ICD code S72.25XA – Left nondisplaced subtrochanteric femur fracture

Key takeaways

S72.25XA is a billable FY2027 ICD-10-CM code for a closed, nondisplaced subtrochanteric fracture of the left femur at the initial encounter.

The fifth character 5 encodes both nondisplaced and left, so the code is only correct when the record documents the left femur.

If no side is documented, query the provider before coding. Without a documented side, the correct code would be S72.26XA.

The seventh character A marks active treatment for the fracture, so it covers the ED visit, the admission and any later surgery.

Pair S72.25XA with the LT modifier on side-specific procedures. An RT modifier on the same claim invites a laterality denial.

ICD-10 code S72.25XA: Code details at a glance

ICD-10 code S72.25XA is the billable code for a closed, nondisplaced subtrochanteric fracture of the left femur at the initial encounter. It is valid in the FY2027 code set, per the CMS ICD-10-CM code files. The table below gives coders the quick-reference data they need before building a claim.

Use the CDC/NCHS ICD-10-CM web tool to check effective dates and tabular notes after each annual code update.

Anatomy and clinical context: What is a subtrochanteric fracture?

A subtrochanteric fracture is a break in the femur just below the lesser trochanter, usually within about 5 centimeters of it. The region carries high compressive and tensile forces. That makes these fractures mechanically demanding to repair, and it is why accurate coding matters for medical necessity.

Three clinical details drive code selection at this site:

• Displacement status: A nondisplaced fracture means the bone fragments have not shifted from their anatomical position. A displaced subtrochanteric fracture of the left femur takes S72.22XA instead.
• Laterality: The fifth character carries the side. In S72.25XA, the 5 means nondisplaced and left, and the X at position six is a placeholder. The section below covers how to confirm it.
• Mechanism and patient profile: Nondisplaced subtrochanteric fractures most often follow low-energy falls in older patients with osteoporotic bone. High-energy trauma, such as a motor vehicle collision, tends to produce displaced patterns. The mechanism drives external cause code selection.

The open or closed status is also fixed in S72.25XA: The code describes a closed fracture. A documented open fracture keeps the same first six characters but takes seventh character B or C at the initial encounter.

Laterality: Confirm and document the left side

Laterality is where S72.25XA claims most often go wrong. The code already states the left femur, so the record has to say left too. A coder who assigns it from a note that names no side is reporting a fact the provider never documented.

Work through the record in this order before you assign the code:

1. Check every source in the encounter: The ED note, the imaging report and the operative report can each document the side. If one of them names the left femur, S72.25XA is supported.
2. Resolve conflicts: If one note says left and another says right, query the provider. Never pick the side that matches the procedure modifier.
3. Query when no side is written: Ask the provider for an addendum before the claim goes out. A side is almost always recoverable from imaging.
4. Fall back only after the query: If the provider cannot confirm a side, the correct code is S72.26XA. It is a legitimate code, but payers see it as low specificity on a surgical claim.

The grid above shows why a one-digit slip matters. S72.24XA, S72.25XA and S72.26XA differ only in the fifth character, yet each one tells the payer a different side.

The seventh character: Why A means active treatment

The seventh character in S72.25XA sets the encounter type, and it is one of the most denial-prone fields in fracture coding. “A” means the patient is receiving active treatment for the fracture at this encounter. That covers the emergency visit, the surgical admission and any later operative session still treating the injury. A first visit to a new provider after treatment has ended takes “D” instead.

Seventh character options for S72.25X

Subsequent encounters for an open fracture use E, F, H, J, M, N, Q or R instead. D, G, K and P apply only to closed fractures, and S marks a sequela. The ICD-10-CM Official Guidelines, Chapter 19, apply “initial encounter” for as long as the patient receives active treatment. Switch to D, G, K or P once active treatment has ended and the visit is for healing or recovery.

Coding guidelines: How to select S72.25XA correctly

Accurate selection of ICD-10 code S72.25XA rests on five documentation elements. Missing any one of them either points to a different code or creates a denial trigger. The path below shows where each missing element sends the claim.

Documentation requirements for a nondisplaced subtrochanteric fracture of the left femur

1. Fracture site: The provider note must say “subtrochanteric” or describe a break just below the lesser trochanter. “Proximal femur fracture” alone is not enough, because it can also describe the femoral neck or the trochanteric region.
2. Displacement status: The record must state “nondisplaced” or show alignment maintained on imaging. Under the S72 note, a fracture not documented as displaced or nondisplaced is coded as displaced, which here means S72.22XA.
3. Laterality: The record must document the left femur. If it does not, follow the query steps in the laterality section above.
4. Encounter type: Confirm that active treatment is ongoing before assigning “A”. If another facility treated the fracture and your visit is follow-up only, the seventh character is usually “D”.
5. External cause code: The Chapter 19 note directs coders to add a secondary code from Chapter 20 (V00-Y99) to show the cause of injury. Common choices include W19.XXXA (unspecified fall) and W01.0XXA (fall on same level from slipping, tripping and stumbling).

Building documentation queries around these five elements makes pre-submission audits faster. A coder who flags a missing element at entry lets the provider clarify before the claim leaves the practice. That saves a correction cycle that would otherwise hold up payment.

Tabular notes and excludes that apply to S72.25XA

The S72 category and Chapter 19 carry instructional notes that affect how S72.25XA is used and sequenced. Reviewing them before submission catches errors at the category level.

Atypical femoral fractures deserve a separate check. They are often linked to long-term bisphosphonate use and can occur in the subtrochanteric region. ICD-10-CM codes them in subcategory M84.75 (atypical femoral fracture), not in S72. If the record mentions bisphosphonate use and a stress or insufficiency pattern, confirm the mechanism before assigning S72.25XA.

Commonly confused codes: S72.25XA vs related femur fracture codes

Subtrochanteric fracture codes sit within a dense cluster of S72 variants. The table below maps the most frequently confused neighbors and the rule that separates each one from S72.25XA.

CPT codes billed with S72.25XA and Medicare coverage

Subtrochanteric fractures usually need surgical stabilization, so S72.25XA most often pairs with musculoskeletal procedure codes. Each pairing needs medical necessity documentation covering fracture severity, mobility status and implant choice.

Report the LT modifier on side-specific procedure codes such as 27244 and 27245, so the claim agrees with the left-femur diagnosis. An RT modifier next to S72.25XA is a mismatch that payer edits catch.

These pairings are subject to medical necessity review, so a valid pairing alone does not guarantee coverage. Medicare covers surgical fixation under Part A or Part B, depending on the setting. Check the Local Coverage Determination for your MAC jurisdiction before submission.

Common claim denial reasons for S72.25XA

Claims with S72.25XA are denied more often for administrative and documentation reasons than for coverage reasons. The patterns below are the ones coding communities report most consistently, though no published denial-rate data exists for this code.

• Wrong seventh character (D or S when A is correct): Assigning “D” to a surgical encounter is the most common error. A patient admitted for intramedullary nailing is under active treatment, so “A” applies even if surgery happens on day two.
• Missing external cause code: Payers increasingly audit traumatic fracture claims for a V00-Y99 external cause code. Some payer edits reject a claim without one as incomplete.
• Laterality conflict: A left-femur code such as S72.25XA paired with an RT modifier fails payer edits. So does an unspecified code such as S72.26XA paired with any side modifier.
• Displaced vs nondisplaced mismatch: If the operative report describes reducing a displaced fracture, a nondisplaced code will not match the clinical picture. Code the displacement status before reduction, not after it.
• CPT-ICD pairing edit failure: Some payer edit systems flag a diagnosis that does not fit the procedure’s standard indications. Review payer-specific medical policies before submitting high-cost implant claims.

Understanding denial management workflows helps practices track which denial types recur on fracture codes. When a denial does arrive, the denial reason codes on the remittance tell you how to route the appeal.

ICD-9-CM crosswalk for S72.25XA

The approximate ICD-9-CM equivalent for S72.25XA is 820.22 (subtrochanteric fracture of femur, closed). This mapping comes from the CMS General Equivalence Mappings (GEMs). It is approximate because ICD-9-CM did not encode laterality, displacement status or encounter type.

The ResDAC guidance on ICD codes in Medicare files explains the GEM method and its limits for longitudinal claims research. Do not treat the crosswalk as a billing equivalent for current submissions.

For quick lookups, the AAPC Codify ICD-10-CM lookup offers a searchable interface alongside the official tabular data. Our medical billing fundamentals guide covers the wider claim lifecycle. It also shows how diagnosis code selection feeds into submitting a clean claim.

How claims management software prevents laterality denials for S72.25XA

In many practices, the clinical note, the diagnosis code and the claim live in different tools. A coder reads the operative report, keys S72.25XA into a billing system and adds a modifier from memory. That handoff is where a left-femur code ends up next to an RT modifier.

Pabau, the practice management and billing platform we build, keeps clinical notes, coding and claims in one workflow. The coder sees the documented side and the encounter details in the same record that builds the claim. Pabau’s claims management software then sends the claim through its Claim.MD clearinghouse integration.

Claim.MD supports real-time eligibility checks for 400+ payers and electronic claims to thousands of US payers, with ERA remittance returned electronically. The outcome is fewer returned claims and fewer correction cycles on high-cost fracture repairs.

Reduce fracture code denials before claims leave your practice

Pabau keeps clinical notes, diagnosis codes and claims in one workflow. Coders can confirm the side, the seventh character and the CPT pairing before a claim reaches the clearinghouse.

Book a demo

Conclusion

S72.25XA is a narrow code, and that is its value. It tells the payer the fracture is subtrochanteric, nondisplaced, closed, on the left femur and under active treatment. Each of those facts has to be in the record before the code goes on a claim.

The side is the fact most worth a second look. Confirm the left femur in the note, match it with an LT modifier, and query the provider when no side is written. A query costs minutes, while a laterality denial costs a full resubmission cycle.

Book a demo to see how Pabau keeps documentation, coding and claims together, so fracture claims go out right the first time.

Continue your research

Need to understand how denied claims are tracked and appealed? Denial management in healthcare covers the CARC/RARC framework and appeals workflows for common fracture code denials.

Submitting claims electronically for the first time? 837 file format guide explains how ICD-10 codes are structured inside an electronic claim and what clearinghouse validation checks.

Want to understand payer eligibility before the procedure? Insurance eligibility verification outlines how real-time eligibility checks reduce claim rejections on high-cost surgical cases.

Frequently asked questions