ICD code S82.855J – Nondisplaced trimalleolar fracture of left lower leg

Key takeaways

ICD-10 code S82.855J covers a nondisplaced trimalleolar fracture of the left lower leg. The seventh character J means a subsequent encounter, an open type IIIA, IIIB, or IIIC fracture, and delayed healing.

The character H is the one to watch. S82.855H covers the same encounter and the same delayed healing, but for a milder type I or II open wound.

S82.855J is a billable, leaf-node ICD-10-CM code and it remains active in the FY2026 code set. It cannot stand in for S82.854J (right leg) or S82.856J (unspecified side).

The letters I, L, and O never appear as ICD-10-CM seventh characters, so any source citing a character L for a fracture code is wrong.

Practice management software like Pabau supports orthopedic billing, including ICD-10 code assignment and electronic claim submission through Claim.MD.

What S82.855J covers, at a glance

S82.855J is a billable, leaf-node ICD-10-CM diagnosis code. It has been valid since ICD-10-CM took effect in the United States on October 1, 2015.

The code is still active in the FY2026 set published in the CMS ICD-10-CM tabular list. The table below gives the short version, field by field.

What is a nondisplaced trimalleolar fracture?

A trimalleolar fracture involves all three bony prominences of the ankle. Those are the medial malleolus (inner tibial projection), the lateral malleolus (fibular tip), and the posterior malleolus (posterior tibial lip). This is an inherently unstable injury, because it disrupts ankle mortise integrity on three sides.

Nondisplaced means the fracture fragments have not shifted out of anatomical alignment. The fracture line is present, but the bone ends stay in normal position.

That distinction changes both surgical planning and code selection, because displaced and nondisplaced trimalleolar fractures carry different codes.

The left lower leg in S82.855J refers to the left tibia and fibula, including the distal segments that form the ankle joint. Laterality comes from the imaging report or the operative note, never from an assumption.

Why open trimalleolar fractures code differently

Trimalleolar fractures usually follow high-energy mechanisms, such as motor vehicle collisions, falls from height, or a severe ankle twist under axial load.

Open variants occur when bone or a fracture fragment pierces the skin, creating a wound that connects to the fracture site.

S82.855J covers the severe end of that range, where the wound is extensive and heavily contaminated. Those injuries carry an infection risk that closed fractures do not, which is why open fracture classification drives both clinical management and coding specificity.

The seventh character sets encounter, wound, and healing status

Every S82.855 code shares the same first six characters. The seventh alone decides the encounter type, the fracture openness, and the healing status, so it does most of the work on the claim.

Picking the wrong one is the fastest route to a medical necessity denial.

Read that list as a grid rather than an alphabet. Three columns describe the wound: closed, open type I or II, and open type IIIA to IIIC. Six rows describe the visit: initial, routine healing, delayed healing, nonunion, malunion, and sequela.

The characters then run in a fixed order. Each row of three takes the next available letters: A/B/C, D/E/F, G/H/J, K/M/N, P/Q/R, and S for sequela.

ICD-10-CM skips I, L, and O throughout, because they read too easily as the digits 1 and 0. That is why the delayed-healing row ends at J instead of I, and why character L doesn’t exist anywhere in ICD-10-CM.

At the chart, it’s quicker to work the other way round. Start from J and test the three facts it claims, one at a time.

Gustilo-Anderson grading is what separates J from H

The Gustilo-Anderson classification grades open fracture severity by wound characteristics. Gustilo and Anderson set out types I, II, and III in 1976.

The IIIA, IIIB, and IIIC subtypes arrived eight years later, in the 1984 follow-up paper by Gustilo, Mendoza, and Williams. ICD-10-CM uses that grading directly in its seventh-character definitions.

S82.855J applies only to the three bolded rows above. A type I or II wound with delayed healing takes S82.855H instead, so the wound grade drives the character choice.

Healing status moves the character too. If the physician documents nonunion of a type III open fracture, the character becomes N instead. Malunion moves it to R within the same column. The operative note must state the Gustilo-Anderson type explicitly, because a coder cannot infer it from wound size alone.

Delayed healing is a judgment the physician has to record

A subsequent encounter means the patient is receiving care after the active treatment phase. That covers cast changes, hardware monitoring, physical therapy supervision, and follow-up imaging. It is the correct encounter type for most outpatient orthopedic visits after the initial fracture management episode.

Delayed healing means bone union is progressing more slowly than expected for the injury and the patient. Type III open fractures raise that risk through periosteal stripping, contamination, and compromised blood supply. Even so, the physician has to state delayed healing in the record. A coder cannot assign J from a long timeline alone.

Why the parent code S82.855 gets rejected

The classification tree behind S82.855J shows whether you are coding at the required level of specificity. The CDC ICD-10-CM web tool confirms the hierarchy below.

• S00-T88: Injury, Poisoning and Certain Other Consequences of External Causes (Chapter 19)
• S80-S89: Injuries to the knee and lower leg
• S82: Fracture of lower leg, including ankle
• S82.8: Other fractures of lower leg
• S82.85: Trimalleolar fracture of lower leg
• S82.855: Nondisplaced trimalleolar fracture of left lower leg
• S82.855J: Subsequent encounter for open fracture type IIIA, IIIB, or IIIC with delayed healing (billable)

S82.855 on its own is not billable. Coding at the parent level, without a seventh character, produces a rejection. Always drill down to the full seven-character code that matches the documented scenario.

The S82.855 family, and the sibling that trips up claims

The S82.855 subcategory holds one code per combination of encounter type, wound severity, and healing status. The matrix below lays out the whole family, so you can see exactly where S82.855J sits.

The AAPC ICD-10-CM lookup and ICD List both carry browsable versions for chart review.

The easiest mix-up in this family is S82.855H. Both codes describe a subsequent encounter with delayed healing, and only the Gustilo type separates them. Pull the operative note before you choose between the two.

Laterality siblings matter just as much. S82.854J covers the right lower leg at the same encounter and healing status, and S82.856J covers unspecified laterality.

Use S82.856J only when the record does not name a side. If the fracture is displaced rather than nondisplaced, the left-leg equivalent is S82.852J.

Six errors that get an open fracture claim denied

The mistakes below come up repeatedly on open fracture claims, and a pre-submission check catches every one of them.

• Using J for a mild wound. A type I or II open fracture with delayed healing is S82.855H, not S82.855J.
• Using J when the note says nonunion. Nonunion of a type III open fracture is S82.855N, and malunion is S82.855R.
• Hunting for a character L. ICD-10-CM has no seventh character L, so any reference listing one is unreliable.
• Submitting the parent code. S82.855 without a seventh character is not billable and will be rejected.
• Defaulting to unspecified laterality. Use S82.856J only when no note, image, or report names a side.
• Carrying the initial character forward. Surgery uses C, and later visits move to F, J, N, or R depending on how the fracture heals.

One habit prevents most of these. Read the seventh character back as a full sentence, then compare that sentence against the physician’s own words in the assessment. If the note says type II, or says nonunion, the character has to change with it.

What the note must say before the claim goes out

The ICD-10-CM Official Guidelines for Coding and Reporting set the documentation standard for this code. Incomplete documentation is the usual reason a claim for S82.855J comes back.

Run this check before the claim leaves the practice:

• Fracture pattern: the note or imaging report confirms all three malleoli are fractured (medial, lateral, and posterior)
• Displacement status: the record states that the fracture is nondisplaced, or in anatomical alignment
• Laterality: the left lower leg is named in the operative report, the imaging, or the clinical note
• Open fracture classification: the physician documents Gustilo-Anderson type IIIA, IIIB, or IIIC explicitly, since a coder cannot assign the type III character without it
• Encounter type: the visit is follow-up care, not the initial active treatment encounter
• Delayed healing: the physician states delayed healing, rather than leaving the coder to infer it from elapsed time

Documentation at that level is what gets the claim paid on the first pass. Practices with heavy fracture follow-up volume tend to build note templates that prompt for all six elements at every visit. When delayed healing first appears, it belongs in the assessment and plan, not buried in the history.

If the same denials keep coming back on open fracture codes, read the remittance before you change the coding. The reason code tells you whether the problem is the note or the character. Our guide to common denial codes covers the ones that surface on musculoskeletal claims.

Which CPT codes pair with S82.855J at follow-up

S82.855J is a subsequent-encounter code, so it pairs with whatever service the physician delivers at the follow-up visit. The pairing depends on the work performed, not on the diagnosis code itself.

Payer policies vary, so treat the table below as common practice rather than guaranteed coverage.

Most delayed-healing visits land on 99213 or 99214, and the medical decision-making in the note decides which. If the plan changes at that visit, check the requirements for CPT code 99214 before you level it.

Watch the encounter character when surgical codes appear. CPT 27822 and 27823 are used at the initial operative episode. On a type IIIA, IIIB, or IIIC open fracture, they pair with character C rather than with S82.855J. The J character comes later, once the patient returns for monitoring and the physician records delayed healing.

How the claim moves from the follow-up visit to payment

Coding is only one step in a longer chain, and a delayed-healing claim can fail at any of them. Here is the path it takes from the exam room to the remittance.

1. The visit. The physician examines the ankle, reviews the imaging, and writes the assessment. Nondisplaced, left side, Gustilo type, and delayed healing all have to appear there.
2. Charge capture. The coder reads the note, picks the seventh character, and attaches the service code for the work done.
3. Submission. The claim goes out electronically, with S82.855J linked to each service line it supports.
4. Remittance. The payer either pays or returns a reason code, and the remittance advice lands back in the practice.

Take one patient through it. The visit falls five months after fixation of an open left trimalleolar fracture. The surgeon graded the wound IIIB in the operative note and records slow union at this visit. The claim goes out as S82.855J with 99213, plus 73610 for the ankle films.

One handoff causes most of the trouble. The Gustilo grade sits in the operative note, while the coder often works from a shorter follow-up summary. If that summary says only “open fracture”, the defensible character is H, not J.

How claims management software keeps fracture claims clean

That chain crosses at least two systems in most practices. The note sits in the chart, and the claim sits in the billing tool. Nobody reconciles the seventh character against the original record before the claim goes out.

Practice management software like Pabau keeps those steps in one place. Orthopedic and sports medicine practices can submit S82.855J claims electronically through Claim.MD, our integrated US clearinghouse.

Claim.MD reaches thousands of US payers and returns the electronic remittance advice, known as the ERA, so you can reconcile delayed-healing encounters.

Pabau’s medical claims management software holds the diagnosis, the charge, and the claim status on one screen. A coder can read the note and check the character side by side. That way a wrong seventh character gets caught in the practice, not by the payer.

Manage orthopedic billing with fewer denials

Pabau’s claims management software connects directly to Claim.MD for electronic ICD-10-CM claim submission across thousands of US payers. See how practices handle complex fracture follow-up billing in a single workflow.

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Conclusion

Open fractures with delayed healing are among the most documentation-sensitive claims in orthopedic practice. S82.855J is the right code only when four things line up in the record.

Those four are the fracture pattern, the left side, the Gustilo type III wound, and the delayed healing. Miss one of them and the J character cannot be defended on audit.

Practices billing a high volume of fracture follow-ups should pair structured note templates with a system that checks the code before the claim leaves. Book a demo to see how Pabau handles fracture coding and claim submission in one workflow.

Continue your research

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Want to know what makes a claim pass on the first try? What is a clean claim sets out the fields a payer checks before it pays.

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