🧬 ICD-10 CM S72.001A — Fracture of Unspecified Part of Neck of Right Femur, Initial Encounter for Closed Fracture
Billable Code Confirmed
ICD-10 CM S72.001A is a complete 7-character code — the 6th character “1” specifies right-sided laterality and the mandatory 7th character “A” confirms initial encounter for a closed fracture, making the full string billable as written.
Non-Billable Parent Codes
S72 — Category-level code for all femur fractures; carries no laterality, site, or encounter detail. S72.0 — Narrows to head/neck of femur but still lacks laterality and encounter specificity. S72.00 — Confirms “unspecified part of neck” but omits laterality and the mandatory 7th character. S72.001 — Adds right-sided laterality but is still missing the required 7th character for encounter type.
Clinical Context
This code applies when imaging confirms a closed (non-open) fracture at the femoral neck on the right side, without further specification of exactly which part of the neck (subcapital, transcervical, or basicervical) is involved.
Code Classification
This is an injury diagnosis code with a mandatory 7th character; “A” designates initial encounter for active treatment of a closed fracture — not the patient’s first overall visit.
🔍 Code Description
ICD-10 CM S72.001A documents a right-sided femoral neck fracture, closed, at the “unspecified part of neck” level of specificity — meaning the provider has confirmed the fracture’s general location and laterality but hasn’t (or the documentation doesn’t) pinpoint whether it’s subcapital, midcervical, or basicervical. This code sits within the S72 fracture-of-femur category, under the head-and-neck-of-femur subcategory, and represents one of the most clinically significant fracture codes coders will encounter given the high morbidity and mortality risk associated with hip fractures in older adults.
The 7th character “A” here specifically denotes initial encounter for a closed fracture — ICD-10-CM’s femur fracture codes build multiple 7th-character options distinguishing closed vs. open fracture type (and further subdividing open fractures by Gustilo classification), which is a level of granularity not present in most other injury code families. Getting the 7th character wrong — using an open-fracture character for a closed injury, for instance — is both a compliance risk and a documentation-accuracy issue, since it misrepresents injury severity and surgical planning context.
🌳 Code Tree / Hierarchy
S72.0 Fracture of head and neck of femur ❌ Non-billable
│
├── S72.00 Fracture of unspecified part of neck of femur ❌ Non-billable
│ │
│ ├── S72.001 Fracture of unspecified part of neck of right femur ❌ Non-billable parent
│ │ │
│ │ ├── S72.001A Initial encounter for closed fracture ◀ THIS CODE ✅ Billable
│ │ ├── S72.001B Initial encounter for open fracture type I or II ✅ Billable
│ │ └── S72.001D Subsequent encounter for closed fracture with routine healing ✅ Billable
│ │
│ ├── S72.002 Fracture of unspecified part of neck of left femur ❌ Non-billable parent
│ │ │
│ │ └── S72.002A Initial encounter for closed fracture, left ✅ Billable
│ │
│ └── S72.009 Fracture of unspecified part of neck of unspecified femur ❌ Non-billable parent
│ │
│ └── S72.009A Initial encounter for closed fracture, unspecified side ✅ Billable
│
└── S72.01-S72.06 Displaced/nondisplaced fractures of specific femoral neck subtypes (Salter-Harris style specificity) ✅ Billable, more specific alternative when documentation supports itSpecificity Payer Preference
Some payers and quality-reporting programs prefer the more specific subcapital/transcervical/basicervical codes (S72.01-S72.06) over this “unspecified part” code when imaging reports support it — check documentation closely before defaulting to S72.001A if a more specific fracture pattern was actually described by radiology.
Tip
Confirm laterality against the operative report if surgery occurs during the stay — right-vs-left transcription errors on hip fracture cases are a recurring audit finding, especially when dictated notes reference “the hip” without restating laterality each time.
✅ Includes
- Right femoral neck fracture confirmed as closed (skin intact, no bone exposure) by imaging and clinical exam
- Fractures where the specific neck subregion (subcapital, transcervical, basicervical) is not documented with enough specificity to assign a more granular S72.01-S72.06 code
❌ Excludes
Excludes 1
S72.13- — Apophyseal fracture of upper end of femur is coded separately; it represents a distinct fracture pattern near a growth-plate-adjacent bony prominence rather than the femoral neck itself. M93.0- — Nontraumatic slipped upper femoral epiphysis is an atraumatic, developmental condition and cannot be coded as if it were the acute traumatic fracture captured by S72.001A.
Danger
The most common Excludes1 error involves pediatric or adolescent patients — slipped capital femoral epiphysis (M93.0-) is sometimes miscoded as a traumatic fracture when the clinical picture is actually atraumatic/developmental; confirm mechanism of injury before assigning S72.001A.
Excludes 2
S82- family — Fracture of lower leg and ankle can be reported alongside S72.001A in polytrauma presentations, since it represents an entirely separate anatomical injury site. M97.0- — Periprosthetic fracture around a prosthetic hip implant is a distinct mechanism (fracture around existing hardware) and can be reported in addition to S72.001A only if the patient has both a native fracture and a separate periprosthetic fracture elsewhere, which is clinically uncommon but not impossible.
📋 Clinical Overview
Unspecified-Part vs. Specific Femoral Neck Fracture Coding
The key coding decision is whether documentation supports the more granular subcapital/transcervical/basicervical classification or truly only supports the general “unspecified part” code.
| Feature | S72.001A (Unspecified Part, Right) | S72.011A (Displaced Subcapital, Right) | S72.002A (Unspecified Part, Left) |
|---|---|---|---|
| Documentation Requirement | Radiology/operative report confirms femoral neck fracture location and laterality but does not specify the exact subregion. | Radiology or operative report specifically identifies a subcapital fracture location with displacement status documented. | Identical specificity requirement to S72.001A, but laterality is left-sided rather than right. |
| Clinical Severity Implication | Severity/displacement not captured by the code itself; must be gleaned from the narrative documentation if needed for other purposes. | Subcapital fractures carry particularly high avascular necrosis risk given proximity to the femoral head blood supply, directly influencing surgical approach (arthroplasty vs. fixation). | Same clinical considerations as right-sided unspecified-part fractures, mirrored to the opposite side. |
| Coding Best Practice | Use only when imaging/documentation genuinely doesn’t support more specific subregion coding — don’t default here out of convenience. | Preferred when documentation supports it, since it better reflects true injury severity and surgical decision-making. | Confirm laterality carefully against all documentation sources before finalizing. |
Important
CDI trigger: if the radiology report specifies “subcapital” or “basicervical” fracture location but the final diagnosis statement just says “femoral neck fracture,” query for reconciliation — this directly affects code specificity and potentially DRG-relevant severity documentation.
Manifestations & Symptom Burden
- Severe hip/groin pain — typically acute onset following a fall or direct trauma, often with inability to bear weight.
- Leg shortening and external rotation — a classic exam finding in displaced femoral neck fractures, though may be absent in nondisplaced fractures.
- Inability to ambulate — frequently the presenting complaint prompting emergency evaluation, especially in older adult patients.
- Swelling/ecchymosis over the hip — variable depending on fracture displacement and time since injury.
- Functional decline/delirium risk — common in geriatric patients, often complicating the inpatient course independent of the fracture itself.
Tip
Given the high prevalence of hip fractures in older adults with osteoporosis, watch for an accompanying pathologic fracture consideration — if the fracture occurred with minimal or no trauma in the setting of known osteoporosis, confirm with the provider whether a pathologic fracture code (M84.-) is more appropriate than the traumatic S72.001A.
💰 HCC Risk Adjustment
ICD-10 CM S72.001A is not mapped to any HCC category under CMS-HCC V28 or RxHCC and carries zero RAF weight, consistent with its status as an acute traumatic injury rather than a chronic condition.
🏥 MS-DRG Assignment
DRG assignment for this code is procedure-dependent rather than fixed. Total hip arthroplasty performed with a principal diagnosis of hip fracture groups to DRG 521/522. Other surgical fixation (ORIF, hemiarthroplasty, intramedullary nailing) groups to the Hip & Femur Procedures Except Major Joint family, DRG 480 (with MCC), 481 (with CC), or 482 (without CC/MCC). Non-operative management groups instead to the medical Fractures of Hip & Pelvis DRGs, 533 (with MCC), 534 (with CC), or 535 (without CC/MCC). This branching is the single most important DRG-optimization consideration for this code — always confirm what procedure, if any, occurred before finalizing DRG expectations, since the difference in relative weight between the surgical and medical-management pathways can be substantial.
🔗 Related ICD-10-CM Codes
Same femoral neck fracture family (laterality/specificity variants):
- S72.002A - Fracture of unspecified part of neck of left femur, initial encounter for closed fracture
- S72.009A - Fracture of unspecified part of neck of unspecified femur, initial encounter for closed fracture
- S72.011A - Displaced fracture of epiphysis (separation) of upper end of right femur, initial encounter
Related musculoskeletal and post-fracture care codes:
- Z96.641 - Presence of right artificial hip joint, relevant after arthroplasty for this fracture
- M84.451A - Pathological fracture, right femur, initial encounter (alternative if osteoporotic/pathologic mechanism is confirmed instead of traumatic)
- S72.001D - Subsequent encounter for closed fracture with routine healing
🛠️ Commonly Associated CPT Codes
- 27235 - Percutaneous skeletal fixation of femoral neck fracture; a common minimally invasive fixation approach.
- 27236 - Open treatment of femoral fracture, proximal end, neck, internal fixation or prosthetic replacement; the standard open surgical approach for displaced fractures.
- 27130 - Total hip arthroplasty; used when arthroplasty rather than fixation is the chosen treatment.
- 73510 - Radiologic exam, hip, complete, minimum two views; standard initial imaging to confirm and characterize the fracture.
- 99223 - Initial hospital care, high complexity; typically applies to hip fracture admissions given the associated comorbidity burden and surgical planning needs.
NCCI Bundling Considerations
Surgical fixation and arthroplasty codes (27235, 27236, 27130) are mutually exclusive of one another for the same fracture on the same encounter — only one definitive fixation/replacement procedure should be billed per fracture site. Post-operative imaging performed to confirm hardware placement is typically bundled into the global surgical package rather than separately billable.
🔬 ICD-10-PCS Crosswalk
- 0QS604Z - Reposition right upper femur with internal fixation device, open approach (representative ORIF-type procedure code; exact code depends on device and approach documented).
- 0SR9019 - Replacement of right hip joint with metal synthetic substitute, cemented, open approach (representative total hip arthroplasty code; verify against operative report specifics).
- 0QS60ZZ - Reposition right upper femur, open approach, without internal fixation device (used for closed or open reduction without hardware, if applicable).
💊 Coding Scenarios and Examples
Scenario 1 — Ground-level fall, ORIF performed An 82-year-old presents after a ground-level fall with right hip pain and inability to bear weight; X-ray confirms a closed, nondisplaced right femoral neck fracture, and the patient undergoes percutaneous screw fixation the same admission.
- Correct coding: S72.001A as principal diagnosis, plus an external cause code for the fall
- Sequencing: S72.001A principal; PCS fixation procedure code drives DRG placement into the Hip & Femur Procedures family
- CDI note: Confirm whether radiology specifies a more granular subregion (subcapital, etc.) before finalizing — if so, a more specific S72.0x code may be preferable to S72.001A.
Scenario 2 — Displaced fracture treated with total hip arthroplasty A displaced closed right femoral neck fracture following a fall is treated with total hip arthroplasty rather than fixation, given displacement and patient age.
- Correct coding: S72.001A (or a more specific displaced-fracture code if documentation supports it) as principal diagnosis
- Sequencing: Principal diagnosis with the arthroplasty PCS code driving DRG 521/522 grouping
- CDI note: Verify the operative report’s fracture description matches the diagnosis code selected — displaced fractures often support a more specific S72.0- code than the “unspecified part” option.
Scenario 3 — Non-operative management in a poor surgical candidate A frail patient with multiple comorbidities sustains a closed right femoral neck fracture but is deemed too high-risk for surgery; management is conservative with pain control and mobility restriction.
- Correct coding: S72.001A as principal diagnosis; no procedure code
- Sequencing: Principal diagnosis only, groups to the medical Fractures of Hip & Pelvis DRG family (533-535) based on CC/MCC status of comorbidities
- CDI note: Document the clinical rationale for non-operative management clearly, since this significantly affects DRG expectations relative to a similar surgically-managed case.
⚠️ Coding Pitfalls and Tips
- Confirm right-vs-left laterality against every documentation source (imaging report, operative note, nursing assessment) — hip fracture laterality transcription errors are a frequent audit finding.
- Don’t default to the “unspecified part” code (S72.001A) when radiology documentation actually supports a more specific subregion code — check before finalizing.
- Always verify which procedure, if any, was performed before assuming a DRG — this code’s DRG assignment branches significantly based on surgical vs. non-operative management.
- Watch for pathologic fracture clinical clues (minimal trauma mechanism, known osteoporosis) that might warrant an M84.- code instead of the traumatic S72.001A code.
- Remember the Excludes1 distinction with M93.0- (nontraumatic slipped upper femoral epiphysis) — confirm traumatic mechanism before coding S72.001A, especially in younger patients.
- Pair with an external cause code (fall, mechanism, place of occurrence) per Chapter 20 conventions — expected for injury codes even though it doesn’t affect DRG weight.