ICD-10 Code S72.022Q: Left femur epiphysis fracture, open with malunion

ICD-10 Code S72.022Q is a billable, FY2026-valid code for a displaced fracture of the epiphysis (separation) (upper) of the left femur. It is reported at a subsequent encounter, once an open type I or II fracture has healed in malunion. The most common mistake with this code is reading Q as the closed-fracture character. Closed malunion is P, and Q is its open type I or II counterpart. The Gustilo grade of the original wound is what separates Q from R.

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Key takeaways

ICD-10 Code S72.022Q is the official descriptor for a displaced fracture of the epiphysis (separation) (upper) of the left femur. It applies to a subsequent encounter for an open fracture of type I or II with malunion. The code is billable and valid for FY2026.

The 7th character Q is reserved for subsequent encounters where an open type I or II fracture has healed in a malunited position. The closed-fracture equivalent is P, not Q.

S72 extensions run in repeating triplets across each healing phase: closed, open type I or II, then open type IIIA to IIIC. That is why P, Q and R all mean malunion.

Accurate coding requires documentation confirming laterality, displacement, an open fracture of Gustilo-Anderson type I or II, the subsequent encounter stage, and evidence of malunion.

Pabau’s claims management software helps orthopedic and physical therapy practices submit S72.022Q claims accurately through the Claim.MD clearinghouse integration.

ICD-10 Code S72.022Q: full description and code details

ICD-10 Code S72.022Q is a billable, specific ICD-10-CM code valid for the FY2026 fiscal year, effective October 1, 2025. It reports a displaced fracture of the epiphysis (separation) (upper) of the left femur at a subsequent encounter. The original fracture was open, graded type I or II, and it has healed with malunion.

Per the CMS ICD-10-CM code set, S72.022Q sits within the injury chapter (S00-T88). It falls under the hip and thigh injury range (S70-S79), and specifically within S72, fractures of the femur. The code is maintained jointly by CMS and the National Center for Health Statistics (NCHS) via the official ICD-10-CM tool.

Breaking down S72.022Q: what each component means

Every character in S72.022Q carries clinical meaning. Reading the string segment by segment is how coders catch a wrong character before the claim goes out.

Displacement and side are encoded together in the 6th character rather than in separate positions. Within S72.02, the values 1, 2 and 3 mean displaced right, displaced left and displaced unspecified. The values 4, 5 and 6 mean nondisplaced right, nondisplaced left and nondisplaced unspecified. So S72.025Q is the nondisplaced left counterpart of this code, and S72.021Q is the displaced right one.

Understanding the 7th character in ICD-10 fracture coding

The 7th character is where most S72 coding errors occur, because the schema is denser than the one coders meet on simpler fracture categories. Its extensions do not stop at A, D, G, K, P and S. They run in repeating triplets instead. Each healing phase gets three characters. One covers a closed fracture, one an open type I or II fracture, and one an open type IIIA, IIIB or IIIC fracture.

That structure is the reason S72.022Q means what it means. Q is the middle member of the malunion triplet P, Q, R, so it carries the open type I or II reading. The letters I, L and O are not used anywhere in the schema, because they are too easily misread as digits. The grid below plots every S72 extension against its healing phase and fracture type.

Per the ICD-10-CM Official Guidelines for Coding and Reporting, a subsequent encounter applies once the patient has received active or definitive treatment. The patient is then receiving routine care during healing or recovery. The open or closed status in the 7th character always refers to the original fracture. It does not describe the condition of the skin at today’s visit. A wound that has long since closed does not turn an open fracture into a closed one. This distinction directly affects whether the claim passes a payer’s initial edits.

What open fracture type I or II means for S72.022Q

Because Q is an open fracture character, the grade of the original open injury decides whether Q is correct or whether R applies instead. ICD-10-CM uses the Gustilo-Anderson classification, which grades open fractures by wound size, contamination and soft tissue damage.

• Type I: A clean wound smaller than 1 cm, with minimal soft tissue injury and no crushing. Fracture patterns are usually simple.
• Type II: A wound larger than 1 cm without extensive soft tissue damage, flaps or avulsion. Contamination is moderate at most.
• Type IIIA: Extensive soft tissue damage or a high-energy mechanism, but the bone still has adequate soft tissue coverage.
• Type IIIB: Extensive soft tissue loss with periosteal stripping and bone exposure, requiring a flap for coverage.
• Type IIIC: Any open fracture with an arterial injury that needs repair.

Types I and II map to the Q character for malunion. Types IIIA, IIIB and IIIC map to the R character instead. If the provider documents an open fracture but never records a Gustilo grade, the Official Guidelines set a default. The coder uses the type I or II characters. That default makes Q the workhorse open fracture extension in practice. It is also why so many charts need a query before the grade can be trusted.

What is malunion and how does it affect coding?

Malunion means the fracture has healed, but in an unacceptable anatomical position. Bone fragments united, unlike nonunion, where they never bridged. The alignment, however, is functionally or structurally abnormal.

• Malunion (P closed, Q open type I or II, R open type IIIA to IIIC): The fracture healed. Alignment is angulated, rotated or shortened beyond acceptable limits, which may cause limb-length discrepancy, altered gait or pain.
• Nonunion (K closed, M open type I or II, N open type IIIA to IIIC): The fragments have not united after a clinically sufficient period. Imaging shows no bony bridging.
• Delayed healing (G closed, H open type I or II, J open type IIIA to IIIC): Healing is progressing, but more slowly than expected. It is not yet categorized as nonunion.
• Routine healing (D closed, E open type I or II, F open type IIIA to IIIC): Healing proceeds normally. Standard follow-up encounters use these characters.

For S72.022Q, the physician’s documentation must confirm malunion explicitly. Radiographic evidence such as an X-ray or CT showing bony union in malalignment, plus a clinical note describing the functional consequence, supports the Q designation. Without that documentation, a coder cannot choose Q over the routine-healing character. Malunion is a common audit trigger in orthopedic billing, and reviewers frequently flag codes unsupported by imaging reports.

S72.022Q vs related codes: when to use each

ICD-10 Code S72.022Q belongs to a family of closely related codes that differ by one variable each. Selecting the wrong sibling is the second most common error after 7th character mistakes. The table below covers the most clinically relevant comparators.

The AAPC Codify ICD-10-CM lookup and ICD List both provide the full S72 hierarchy with crosswalk tools. These help when checking sibling codes during complex multi-fracture encounters. Pabau’s ICD-10-CM code library covers the neighboring categories a femur fracture chart often needs, including the external cause codes reported alongside the injury.

Clinical context: displaced epiphyseal fracture of the upper femur

The upper femoral epiphysis is the growth plate region at the proximal end of the femur. In skeletally immature patients, this is where slipped capital femoral epiphysis, or SCFE, occurs. In adults, epiphyseal fractures of the upper femur typically follow high-energy trauma or arise in pathological bone.

An open fracture at this site is uncommon. It almost always follows high-energy trauma, such as a motor vehicle collision or a fall from height. That matters clinically as well as for coding. Open proximal femoral fractures carry a higher infection risk and a higher rate of healing complications. That is exactly why the malunion characters exist as a separate group.

A displaced fracture means the bone fragments have shifted out of their normal anatomical alignment. For coders, displacement is established by the treating clinician in the encounter documentation. You cannot infer it from imaging reports alone, because the physician must characterize the fracture as displaced. Many of these patients go on to physical therapy or rehabilitation, where each visit is another subsequent encounter to code.

Documentation requirements for accurate S72.022Q coding

Five documentation elements must all be present before a coder can assign ICD-10 Code S72.022Q with confidence. Missing any one of them creates an unsupportable code assignment.

• Laterality confirmed as left: The encounter note must specify the left femur. “Femur fracture” without laterality forces a less specific code.
• Displacement documented: The physician’s note or operative report must describe the fracture as displaced. The word must appear as a clinical descriptor, not only on a radiology read.
• Fracture type open, Gustilo type I or II: The record must establish that the original injury was an open fracture. A wound must have communicated with the fracture site. The note must also support a type I or II grade rather than type III, since type III malunion takes the R character.
• Encounter type subsequent: The patient is in a follow-up phase, not receiving initial definitive treatment. The note should reflect ongoing management, fixation monitoring or rehabilitation.
• Malunion confirmed: This is the most critical element. Radiographic or clinical evidence of bony union in malalignment must be documented. Useful phrases include “fracture malunion confirmed” and “healed in varus, valgus or rotational malalignment”.

The open fracture element is the hardest of the five to evidence, because the original injury is usually documented somewhere else. It may sit in an emergency department record, a transfer note or an operative report from another facility. That history has to be carried forward into the subsequent encounter note. Otherwise the coder has no basis for choosing an open fracture character.

Coders should query the treating physician if any of these five elements are absent or ambiguous. A coding query at the point of encounter costs far less than a payer audit. Practices using claims management software with integrated documentation checklists can build these five elements into their orthopedic encounter templates.

Common coding errors with S72.022Q

Nearly every error with this code involves substituting a neighboring 7th character. The list below runs from the most frequent mistake to the least.

• Using Q when the fracture was closed: Closed malunion is S72.022P. This is the single most common error. It usually comes from assuming Q follows the simplified A, D, G, K, P pattern used in other chapters.
• Using Q on a type IIIA, IIIB or IIIC open fracture: Severe open fractures with malunion take S72.022R instead.
• Submitting E when malunion is documented: E covers routine healing of the same open fracture. If imaging confirms malalignment, Q applies.
• Confusing malunion with nonunion: An open type I or II fracture that never united takes M, not Q.
• Using Q at the initial encounter: Active treatment of an open type I or II fracture takes B.
• Dropping laterality: Coding an unspecified-side variant when the note says left leaves specificity and reimbursement on the table.
• Assigning Q without imaging in the record: Auditors look for the radiology report that demonstrates union in malalignment.

Billing and reimbursement considerations for S72.022Q

S72.022Q is valid for HIPAA-covered electronic transactions and can be submitted for reimbursement in FY2026. For inpatient stays, the MS-DRG assignment depends on the principal diagnosis and the full set of secondary codes reported. It cannot be predicted from this code alone. Verify grouping against the current MS-DRG definitions manual rather than assuming an aftercare DRG.

For outpatient billing, S72.022Q typically accompanies CPT procedure codes for fracture care management, physical therapy or corrective osteotomy. The diagnosis code rarely drives prior authorization on its own, but the associated procedure codes often do. Practices should verify eligibility before each subsequent encounter visit. Pabau’s Claim.MD clearinghouse integration provides real-time eligibility verification for S72.022Q claims across thousands of US payers. It also supports electronic remittance advice, or ERA.

Building a clean claim for fracture aftercare codes starts well before submission. Flagging the 7th character at the charge capture stage catches a P-for-Q substitution while the note is still open. Corrected and secondary claims remain available afterwards, but reworking a denial costs the practice more than checking one character did.

ICD-9 to ICD-10 crosswalk for S72.022Q

Practices reconciling legacy claims may need to map S72.022Q back to its ICD-9-CM equivalent. The General Equivalence Mappings, or GEMs, published by CMS provide the official crosswalk. ICD-9-CM lacked the granularity of ICD-10-CM, so the codes below are approximate mappings rather than exact equivalents.

In ICD-9-CM, malunion was reported as a complication code alongside the fracture site code, rather than folded into the fracture code itself. Open and closed status also sat in a different character position entirely. This structural difference means one-to-one crosswalk precision is not achievable, so coders should review the CMS GEMs files directly when reconciling legacy records. ICD-10-CM folds site, fracture type and healing complication into a single code. That is one reason accurate 7th character selection carries more weight than ICD-9 coding decisions did.

How Pabau supports open fracture claim submission

In most orthopedic practices, the 7th character is decided twice. A clinician writes the note, then a coder reinterprets it days later, often without the emergency department record that established the fracture as open. Working from the follow-up note alone is how P, Q and R get swapped, and it is why fracture aftercare claims come back.

Practice management software like Pabau keeps the whole injury history in one place. The original injury details, the Gustilo grade, the imaging that confirmed malunion and the diagnosis code all live on the same patient record. The coder works from the full history rather than a single follow-up note. Custom encounter templates can prompt for laterality, displacement, fracture type and healing status before the note is signed.

From there, claims go out through Pabau’s Claim.MD clearinghouse integration with real-time eligibility checks and automated ERA posting. Fewer codes are corrected after submission, and fewer encounters need a retrospective query. The result is a shorter path from a signed note to a paid claim.

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Conclusion

Malunion coding is where orthopedic billing gets granular. ICD-10 Code S72.022Q is valid for FY2026 and billable for one specific scenario. It covers a displaced epiphyseal fracture of the upper left femur, seen at a subsequent encounter. The original fracture was open, graded type I or II, and it has healed in malalignment. Read the 7th character as a position in a triplet, not as a single letter, and the closed-versus-open distinction stops being a guess. Closed malunion is P, open type I or II is Q, and severe open malunion is R.

Pabau’s claims management software and Claim.MD clearinghouse integration give orthopedic and rehabilitation practices the tools to submit S72.022Q claims accurately the first time. Book a demo to see how Pabau handles fracture aftercare billing workflows from documentation through to electronic remittance.

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