ICD-10 code S72.352J: Open left femur, delayed healing

Key takeaways

ICD-10 code S72.352J covers a displaced comminuted fracture of the left femoral shaft at a follow-up visit, open Gustilo type III, with delayed healing.

The code is billable for FY2026, effective October 1, 2025. Its parent code S72.352 is not billable without a seventh character.

Seventh character J carries three facts at once: a subsequent encounter, an open fracture of type IIIA, IIIB or IIIC, and delayed healing.

J is not nonunion. Closed nonunion is K, and open type III nonunion is N.

Practice management software like Pabau builds the CMS-1500 claim from the encounter record, so the diagnosis you coded is the one that ships.

ICD-10 code S72.352J reports an open fracture of the left femoral shaft that is healing too slowly. The code is billable, and the seventh character J does most of the work.

J carries three facts at once. The visit is a follow-up, the original fracture was open Gustilo type IIIA, IIIB or IIIC, and the provider has documented delayed healing. Coders often reach for J when they mean K, which is closed nonunion. That one swap tells the payer a different clinical story than the chart does.

All three come from the chart, not the billing screen. The operative note grades the fracture, and the follow-up note settles the encounter type and the healing status.

What ICD-10 code S72.352J means, and when you can bill it

S72.352J is a billable, specific ICD-10-CM code. You report it at a follow-up visit for a displaced comminuted left femoral shaft fracture. The injury must be documented as an open fracture of Gustilo type IIIA, IIIB or IIIC. The provider must also state that healing is behind schedule.

Per the Centers for Medicare and Medicaid Services, ICD-10-CM is updated every October. The code is valid in every HIPAA-covered transaction from October 1, 2025.

One point decides most rejections on this code. S72.352 on its own is not billable, so a truncated six-character string fails at the clearinghouse. Only the full seven-character code reaches a payer.

Where S72.352J sits in the ICD-10-CM hierarchy

Five levels separate the category from the billable code. Each one narrows the description, and each one has to be supported somewhere in the chart.

Location, segment, pattern, laterality and displacement are fixed by the original injury. Only the seventh character changes as the patient moves through treatment, which is why it is the character worth checking twice.

Seventh character J packs three facts into one letter

J tells the payer that this is a subsequent encounter, that the fracture was open at Gustilo type III, and that healing has slowed. Change any one of those three facts and the character changes with it.

The grid below shows why. Fracture type runs across the top, healing status runs down the side, and J sits in a single cell at the intersection of the two.

That two-way structure is the trap. K also describes a fracture that is not healing, but K is a closed fracture with nonunion. J and K sit one letter apart and describe different injuries at different stages.

The full seventh character set for S72.352

Every valid extension for S72.352 is listed below. Each one produces a distinct billable code, and the letters I, L and O are skipped so nobody reads them as 1 or 0.

Descriptions above follow the FY2026 tabular list. You can confirm any of them in the CDC and NCHS ICD-10-CM lookup tool before you submit.

Gustilo type III is what makes this an open fracture code

The open fracture designations in the seventh character come from the Gustilo-Anderson classification. The surgeon assigns it at the index procedure, and it then follows the patient through every later visit.

• Type I: a clean wound under 1 cm, with little soft tissue damage. Takes characters B, E, H, M or Q.
• Type II: a wound larger than 1 cm without extensive soft tissue loss or flaps. Also takes B, E, H, M or Q.
• Type IIIA: extensive soft tissue damage, but the bone still has adequate soft tissue coverage. High-energy trauma counts here whatever the wound size.
• Type IIIB: extensive soft tissue loss with periosteal stripping and exposed bone. Coverage usually needs a flap.
• Type IIIC: an open fracture with an arterial injury that needs repair.

All three type III grades share one set of characters, so S72.352J covers IIIA, IIIB and IIIC alike. The distinction between them drives the surgical work, not the diagnosis code.

There is a default worth knowing. The ICD-10-CM Official Guidelines say that when the Gustilo type is not documented, you assign the characters for type I or II. At a delayed-healing follow-up, that means H rather than J.

Delayed healing is the provider’s call, not the coder’s

ICD-10-CM never defines delayed healing in weeks or months. It is a clinical judgment the treating provider writes into the note. A coder cannot read an X-ray report and decide that union is behind schedule.

The four healing states below map to different characters, and the fracture type decides which column you read.

Read that table left to right and the old error disappears. Delayed healing and nonunion are different clinical findings, and each one splits again by fracture type.

The distinction has money attached. Payers treat continued delayed healing as active management and nonunion as a trigger for surgical intervention. Tracking which one your denials cluster around starts with the denial reason codes on the remittance.

Displaced, comminuted and left: What the record has to prove

Three descriptors sit in front of the seventh character, and each has to appear in the treating provider’s note. Imaging alone does not carry them.

• Displaced: the fragments have shifted out of normal alignment. ICD-10-CM defaults a fracture to displaced when the note does not say otherwise, but an explicit statement is always safer.
• Comminuted: the bone is broken into three or more fragments. This pattern separates the code from transverse, oblique and spiral shaft fractures, which have their own subcategories.
• Shaft of the left femur: the diaphysis, meaning the long middle segment between the hip and the knee. Left has to be stated. The right-sided equivalent is S72.351J.

Miss any one of the three and the code is unsupported at audit. Query the provider rather than infer, because a corrected note costs far less than an appeal.

When S72.352J replaces S72.352C, and when it does not

Encounter type follows the nature of the care, not the visit number. A patient can be coded as an initial encounter several times while active treatment continues. The switch happens when treatment ends and the patient moves into follow-up.

For an open type III left femur fracture, the sequence usually runs like this.

Encounter type is the second most common source of rework on injury claims, behind documentation. Confirm that active treatment has ended before you reach for a subsequent character.

Sibling codes you will reach for next

Most coding on this family is a small edit to one variable. The table below holds the neighbors worth bookmarking, with the single difference that separates each from S72.352J.

S72.352K is the row to watch. It is the code most often confused with this one, and it changes both the fracture type and the healing status at the same time.

Index entries that route documentation to S72.352J

Surgeons rarely write in code descriptions. These are the phrasings that should send you to this code when you search the alphabetic index by clinical language.

• Open displaced comminuted fracture of the left femoral shaft, delayed union
• Compound comminuted left femur shaft fracture, Gustilo IIIA, slow to unite
• Left femoral diaphysis fracture, type IIIB open injury, healing behind schedule
• Grade III open left femur shaft fracture, follow-up, delayed consolidation
• Delayed union of an open comminuted left femur shaft fracture

The index path is Fracture, traumatic → femur → shaft → comminuted (displaced) → left. The seventh character comes last, from the encounter type, the documented Gustilo type and the healing status.

How an S72.352J claim moves, and where it stalls

This code does not change how a claim travels. It changes where the claim gets stuck, and it is nearly always the same place.

1. The visit. The surgeon reviews the imaging and the wound, then writes the healing status into the note. Without that line, the seventh character is a guess.
2. Charge capture. The diagnosis pairs with the work performed. A follow-up assessment often sits on an established patient visit such as CPT code 99213, with an imaging code added when films were taken.
3. Clearinghouse edits. Format checks run first. A truncated S72.352 rejects here, which is the cheapest place in the whole chain to catch it.
4. Payer adjudication. The plan reads J as a clinical statement about an open type III injury. Months of repeated delayed healing can prompt a medical necessity review.
5. Remittance. A denial on this line usually traces back to the note rather than the code choice.

That gives you a short routine to run before the claim leaves. Six checks, and five of them live in the chart:

• The note names the left femur.
• The note describes the fracture as displaced and comminuted.
• The original injury is documented as open, with a Gustilo type of IIIA, IIIB or IIIC.
• The provider, not the coder, has called the healing delayed at this visit.
• The visit is follow-up care, not active treatment of a fresh injury.
• The code on the claim line carries all seven characters.

Only the last check is a keystroke. That ratio tells you where to spend your review time, and it is not in the billing software.

Documentation that keeps an S72.352J claim clean

The record has to carry five facts at once. When it does, the claim holds up under review without an appeal.

What the record must show

• Laterality: left femur, stated explicitly. Operative notes, imaging reports and office notes should all agree.
• Displacement and pattern: displaced and comminuted, in the provider’s own assessment rather than only in a radiology impression.
• Open status and Gustilo type: the index operative note names the fracture as open and grades it IIIA, IIIB or IIIC.
• Encounter status: this visit is follow-up care, and the active treatment phase for the injury has ended.
• Delayed healing: the provider states that union is behind schedule at this visit. Imaging showing incomplete callus supports the statement without replacing it.

Mistakes that trigger a denial

• J used for a closed nonunion. That scenario is K. This is the single most common error on the code, and it misstates both the fracture type and the healing status.
• J used when the Gustilo type was never documented. The guidelines default to type I or II, so the correct character is H until the surgeon confirms a type III injury.
• J used when the note says nonunion. For an open type III fracture that is N, not J.
• A missing seventh character. S72.352 on its own is invalid and rejects before a payer ever sees it.
• Switching to a closed character once the wound heals. The open designation belongs to the original injury and does not change later.

How Pabau keeps seventh-character fracture claims clean

Most of the work above happens in two systems that rarely talk to each other. The healing statement lives in the clinical note. The claim gets rebuilt somewhere else, often from a superbill written after the visit.

Practice management software like Pabau keeps both on one record, with claims management built in. It pre-fills the CMS-1500 from the encounter, so the diagnosis you coded is the diagnosis that ships. An ICD-10-CM library lets a coder check the seventh character set without leaving the chart.

Required-field checks run before the claim unlocks, which stops incomplete submissions at the desk. On the US pipeline, Claim.MD handles submission, real-time eligibility checks and remittance posting. A denial lands back on the same record as the note behind it, so the coder reads both together.

Keep open fracture follow-up claims moving

Pabau pre-fills the CMS-1500 from the encounter record, checks eligibility before the visit, and posts remittance advice back to the same chart. Your coders read the note and the denial reason side by side.

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Conclusion

Seventh characters reward reading the operative note twice. On S72.352J the answer is settled by two lines someone else wrote. One is the Gustilo type at the index surgery, and the other is the healing status at today’s visit. Find both, or ask for them.

The failure mode here is rarely the lookup. It is a claim that says closed nonunion when the chart says open type III with delayed healing. Those are different injuries to a payer, and the note decides which one you are paid for.

Book a demo to see how Pabau ties the coded encounter to the claim that leaves your practice.

Continue your research

Not sure what makes a claim clean before it leaves? Clean claim sets out the formatting and documentation checks that stop a rejection at the clearinghouse.

Reading a denial on a fracture line? Denial codes in medical billing maps the reason codes you will meet most often, and the response each one needs.

Coding a delayed-healing follow-up on a different bone? ICD-10 code S62.291G works through the same seventh character logic for a first metacarpal fracture.

New to electronic claim submission? Claim.MD clearinghouse explains how 837P submission, remittance advice and eligibility checks fit together.

Want the wider picture behind the claim? Revenue cycle management follows a diagnosis from documentation through billing to payment.

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