ICD code S82.456G – Nondisplaced comminuted fracture of fibula, delayed healing

Key takeaways

ICD-10 code S82.456G reports a nondisplaced comminuted fibula shaft fracture with delayed healing when the record never states the side.

If the chart names the leg, code S82.454G for the right fibula or S82.455G for the left.

The 7th character G means a subsequent encounter for a closed fracture with delayed healing, distinct from D (routine healing) and K (nonunion).

Support G with a clinician note or imaging read that says healing is slower than expected, plus an updated plan.

When the record is silent on displacement, ICD-10-CM defaults to displaced, so nondisplaced has to be documented.

ICD-10 code S82.456G covers a slow-healing fibula shaft break

ICD-10 code S82.456G reports a nondisplaced comminuted fracture of the fibula shaft at a follow-up visit where healing is delayed. It is the unspecified-side version of the code. So it fits only when the record never says right or left.

The code is billable and has been valid since October 1, 2015, the start of FY2016. You’ll find it in the CMS ICD-10-CM code set.

Each character of S82.456G tells part of the story

Read the code from left to right and it builds the diagnosis one piece at a time. A slip on any character changes the bone, the pattern, the side, or the visit type.

Comminuted means the bone broke into three or more fragments. Nondisplaced means those fragments stayed in alignment. Both words need to appear in the record.

Here’s the catch. Under the ICD-10-CM fracture guidelines, a fracture not documented as displaced or nondisplaced is coded as displaced. So a note that only says “comminuted fibula shaft fracture” leads to S82.453G, not S82.456G.

Choose G only when healing falls behind

S82.456 takes 16 valid 7th characters, all listed in the CDC/NCHS ICD-10-CM tool. At a closed-fracture follow-up, the choice usually comes down to four.

Open fractures follow their own track. Delayed healing of an open fracture uses H for Gustilo type I or II, or J for type IIIA, IIIB or IIIC. Initial encounters use A, B or C, and S marks a sequela.

Side and pattern shift the group too. A right fibula shaft fracture that the index files under “other” takes S82.491H when the open wound is Gustilo type I or II.

The trap sits between the G and K characters. A note that says “delayed union” points to G. Only a documented nonunion supports K, so never upgrade on a hunch. Likewise, a note that reads “healing as expected” keeps you on D.

Put together, the full code comes from three checks. Run them in this order on every follow-up note.

A worked example: One fibula, four visits

Here’s how a typical case moves through the codes. A patient falls and takes a blow to the outer leg. The ED note describes a nondisplaced comminuted fibula shaft fracture but never records the side.

1. ED visit. Active treatment starts, so the initial encounter character applies. With no side documented, that’s S82.456A.
2. Six-week check. Callus is forming and the patient walks in a boot. Healing is on track, so the code is S82.456D.
3. Ten-week check. The radiology read notes minimal callus, and the orthopedist writes “delayed union.” Now the code is S82.456G.
4. Later visits. G stays while the clinician keeps documenting delayed healing. If a nonunion is confirmed, switch to S82.456K.

Now for the twist. At the ten-week visit, the orthopedist’s note also says “left fibula.” From then on, code the side the record states, which makes it S82.455G. Unspecified codes cover missing details. They aren’t a shortcut.

What the chart needs before you code G

Auditors look for a clear line from the record to the 7th character. Check for these points before you assign S82.456G.

• A healing-status statement. The clinician writes “delayed healing” or “delayed union” in plain words. “No change since prior imaging” on its own won’t carry G.
• Imaging that backs it up. The radiology report or the clinician’s read describes callus that lags behind the expected stage.
• The fracture pattern. The note states both comminuted and nondisplaced, and places the break on the fibula shaft.
• The encounter type. Active treatment is complete and the patient is in the healing phase, per ICD-10-CM Official Guidelines Section I.C.19.a.
• An updated plan. The note shows a response to the delay, such as longer immobilization, a stimulator referral, or a surgical consult.
• A last look for laterality. Search the whole record for the side before you settle on the unspecified code.

Why the unspecified side should be your last resort

S82.456G exists for records that never name the leg. That does happen, often with outside referrals or brief ED notes. Even so, most fibula fractures have a documented side somewhere in the chart.

Check the imaging report, the referral and any operative note first. If one of them states the side, use the lateral code. Some payers question unspecified-side codes, and a specified code holds up better on audit.

One more pitfall to watch. The fibula has no condyle, so a note or lookup that pairs this code with a “lateral condyle” has confused it with the tibia. A lateral tibial condyle fracture codes to S82.12-, a different subcategory altogether.

Add an external cause code with the right character

There’s no national mandate for external cause codes, but some states and payers require them. When you report one at a follow-up, give it the D character to match the subsequent encounter.

CPT codes that usually travel with S82.456G

The diagnosis explains why the visit happened. The CPT code describes what the provider did. These pairings are common on delayed-healing claims. The follow-up films that show lagging callus usually bill as 73590.

Watch the global period closely. If your practice billed 27780, 27781 or 27784, related follow-up within 90 days is usually part of the surgical package. That includes visits for delayed healing. Report them with 99024 and keep the G-coded diagnosis on the record.

How the claim moves, and where it trips

A delayed-healing claim passes four stops before payment. Here’s the route, and what tends to go wrong at each one.

1. Chart. The clinician documents healing status, pattern and side. Missing words here cause most later problems.
2. Coding. The coder takes the 7th character from the note and imaging read, not from the visit reason.
3. Submission. The claim passes edits and a clearinghouse on its way to the payer. A clean claim has every required field filled.
4. Adjudication. The payer checks the diagnosis against the CPT code and its own policy. Mismatches often return with CO-4 or CO-11 adjustment reason codes (CARCs).

Our guide to denial codes in medical billing explains each remittance code. Then trace every denial to its cause in a denial management workflow. A documentation problem and a coding problem need different fixes.

Before you submit: A quick checklist

Run through this list on every S82.456G claim. It takes about a minute.

• The note says “delayed healing” or “delayed union” in so many words.
• The imaging read supports the delay.
• The fracture is documented as nondisplaced and comminuted, on the fibula shaft.
• The side is missing from the whole record. If not, switch to S82.454G or S82.455G.
• The encounter is subsequent, with active treatment complete.
• The CPT code matches the work done and respects any global period.
• Any external cause code carries the D character.
• Coverage was confirmed through insurance eligibility verification for this date of service.

Payer rules can raise the bar

The official guidelines set the floor. Payers then add their own layer, and Medicare’s local coverage determinations (LCDs) vary by contractor.

Bone growth stimulators show the difference clearly. Medicare’s osteogenesis stimulator policy covers noninvasive stimulators for long-bone nonunion, not for delayed healing. A G-coded record alone usually won’t support that order.

Extended physical therapy may need prior authorization too, so attach the imaging report to the request. If you carry many fracture cases, give them a dedicated queue in your revenue cycle management workflow. That way, claims don’t age while a payer waits for records.

How Pabau supports fracture follow-up claims

Many delayed-healing denials start with retyping. Details from the note get re-entered on the claim, and the side or healing status slips along the way.

Pabau, the practice management and billing platform we build, pre-fills claims from the invoice and validates required fields before a claim goes out. Eligibility checks run through Claim.MD before the visit, and the finished claim submits through Claim.MD too.

Your team still owns the 7th character and the laterality call. The difference is that they spend that time on coding decisions rather than rework. You can see the full workflow on our claims management software page.

Submit fracture follow-up claims with less rework

Pabau pre-fills claims from the invoice, validates required fields, and submits through Claim.MD, with eligibility checks through Claim.MD before the visit. Your coders keep their time for the diagnosis instead of retyping.

Book a demo

Conclusion

S82.456G is a narrow code. It fits one fracture pattern, one healing status, and a record that never names the side. That last condition should be rare, so treat every S82.456G as a prompt to search the chart once more.

Get three facts on paper before you code: delayed healing, a nondisplaced comminuted shaft pattern, and the side if it exists. With those in place, the 7th character holds up on audit.

Book a demo to see how Pabau pre-fills fracture claims from the invoice and checks them before they reach the payer.

Continue your research

Need a denial management framework for fracture claims? Denial management in healthcare covers how to build a denial tracking and appeal workflow by denial category.

Submitting fracture claims electronically? Clean claim submission checklist walks through the pre-submission steps that reduce first-pass denial rates on musculoskeletal claims.

Want to understand the clearinghouse behind the submission? Claim.MD clearinghouse overview explains how electronic claim routing works and what happens between the practice and the payer.

Frequently asked questions