiral fractures S52.242, and comminuted fractures S52.252.
• Shaft: The midportion of the ulna, not the proximal end (olecranon) or distal end (styloid). Fractures of the upper end code to S52.0-, and fractures of the lower end code to S52.6-.
• Left ulna: Laterality is hardcoded into the code. A right-side fracture requires S52.231E. When the record does not state the side, query the physician before coding.
• Subsequent encounter: The patient has completed active treatment and is receiving routine care while the fracture heals. The emergency visit, the surgery date, and visits where the surgeon is still managing the injury stay on an initial-encounter character.
• Open fracture type I or II: The skin was breached at the time of fracture, classified by the treating surgeon using the Gustilo-Anderson system. Type IIIA, IIIB, and IIIC fractures take F instead of E.

What the 7th character E means

The 7th character E records three clinical facts at once. If the record fails to support any one of them, E is the wrong character.

Section I.C.19.a of the ICD-10-CM Official Guidelines reserves the initial-encounter characters for active treatment. Once treatment is complete and the patient is in the healing or recovery phase, the subsequent-encounter characters take over.

A move from fracture care to a scheduled orthopedic follow-up plan is the clearest signal of that change. When the provider documents “healing well” or “progressing as expected,” E is the correct character.

All S52.232 code variants and how to pick the 7th character

The S52.232 subcategory carries 16 valid 7th characters. The grid below maps each one to its encounter type, fracture openness, and healing status, so the neighbors of S52.232E are easy to rule out.

The same 16 codes, written out in full:

S52.232E is bolded above. Its most error-prone neighbors are S52.232D (closed, routine healing) and S52.232H (open type I or II, delayed healing). Swapping E for D misstates whether the fracture was open. Swapping E for H misstates the healing status, and both errors generate denials.

S52.232E vs S52.232D: Open versus closed fracture on subsequent encounter

S52.232D applies to a closed fracture at the same site and healing status. S52.232E applies when the fracture was open, with a documented skin breach. The distinction depends entirely on the original injury record.

If the operative report or ED note documents an open wound communicating with the fracture, E is correct for every subsequent routine-healing visit. Coders who cannot locate that record should query the provider or pull the original chart before selecting D.

S52.232E vs S52.232A and S52.232B: Initial versus subsequent encounter

S52.232A (initial, closed) and S52.232B (initial, open type I or II) are correct only while the provider is actively treating the fracture. That covers the emergency visit, the surgery date, and visits where the surgeon is still managing acute complications.

Once the patient moves to scheduled follow-up and the provider’s role shifts to monitoring healing, the correct character becomes D or E for that visit. Carrying A or B forward onto a fourth post-op office visit is an encounter-type error, and payers deny it routinely.

How Gustilo classification decides the 7th character

Gustilo and Anderson published their open fracture classification in 1976, and Gustilo et al. refined it in 1984. It grades open fractures by wound size, contamination level, and soft tissue damage.

ICD-10-CM encodes the Gustilo grade directly into the 7th character. The surgeon’s documented grade therefore drives the claim as well as the treatment plan.

S52.232E is valid only for Gustilo type I and II. A type IIIA, IIIB, or IIIC fracture takes F, J, N, or R, depending on healing status. If the operative report does not state the Gustilo grade, the coder cannot assign an open fracture character, so query the physician first. Grading is the surgeon’s clinical judgment, and a coder cannot infer it from wound dimensions.

Clinical documentation requirements for S52.232E

Every element of the S52.232E descriptor must appear in the medical record. If one is missing, a payer’s auditor can deny or downcode the claim. Good revenue cycle management for orthopedic practices includes a pre-submission documentation checklist tied to the code.

• Laterality (left): The provider must document “left ulna.” If documentation says “ulna fracture” without laterality, the record is insufficient for S52.232E. Query the provider before coding.
• Fracture pattern (oblique): The treating note or radiology report must describe the fracture as oblique. “Fracture of the ulna” alone does not support oblique.
• Displacement status (displaced): Documentation or imaging must indicate the fragments are displaced. Nondisplaced changes the base code entirely.
• Anatomical location (shaft): The fracture site must be documented as the shaft or diaphysis of the ulna, not the proximal or distal end.
• Encounter type (subsequent): The visit note must describe aftercare, such as a routine follow-up, cast check, wound inspection, or physical therapy monitoring.
• Open fracture classification: The operative report or original treating note must state Gustilo type I or type II explicitly. Surgeon documentation of “open fracture” without a Gustilo grade does not support E, so query the surgeon.
• Healing status (routine): The progress note must indicate the fracture is healing on schedule. Radiology confirming callus formation or the physician noting “healing well” satisfies this element.

Attaching this checklist to the fracture follow-up appointment type lets staff flag an incomplete record before anyone builds the claim.

Associated CPT codes commonly billed with S52.232E

Fracture aftercare visits typically pair ICD-10 Code S52.232E with evaluation and management codes. A surgical procedure code appears only when a new procedure happens at that visit. The table below covers the most common CPT pairings at orthopedic follow-up.

Under the CMS global surgery rules, the surgeon’s routine visits within the 90-day global period of 25545 are part of the surgical payment. Report them with 99024 alongside S52.232E. Billing 25545 again on a routine follow-up date, with no new or revision procedure, creates a duplicate-service conflict that payers deny.

When the follow-up includes a two-view forearm X-ray, radiology reports 73090 with S52.232E as the supporting diagnosis.

Common claim denial reasons for ICD-10 Code S52.232E and how to prevent them

Fracture follow-up claims using ICD-10 Code S52.232E are denied for a predictable set of reasons, and encounter-type mismatches are the first to check. Catching them before submission is the core of denial management workflows for orthopedic practices.

Practices with high fracture follow-up volumes gain most from denial-reducing claims management software, which tracks each claim and returns denials for rework. Getting a clean claim through on first submission cuts the cost of appeals on fracture accounts.

Payer requirements for ICD-10 Code S52.232E claims

Medicare and most commercial payers apply fracture-specific edit rules to subsequent encounter claims. Good medical billing compliance practice includes reviewing these requirements before submitting S52.232E to any high-volume payer.

• Operative report on file: Keep documentation of the original procedure, such as ORIF or other open fracture management, to support a subsequent-encounter open fracture code. Not every claim is audited, but the record must be ready.
• Gustilo grade in the chart: Payers processing open fracture claims for subsequent encounters expect the Gustilo classification to be traceable in the medical record. A missing grade is an audit vulnerability even if the claim initially pays.
• Frequency alignment: Follow-up visit frequency should match the clinical timeline for the fracture type. Unusually frequent subsequent encounters for a routine healing fracture may trigger a utilization review flag.
• External cause coding: ICD-10-CM guidelines encourage an external cause code (V00-Y99) to explain how the fracture occurred. Workers’ compensation and liability payers often expect one.

Medicare pays for a subsequent-encounter fracture visit through the paired E/M code, whose RVU values are updated annually. Check current rates in the CMS Physician Fee Schedule lookup rather than relying on prior-year figures. Rates also vary by geographic practice cost index.

Nonunion and malunion: When to switch away from ICD-10 Code S52.232E

ICD-10 Code S52.232E remains correct only as long as the fracture is healing routinely. When the clinical picture changes, the 7th character must change with it. The table below shows the transition logic.

Coders cannot make the delayed healing or nonunion determination independently. The physician must document the finding explicitly. A note reading only “patient still having pain” or “X-ray taken” does not justify a switch to H or M at all. The character changes only when the physician’s own wording supports it.

Excludes notes and additional-code instructions

Before finalizing S52.232E, review the instructional notes at the S52 category level and the S52.2 subcategory. They bind code selection as firmly as the code title does.

• Excludes1 at S52: Traumatic amputation of forearm (S58.-). A forearm amputation at the same encounter cannot be coded with S52.232E; S58 codes take precedence for that injury component.
• Excludes2 at S52: Fracture at wrist and hand level (S62.-). An Excludes2 note means the condition is not part of S52 but can occur alongside it. If the same injury also involves the wrist or hand, code that component separately from S62.
• Upper end of ulna (S52.0-): Olecranon and coronoid process fractures code to S52.0-, outside the S52.2- shaft codes. Confirm the record documents the shaft and not the proximal end.
• Use additional code for external cause: Add an external cause code (V00-Y99) to describe the mechanism of injury. This is particularly important for workers’ compensation, auto, and liability claims.
• Code associated injuries separately: A radial fracture or a nerve or vessel injury treated at the same encounter gets its own code. An ulna shaft fracture with radial head dislocation is a Monteggia fracture, which codes to S52.27- instead.

The ICD List lookup tool displays the full tabular list hierarchy for S52.232E, including the notes at every parent level. To compare it with neighboring forearm fracture codes, browse the searchable ICD-10-CM code library.

How Pabau keeps fracture follow-up claims moving

In many orthopedic practices, the follow-up visit is coded in one system and billed in another. Staff re-key the diagnosis and CPT codes into a clearinghouse portal, and a denial surfaces weeks later in a remittance file.

In Pabau, the checkout invoice becomes the claim. It goes to thousands of US payers through the Claim.MD clearinghouse, with no X12 files and no re-keying. Real-time eligibility checks confirm coverage before the visit, and claim statuses update from the payer.

Denied claims come back flagged for rework, and electronic remittance ties each payment to the claim it settles. A follow-up billed with the wrong 7th character gets corrected and resubmitted within days. Our Claim.MD clearinghouse guide walks through the setup.

Reduce fracture claim denials with smarter submission workflows

Pabau turns each invoice into a claim, submits it through Claim.MD to thousands of US payers, and flags denials for rework. Built for orthopedic and multi-specialty practices.

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Conclusion

S52.232E holds only while three facts stay true in the record. Active treatment has ended, the fracture was a Gustilo type I or II open fracture, and healing is on schedule. The practical move is to confirm all three during the visit, while the surgeon is still in the room.

Record the side, the Gustilo grade, and the healing status in every follow-up note. That saves the coder a query and the practice a denial. The trade-off is a few seconds of documentation per visit against weeks of rework later.

Book a demo to see how Pabau carries a fracture follow-up from checkout to a paid claim.

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Frequently asked questions about ICD-10 Code S52.232E