ICD-10 code S82.251E: Displaced comminuted fracture of shaft of right tibia

Key Takeaways

ICD-10 code S82.251E describes a displaced comminuted fracture of the shaft of the right tibia, subsequent encounter for an open fracture type I or II with malunion

The 7th character E is required for billing; the parent code S82.251 without a 7th character is not billable

Malunion (healing in improper alignment) is what distinguishes code E from D (routine healing) and G (delayed healing); physician documentation must explicitly state malunion

Pabau’s claims management software helps orthopedic and physical therapy practices submit fracture codes accurately and track claim status in real time

ICD-10 Code S82.251E is a billable, specific ICD-10-CM diagnosis code valid for claim submission on UB-04 and CMS-1500 forms. The table below covers the key facts coders need before submitting a claim.

Practices managing orthopedic follow-up care can use claims management software to track S82.251E submissions and flag encounters where the 7th character may need updating as healing progresses.

Full clinical description: Displaced comminuted fracture of shaft of right tibia

ICD-10 Code S82.251E packs five distinct clinical facts into one code. Each word in the descriptor carries a specific coding meaning.

• Displaced: The bone fragments have moved out of normal anatomical alignment. A non-displaced fracture would use a different code entirely.
• Comminuted: The bone has shattered into three or more fragments. High-energy trauma, such as a motor vehicle collision or a fall from height, is the most common mechanism. For physical therapy EMR practices managing tibia fracture rehabilitation, this fracture pattern signals a longer, more complex recovery pathway.
• Shaft of right tibia: The fracture involves the diaphysis (mid-portion) of the tibia on the right side. Laterality is explicitly coded here. Without physician documentation confirming right-sided injury, this code cannot be assigned.
• Subsequent encounter: The patient has received active treatment and is now receiving aftercare. This is the defining characteristic of the 7th character E.
• Open fracture type I or II: The fracture was originally open (bone broke through the skin), classified under the Gustilo-Anderson system as type I or type II at the time of initial treatment.
• Malunion: The fracture has healed, but in a position or alignment deemed clinically unsatisfactory by the treating physician.

All six elements must be present in the medical record to support code selection. Missing any one of them means either a different code applies, or the documentation needs a query.

Understanding the 7th character in S82.251E and the full extension table

The parent code S82.251 is not billable on its own. All S82.251x codes require a 7th character to be valid for claim submission. The table below shows all valid 7th character extensions for S82.251, per the CDC/NCHS ICD-10-CM tool.

Gustilo-Anderson type I and type II classification

The Gustilo-Anderson system, first published by Gustilo and Anderson in the Journal of Bone and Joint Surgery (1976), is the standard classification referenced in ICD-10-CM for open fracture coding. The distinction between type I/II and type IIIA/IIIB/IIIC determines which 7th character applies at both initial and subsequent encounters.

Critical coding rule: The Gustilo-Anderson type used at the subsequent encounter must match what was documented at the initial encounter. Coders cannot upgrade or downgrade the classification between visits. If the initial encounter was coded as type I/II (7th character B), subsequent encounters with malunion use E. If type III was the original classification, F applies instead.

Malunion: Clinical definition and why it changes the code

Malunion means the fracture has healed, but in a position that the treating physician judges to be clinically unsatisfactory. Common presentations include angular deformity, rotational malalignment, or shortening of the limb.

Two diagnoses are frequently confused with malunion. Nonunion means the fracture has failed to heal at all (7th characters K, M, or N). Delayed union means healing is progressing but more slowly than expected (7th characters G, H, or J). Malunion, by contrast, confirms healing has occurred but the result is mechanically or cosmetically unacceptable. The treating physician must document the word “malunion” or a description equivalent to it. Coder inference is not permitted.

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Coding guidelines: When to use ICD-10 code S82.251E

ICD-10 Code S82.251E is appropriate only when all of these conditions are met at the time of the encounter:

1. Active treatment for the fracture is complete. The patient is receiving aftercare, monitoring, or follow-up (not acute surgical care).
2. The original fracture was open and classified as Gustilo-Anderson type I or type II.
3. The fracture has healed in malunion, explicitly documented by the treating physician.
4. The fracture affects the shaft (diaphysis) of the right tibia specifically.
5. The fracture pattern was comminuted and displaced at the time of injury, and this is reflected in the original operative or radiology report.

Per ICD-10-CM Official Guidelines, the 7th character is assigned based on the provider’s documentation of the encounter type. Subsequent encounter codes are used for every encounter after active treatment ends, including cast changes, removal of internal fixation, medication adjustments, and follow-up X-rays. The HIPAA-compliant coding workflows required for claim submission demand that the encounter type is explicitly captured in the visit documentation before a coder assigns the 7th character.

Practices tracking claim outcomes across fracture follow-up visits benefit from structured ICD-10 diagnostic coding workflows that flag when a healing status changes and the 7th character needs updating.

MS-DRG mapping for S82.251E

For inpatient claims, ICD-10 Code S82.251E maps to MS-DRGs under the musculoskeletal trauma grouping. The specific DRG assigned depends on the presence of major complications and comorbidities (MCC) or complications and comorbidities (CC). MS-DRG assignments affect the relative weight and therefore the reimbursement rate. The table below reflects the principal MS-DRG associations; verify current relative weights with the CMS ICD-10 codes and coding guidelines for FY 2026.

Note: S82.251E may also group into lower-extremity fracture DRGs depending on the principal diagnosis, secondary diagnoses, and procedure codes submitted on the same claim. Run the claim through your MS-DRG grouper software before submission to confirm the actual assignment for each case.

Practices managing orthopedic inpatient billing can use ICD-10-CM subsequent encounter rules as a reference for understanding how encounter type affects claim grouping across different diagnosis categories.

Related and sibling ICD-10 codes for S82.251

The S82.251 family covers displaced comminuted fractures of the tibial shaft, with laterality and encounter type differentiated by the 5th and 7th characters. The table below shows the key lateral variants and their relationships. Use the AAPC Codify ICD-10-CM lookup to verify the full sibling code list for S82.25x.

For broader reference on related ICD-10-CM diagnosis code structures and how parent codes relate to their billable children across ICD-10 chapters, the principles are consistent regardless of body system.

S82.251E vs. S82.251A and other commonly confused codes

The following table is the key disambiguation tool for coders who regularly handle tibia fracture follow-up claims. The most common coding error is assigning S82.251A (initial encounter) at a post-surgical follow-up visit, or selecting D instead of E when the original fracture was open.

Documentation requirements for S82.251E

Inadequate documentation is the primary reason S82.251E claims fail audit. The medical record must explicitly support every element of the code descriptor. Coder inference or assumption is not sufficient under ICD-10-CM Official Guidelines.

The following elements must appear in the clinical record before S82.251E can be assigned. Using digital clinical forms with structured fields for laterality, fracture pattern, and healing status reduces the documentation gaps that lead to down-coding or denial.

• Displaced fracture confirmation: The operative report, radiology report, or physician note from the time of initial treatment must document that the fracture was displaced. This is typically found in the original surgical or ED notes.
• Comminuted pattern: The fracture must be described as comminuted (three or more fragments) in the radiology or surgical report. “Highly comminuted” or “severely comminuted” both qualify.
• Right laterality: The current encounter note and the original injury note must both specify the right tibia. If the physician documents “left” or “bilateral,” a different code applies.
• Open fracture, type I or II: The initial encounter documentation must record that the fracture was open and classify it as Gustilo-Anderson type I or type II. This classification must come from the treating physician or surgeon, not the coder.
• Malunion: The current visit note must include the physician’s statement of malunion. Acceptable language includes “healed in malunion,” “malunion present,” or a description of angular deformity / rotational malalignment with an explicit clinical judgment that healing has occurred in an unsatisfactory position.
• Subsequent encounter status: The note must indicate that active treatment has ended and this visit is for aftercare, monitoring, or management of the malunion complication.

Clinical practices that manage clinical records through structured templates reduce the time coders spend querying physicians for missing documentation. Standardized follow-up note templates that prompt for healing status, laterality, and fracture classification at each visit prevent the most common documentation failures for orthopedic follow-up coding. Teams focused on structured medical documentation forms report fewer claim corrections on fracture-type diagnostic codes.

When documentation is incomplete, coders should issue a physician query rather than assume. Assigning S82.251E without explicit malunion documentation is a coding compliance risk under both HIPAA transaction and code set standards and payer-specific auditing criteria. Practices working to improve their documentation consistency across multi-visit injury cases benefit from reviewing their clinical documentation workflows to identify where structured prompts can prevent downstream coding errors.

Conclusion

Accurate assignment of ICD-10 code S82.251E depends on three documentation facts lining up: the original fracture was open type I or II, healing has occurred in malunion, and this visit is a subsequent encounter. When any one of those facts is missing from the record, the correct code changes.

Pabau’s claims management software helps orthopedic and physical therapy practices reduce 7th character errors by tracking fracture encounter status across multi-visit care pathways. To see how structured clinical documentation works in practice, book a demo.

Continue your research

Managing orthopedic patient records across multiple follow-up visits? Physical therapy EMR software from Pabau supports multi-visit case tracking and structured clinical note capture for musculoskeletal cases.

Looking to reduce documentation gaps in your fracture follow-up notes? Digital clinical forms let you build structured templates that prompt for laterality, fracture type, and healing status at every visit.

Need to track claim outcomes across orthopedic injury codes? Medical practice scheduling software that integrates with billing workflows helps flag encounters where the encounter type changes and the ICD-10 code needs updating.

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