ICD code S72.052S – Unspecified fracture of head of left femur

Key takeaways

ICD-10 code S72.052S means unspecified fracture of head of left femur, sequela, and it is billable

Unspecified describes the fracture pattern, not the site or the side, because subcategory S72.05 carries no displacement detail

A documented nondisplaced articular fracture of the left femoral head is a different code: S72.065S

The 7th character S marks a sequela encounter, and it is one of 16 valid 7th characters for the stem code S72.052

Code the residual condition first and sequence S72.052S after it, per ICD-10-CM guideline Section I.B.10

Practice management software like Pabau pre-fills claim forms from the patient record and checks required fields before submission

S72.052S is billable, but it never travels alone

ICD-10 code S72.052S is a billable ICD-10-CM diagnosis code, valid for reimbursement submission. The full clinical description is: Unspecified fracture of head of left femur, sequela.

The code sits in chapter S00-T88, injury, poisoning and certain other consequences of external causes. It belongs to the S70-S79 block for injuries to the hip and thigh.

The CMS ICD-10 codes page publishes the annual files that confirm billable status. Once the residual condition code leads, S72.052S goes out on a CMS-1500 form or an 837P electronic claim.

Both formats carry the pair in the same order, and tools built for faster claims management assemble it straight from the record.

Unspecified describes the fracture pattern, not the side

S72.052S covers a healed fracture of the left femoral head that the record never took any further. The operative note or imaging report named the site and the side.

It did not call the fracture articular, and it did not say whether the fragments were displaced. ICD-10-CM has a subcategory for exactly that situation, and S72.05 is it.

The femoral head is the ball-shaped top of the femur that fits into the acetabulum to form the hip joint. A fracture there is anatomically distinct from femoral neck and intertrochanteric fractures, which sit lower on the proximal femur.

• Unspecified: Subcategory S72.05 offers no displaced or nondisplaced choice. Its only children are the three laterality options, so the stem code says nothing about the fracture pattern.
• Head of femur: The fracture site is the femoral head itself, inside the hip joint capsule. Neck, pertrochanteric, and shaft fractures belong to other S72 subcategories.
• Left femur: Laterality sits in the 6th character. Left is 2 (S72.052x), right is 1 (S72.051x), and unspecified is 9 (S72.059x).
• Sequela: The encounter treats a late effect or residual condition caused by the original fracture, after the acute healing phase has ended.

Sequelae of femoral head fractures commonly include post-traumatic arthritis, avascular necrosis, chronic pain, and reduced range of motion.

Each residual condition needs its own diagnosis code, sequenced before S72.052S on the claim. Which one the physician is treating decides the first line of the claim.

S72.052S vs S72.065S: The wording in the note decides

Displacement changes the subcategory, not the 7th character. Femoral head fractures split across two neighboring subcategories, and the wording in the note decides which one you use.

S72.05 holds the unspecified fractures. S72.06 holds the articular fractures and their displaced and nondisplaced options.

Two defaults are worth keeping straight. The S72 tabular note codes a fracture as displaced when the record does not say displaced or nondisplaced. It codes a fracture as closed when the record is silent on open or closed.

Neither default sends you to S72.05. That subcategory is reserved for a femoral head fracture the record never described as articular.

When the detail probably exists somewhere, query the physician rather than defaulting. An operative report or a CT read usually states the fracture pattern, and a one-line clarification moves the claim to a more specific code.

Sixteen 7th characters attach to S72.052, and only one means sequela

The stem code S72.052 is not billable on its own. A 7th character is required. It records the encounter type, the healing status, and whether the fracture was open or closed.

Sixteen valid characters apply, because S72 splits its subsequent encounters by Gustilo open fracture type as well as by healing stage.

Laid out as a grid, those 16 characters form five stages of three, plus sequela on its own.

The six characters below cover closed fractures. They handle most femoral head sequela work, since a fracture not documented as open is coded as closed.

The remaining ten characters apply when the fracture was documented as open. Gustilo type I and II injuries take one character, and types IIIA, IIIB, and IIIC share another at each healing stage.

Sequela has no open or closed variant. The late-effect encounter takes S whatever the original fracture looked like. Verify current assignments against the CDC/NCHS ICD-10-CM web tool, which mirrors the official tabular list each fiscal year.

The 7th character adds no fracture detail at all

S72.052S sits at the most granular level of the S72 fracture-of-femur category. Reading the lineage from the top shows exactly where the fracture detail stops.

• S00-T88 – Injury, poisoning and certain other consequences of external causes (chapter level)
• S70-S79 – Injuries to the hip and thigh (block level)
• S72 – Fracture of femur (category level; covers head, neck, shaft, and distal fractures)
• S72.0 – Fracture of head and neck of femur (subcategory)
• S72.05 – Unspecified fracture of head of femur (5-character subcategory)
• S72.052 – Unspecified fracture of head of left femur (6-character, non-billable stem)
• S72.052S – Unspecified fracture of head of left femur, sequela (7-character, billable)

Notice what the 7th character does not do. It adds no fracture detail, since S only records that the encounter treats a late effect. The stem code already fixes every piece of clinical specificity. That is why the displaced and nondisplaced options sit one subcategory across, in S72.06.

Sequela or subsequent encounter: Five questions that settle it

This is where most billing errors start. Coders frequently submit S72.052D, subsequent encounter with routine healing, when the fracture has already healed. By then the patient is presenting for a residual condition, which is a different situation and a different code.

Work through this checklist before assigning any S72.052 encounter code.

1. Is the fracture still in the active treatment phase? If yes, use A for the first visit, or D and G for routine or delayed healing at follow-up. Do not use S.
2. Has the fracture healed or reached maximum medical improvement? If yes, move to question 3.
3. Is the patient presenting for a condition caused by the original fracture? Post-traumatic arthritis, avascular necrosis, or chronic hip pain all qualify. If yes, use S, and put the residual condition code first on the claim.
4. Has the fracture failed to heal properly? Nonunion takes K and malunion takes P. Both differ from sequela, because the fracture itself has not fully resolved.
5. Is healing delayed but still ongoing? Use G. Delayed healing means the fracture is still in process, not that a complication has resulted from it.

The distinction is simple. Sequela (S) means the original fracture has resolved and the patient is being treated for something it left behind. A subsequent encounter (D, G, K, or P) means the fracture is still the clinical problem being managed.

Four documentation elements an auditor checks first

S72.052S needs documentation that supports every element of the code description. Auditors reviewing hip fracture claims check four things before they accept a sequela encounter.

• Laterality confirmed: The record must state “left” hip or “left” femur. “Hip fracture” without a side does not support S72.052x coding.
• Fracture site and pattern recorded: S72.052S fits a femoral head fracture the record does not describe as articular. If the note documents a displaced or nondisplaced articular fracture, code from S72.06 instead.
• Sequela relationship established: The physician must link the current condition to the prior fracture. Wording such as “post-traumatic arthritis of the left hip secondary to prior femoral head fracture” satisfies this.
• Residual condition identified: The specific residual condition must be documented and coded separately. Sequence it before S72.052S, per Section I.B.10 of the FY2026 ICD-10-CM official guidelines.

Sequela coding takes two codes: one for the residual condition and one for the cause, S72.052S. The sequela code is never listed first. Missing the residual condition code is the most common reason these claims fail an audit review.

Related femoral head codes, and when each one wins

S72.052S sits inside a family of femoral head fracture codes. Coders working hip fracture claims need the sibling and adjacent codes to pick the right level of specificity.

Two rows deserve a second look. S72.059S exists for genuinely unknown laterality, and it is the row to avoid whenever the operative note names a side. S72.052A and S72.052D share the stem but belong to the active phase, so neither one ever appears alongside S72.052S on the same claim.

S72 covers the whole femur, not just the hip

S72.052S sits within a large category covering the full range of femur fractures. Knowing where femoral head fractures fall inside S72 keeps claims out of adjacent subcategories.

Femoral head fractures are the least common hip fracture type in older patients. They show up more often after high-energy trauma and posterior hip dislocations in younger patients. That is one reason the documentation tends to be surgical rather than clinical.

S72.052S groups to aftercare DRGs and skips POA reporting

On the inpatient side, S72.052S groups to the aftercare DRGs rather than an acute fracture DRG. That grouping follows what the encounter treats, which is the late effect rather than the fracture itself.

• MS-DRG grouping: S72.052S falls into DRG 559, 560, or 561, aftercare of the musculoskeletal system and connective tissue, split by mcc, cc, or neither.
• POA reporting: The code appears on the ICD-10-CM present on admission exempt list, so acute care hospitals report no POA indicator for it.
• Code history: S72.052S has been valid since October 1, 2015, and it has carried the same description through the FY2026 update effective October 1, 2025.

DRG assignment shifts with each annual grouper release, so confirm the current mapping before you rely on it for reimbursement modeling. CMS publishes the MS-DRG classifications and software files each fiscal year.

Seven errors that send femoral head sequela claims back

Femoral head fracture sequela claims attract a predictable set of errors. Each one comes back carrying a denial code, and reading that code is faster than rereading the note. Almost all of them are catchable at the point of coding.

• Reading S72.052S as a nondisplaced fracture code: It carries no displacement detail. When the record documents a nondisplaced articular fracture of the left femoral head, the sequela code is S72.065S.
• Submitting S72.052 without a 7th character: The stem code is not billable and payers reject it on sight. Always append a 7th character, which is S for a sequela encounter.
• Confusing sequela with subsequent encounter: Do not reach for the sequela character while the fracture is still healing or being actively managed. Sequela applies only after the fracture has resolved.
• Missing the residual condition code: S72.052S must follow the code for the residual condition, such as M16.52 for unilateral post-traumatic osteoarthritis of the left hip. Submitting S72.052S alone breaks the sequencing guideline and usually draws a clinical edit denial.
• Laterality errors: Right femur (S72.051x) and left femur (S72.052x) are different codes. Confirm the side in the operative or physician note, not in the diagnosis header.
• Using K or P after the fracture has healed: Nonunion and malunion mean the fracture is still the clinical problem. Once it has resolved and the patient returns with a complication, the encounter is a sequela.
• Treating the sequela code as primary: The residual condition is always sequenced first. Putting S72.052S in position 1 is a sequencing error that invalidates the claim.

Before you submit: How a sequela claim moves

Take a patient who returns 14 months after a left femoral head fracture, now with post-traumatic arthritis of the left hip. Two diagnosis codes go on the claim. M16.52 is the residual condition, so it takes position A in box 21 of the CMS-1500. S72.052S follows in position B as the cause.

The diagnosis pointer on the service line, box 24E, then leads with A, the residual condition. On an 837P electronic claim the same pair rides in the HI segment, in the same order. Reverse the two and the payer sees a sequela code in the primary position, which is where the clinical edit fires.

Four checks catch most of what a payer would send back.

• Position A holds a coded residual condition, not S72.052S.
• The note ties that condition to the prior left femoral head fracture, in words.
• The 7th character is S, and not D, G, K, or P.
• The record names the left side and stops short of calling the fracture articular.

Run those four before you hit send and the claim usually clears on the first pass. The wider routine, the one that applies across every code family, sits in our guide to clean claim submission.

How Pabau keeps fracture sequela claims moving

In most practices, a sequela claim gets built twice. The coder reads the note in the record, then retypes the diagnosis codes into a separate billing tool. A missing authorization number comes back as a rejection days later.

Practice management software like Pabau keeps that work in one place. The claim form is pre-filled from the patient record. The procedure code attached to the service lands on the charge line, and the diagnosis slots are seeded from the recorded problem list.

Built-in ICD-10-CM and CPT/HCPCS lookup libraries cover more than 20,000 codes, refreshed with every official release. You can confirm S72.052S without leaving the claim screen.

Conclusion

S72.052S tells the payer why the patient came back after a left femoral head fracture that already healed. Unspecified in this code describes the fracture pattern, since the record never called it articular. It never describes the site or the side, and it never applies while the fracture is still being treated.

Practice management software like Pabau keeps the sequela pair on one claim screen. The claim form pre-fills from the patient record, and built-in ICD-10-CM and CPT/HCPCS lookup libraries confirm S72.052S and its residual-condition partner before the claim goes out.

Book a demo to see how orthopedic sequela claims move from note to submission.

Continue your research

Need the fuller billing picture behind this sequela pair? What is revenue cycle management walks through how diagnosis coding connects to claim submission and payment reconciliation.

Coding a different stage of the same femoral head fracture? ICD-10 code S72.059P covers the malunion 7th character on the unspecified-laterality version of this subcategory.

Want the documentation checklist that keeps sequela claims from bouncing? What makes a clean claim outlines the sequencing and evidence requirements that prevent denials before they happen.

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