ICD code S74.01XA – Right-leg sciatic nerve injury at hip and thigh

Key takeaways

S74.01XA is the billable ICD-10-CM code for traumatic sciatic nerve injury at hip and thigh level, right leg, initial encounter.

Laterality sits in the fifth character. S74.01 is the right leg, S74.02 the left leg, and S74.00 an unspecified leg.

The 7th character A applies during active treatment, not necessarily the first calendar visit. Switch to S74.01XD once care moves into the healing phase.

Non-traumatic sciatica (G57.00) and femoral nerve injury at this level (S74.11XA) are excluded. The note must confirm a traumatic mechanism.

Pabau’s claims management software flags 7th-character mismatches before submission, reducing denials on injury codes like S74.01XA.

ICD-10 Code S74.01XA: Quick reference

This table covers the core facts coders need before billing S74.01XA. Every field reflects the CMS FY2026 ICD-10-CM tabular list and the CDC/NCHS ICD-10-CM web tool.

What does S74.01XA mean? Code descriptor breakdown

S74.01XA means traumatic injury to the sciatic nerve at the hip and thigh level of the right leg, coded at the initial encounter. Each segment carries a specific coding instruction:

• S — Injury chapter (Chapter 19, S00-T88): confirms this is a traumatic injury code, not a disease or condition
• 74 — Nerve injuries at hip and thigh level: places the injury within the S74 block, covering peripheral nerve injuries at this anatomical region
• .01 — Sciatic nerve, right leg: the 0 names the sciatic nerve, separating it from the femoral nerve (S74.1) and the cutaneous sensory nerve (S74.2). The 1 sets laterality to the right leg
• X — Placeholder: S74.01 is only 5 characters, so X fills the 6th position to allow the mandatory 7th character to be appended
• A — Initial encounter: the patient is receiving active treatment for this injury

Two of those positions are the ones a coder actually chooses. The breakdown below shows which alternatives sit behind each of them.

The anatomical scope matters. S74.01XA covers the sciatic nerve trunk through the posterior hip and proximal thigh. That span runs below the piriformis muscle and above the popliteal fossa. Injuries at the knee or lower leg fall under S84, not S74.

Laterality is specified at this subcategory, so the side belongs in the code rather than in the note alone. S74.01 is the right leg and S74.02 is the left leg. S74.00 covers an unspecified leg, and payers treat it as a specificity problem when the record names a side.

Understanding the 7th character: A vs D vs S in S74.01XA

The 7th character in ICD-10 Code S74.01XA is the most frequently misapplied element of this code. Using the wrong encounter type is the top denial trigger for peripheral nerve injury claims. The same encounter-type rules run through every injury code in Chapter 19.

The most common error is a coder who keeps using S74.01XA at follow-up visits because the patient is still seeing the same provider. The ICD-10-CM Official Guidelines for Coding and Reporting (Section I.C.19) settle it. The 7th character must change to D once the injury moves from active treatment into healing.

Active treatment covers the ED visit, any surgical repair, and the acute inpatient stay. Routine wound checks, cast adjustments, and physical therapy for a healing nerve injury are subsequent encounters.

Clinical presentation: What conditions does S74.01XA cover?

S74.01XA covers traumatic injury to the sciatic nerve trunk at the hip and thigh level of the right leg. Valid scenarios include blunt trauma to the posterior hip, hip fracture-dislocations with sciatic nerve stretch, penetrating injuries, and intraoperative nerve injury during total hip arthroplasty.

The diagnosis rests on a deficit that follows the sciatic distribution, confirmed by clinical examination and, where indicated, electrodiagnostic studies. Typical findings include:

• Foot drop (weak dorsiflexion and eversion) from peroneal division involvement
• Weakness of knee flexion (hamstring involvement) from tibial division involvement
• Sensory loss along the posterior thigh, leg, and plantar foot
• Diminished or absent ankle and plantar reflexes
• Pain radiating from the posterior hip into the leg, often described as burning or electric

The code classifies traumatic peripheral neuropathy, not degenerative or inflammatory conditions. A patient presenting with sciatica from disc herniation does not qualify. The documentation must state a traumatic mechanism explicitly.

Inclusion and exclusion notes for S74.01XA

The S74 block carries several inclusion and exclusion notes that define when S74.01XA applies and when a different code is required.

• Included: Traumatic injury to the sciatic nerve at hip and thigh level, from any mechanism — blunt, penetrating, or iatrogenic during hip surgery
• Excluded (use S84 instead): Sciatic nerve injuries at the knee and lower leg level
• Excluded (use S74.2X_A instead): Injury of the cutaneous sensory nerve at hip and thigh level
• Excluded (use S74.1X_A instead): Injury of the femoral nerve at hip and thigh level
• Excluded (use S84.1 instead): Injury of the peroneal nerve at the lower leg. A peroneal deficit arising from the sciatic trunk at hip level still codes to S74.01
• Excluded (use G57.00 instead): Non-traumatic lesion of the sciatic nerve, meaning sciatica without a defined traumatic cause
• Excluded (use M54.4): Lumbago with sciatica, non-traumatic
• Burns and corrosions: The S74 block excludes burns and corrosions of nerve tissue, which code to the burns categories in Chapter 19

Neighboring codes often confused with S74.01XA

The table below covers the codes most frequently swapped with S74.01XA during chart review. Checking the sciatic and femoral entries side by side in the AAPC ICD-10-CM code lookup catches most of these swaps before submission.

Required documentation to support S74.01XA

Payers auditing S74.01XA claims look for documentation that confirms the traumatic cause, the side, and the sciatic distribution of the deficit. A missing element is enough to trigger a denial or a request for records. The wider medical billing compliance rules apply here too, including the MEAT criteria where HCC capture is in play.

• Mechanism of injury: The clinical note must describe a traumatic event. “Hip pain” without a mechanism does not support S74.01XA. Acceptable: “posterior hip trauma following motor vehicle accident,” or “iatrogenic sciatic nerve injury during right total hip arthroplasty.”
• Neurological examination findings: Map deficits to the sciatic nerve distribution. Document foot drop, hamstring weakness, and sensory loss in the posterior thigh and leg specifically, not just “lower extremity weakness.”
• Electrodiagnostic confirmation: EMG and nerve conduction studies are typically required by commercial payers for surgical management, and recommended for conservative care claims. Document findings that localize the lesion to the sciatic nerve at hip and thigh level.
• Imaging: MRI of the hip documenting nerve continuity or disruption supports the claim. It matters most when surgery is planned, or when the mechanism involved hip dislocation or fracture.
• Operative note (when applicable): Intraoperative nerve injury must appear in the operative note. Name the nerve affected, the side, and the mechanism, such as retraction, thermal, or stretch.

Payer requirements and prior authorization for S74.01XA

Payer requirements for claims carrying ICD-10 Code S74.01XA vary by plan and by setting. No single rule applies across all payers, but the patterns below reflect typical commercial and Medicare policies. Always verify with the specific payer before submitting. Claims software for coders like Pabau keeps payer policy checks and eligibility verification in one place, which cuts pre-submission errors.

• Surgical nerve repair (CPT 64858): Most commercial payers require prior authorization before sciatic nerve repair. Submit S74.01XA as the supporting diagnosis with the operative plan and the EMG/NCS results.
• Conservative management: Physical therapy claims for a traumatic sciatic nerve injury typically require an EMG/NCS report confirming the diagnosis. Some payers apply a Local Coverage Determination requiring electrodiagnostic evidence before approving extended therapy.
• Inpatient DRG: When S74.01XA is a secondary diagnosis on an inpatient stay, it may function as a complication or comorbidity and lift the DRG weight. The actual grouping depends on the principal diagnosis and the other coded conditions, so verify it against the CMS ICD code lists.
• Medicare: Medicare does not typically require prior authorization for the nerve injury diagnosis alone, though surgical repairs need documentation in the medical record. Medicare Advantage plans may impose extra requirements beyond traditional Medicare.

Common claim denial reasons for S74.01XA

Most denials on S74.01XA fall into five patterns. Understanding them before submission is far less expensive than working a remittance. Reading the denial codes alongside the remittance pins down the exact payer reason before you appeal.

• Wrong 7th character: Submitting S74.01XA at follow-up visits that are clearly healing-phase encounters. Switch to S74.01XD. This is the single most frequent denial reason for this code.
• No traumatic mechanism documented: The payer’s coding rules require a documented traumatic cause. If the note says “sciatic neuropathy” with no injury event, the code is unsupported. Recode to G57.00 or request an addendum.
• Non-specific parent code submitted: S74.01 without a 7th character is not billable. ICD-10-CM requires the complete 7-character code for specificity and reimbursement eligibility.
• Laterality mismatch: S74.01XA is the right leg, so a note describing a left hip injury needs S74.02XA. Payers deny the claim when the operative site and the coded side disagree.
• Unbundling with surgical CPT codes: Billing nerve repair (CPT 64858) and an E&M visit separately on the same date typically results in denial. Modifier 25 is what marks the visit as a separately identifiable service. Review modifiers before submission, not just the diagnosis.

CPT codes commonly billed alongside S74.01XA

The CPT codes in the table below are the most common pairings with ICD-10 Code S74.01XA. Pabau integrates with Claim.MD to submit claims to thousands of US payers. Built-in CPT and ICD-10 catalogs validate these pairings at the point of submission.

ICD-9-CM to ICD-10-CM crosswalk

The approximate ICD-9-CM predecessor to S74.01XA is 956.0, injury to sciatic nerve. The mapping comes from the General Equivalence Mappings maintained by CMS, and it is approximate rather than a 1:1 equivalent. ICD-10-CM added granularity that 956.0 never carried, namely laterality and encounter type.

For legacy data migration or appeals that reference old claims, 956.0 maps to the whole S74 category in ICD-10-CM. Payer systems processing GEMs conversions may accept a 956.0 reference in an appeal for a claim originally submitted under ICD-9-CM. Current submissions must use the full code S74.01XA.

MS-DRG assignment and inpatient reimbursement

When ICD-10 Code S74.01XA appears as a secondary diagnosis on an inpatient claim, its DRG impact depends on two things. The first is the principal diagnosis. The second is whether the nerve injury qualifies as a complication or comorbidity. Under CMS MS-DRG v43.1 FY2026 definitions, a traumatic peripheral nerve injury at this level may act as a CC. That applies when the principal diagnosis is a hip fracture or a hip dislocation.

DRG weights and payment amounts change every year with CMS IPPS rulemaking. Verify the current grouping against the FY2026 MS-DRG v43.1 definitions manual before quoting a number. Prior-year DRG weights are not a safe basis for a reimbursement estimate.

How Pabau catches 7th-character errors before the claim goes out

A wrong 7th character usually surfaces after the remittance arrives. The coder submits S74.01XA at a healing-phase visit, the payer denies it, and someone works that denial three weeks later. Correcting the character takes a minute. Finding it is what costs the practice.

Pabau keeps the diagnosis code, the encounter note, and the claim in one patient record. The built-in ICD-10 and CPT catalogs validate the pairing as the claim is built, and submission runs through our Claim.MD integration. A code that disagrees with the documented phase of care is flagged before the claim leaves the practice.

For a practice carrying steady injury-code volume, that moves the work from appeals to prevention. Laterality and encounter type get checked against the note rather than against memory, so fewer S74.01XA claims come back at all.

Reduce denials on injury codes before they happen

Pabau’s claims management tools flag 7th-character mismatches, missing traumatic-cause documentation, and laterality errors on codes like S74.01XA before the claim leaves your practice.

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Conclusion

S74.01XA is easy to look up and easy to get wrong. Two errors account for most of its denials. One is the 7th character left on A at follow-up visits. The other is a note that never names a traumatic mechanism. Laterality is the third, now that the side sits in the code itself.

All three are caught at the desk rather than in a remittance, and the check costs seconds. Put it where the coder picks the encounter character, not where the biller reconciles the month.

Book a demo to see how Pabau validates injury codes against the clinical note before the claim is submitted.

Continue your research

Need to understand how claims flow through a clearinghouse? Medical claims clearinghouse guide explains how EDI claims are validated and routed to payers.

Want to reduce injury-code denials systematically? Denial management in healthcare covers root-cause analysis for high-volume denial patterns.

Checking whether a claim is clean before it goes out? What makes a clean claim sets out the fields payers check first on injury claims.

Billing for therapy alongside a nerve injury diagnosis? What is revenue cycle management explains how injury codes sit inside the full RCM workflow.

Reading a remittance after an inpatient claim posts? Electronic remittance advice shows how to confirm whether the DRG grouper credited the CC.

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