G57.01

🧬 ICD-10 CM G57.01 — Lesion of Sciatic Nerve, Right Lower Limb

Billable Code Confirmed

ICD-10 CM G57.01 is a valid, billable 5-character ICD-10-CM code for FY2025. All five characters are present: G57 (category) + .0 (lesion of sciatic nerve) + 1 (right lower limb). No additional characters are required.

Non-Billable Parent Codes — Never Submit These

• ❌ G57.0 — 4-character header — missing laterality character

  Always submit G57.01 (all 5 characters) when the right lower limb is specified in the documentation.

Clinical Context: Lesion vs. Sciatica

ICD-10 CM G57.01 should NOT be confused with routine sciatica (M54.31). Sciatica is typically a radicular symptom caused by compression at the spinal nerve root (e.g., from a herniated lumbar disc). A lesion of the sciatic nerve (G57.01) indicates direct structural injury, entrapment, or neuropathy of the peripheral nerve itself after it has exited the pelvis, such as piriformis syndrome or trauma from a misplaced intramuscular injection.

🔍 Code Description

ICD-10 CM G57.01 classifies a focal mononeuropathy or direct structural lesion affecting the sciatic nerve in the right lower limb.

The sciatic nerve is the largest nerve in the body, running from the lower back, through the buttock, and down the back of the leg. A lesion of this nerve can result from:

• Piriformis Syndrome: Entrapment or compression of the sciatic nerve by the piriformis muscle in the buttock.
• Trauma: Pelvic or femur fractures, or direct laceration.
• Iatrogenic Injury: Complications from total hip arthroplasty (THA) or misplaced gluteal intramuscular injections.
• Prolonged Compression: Prolonged immobilization or pressure (e.g., “wallet neuritis” or coma).

Typical symptoms include:

• Severe burning pain, tingling, or numbness radiating from the right buttock down the back of the right thigh and leg.
• Weakness in knee flexion and all foot and ankle movements (often presenting as “foot drop”).
• Loss of Achilles tendon reflex.

Note

Objective confirmation is usually obtained via Electromyography (EMG) and Nerve Conduction Studies (NCS) to differentiate a peripheral sciatic lesion from L5/S1 lumbosacral radiculopathy.

🌳 Code Tree / Hierarchy

G57 Mononeuropathies of lower limb
│  
├── G57.0 Lesion of sciatic nerve ❌ Non-billable
│ │  
│ ├── G57.00 Lesion of sciatic nerve, unspecified lower limb
│ ├── G57.01 LESION OF SCIATIC NERVE, RIGHT LOWER LIMB ◀ THIS CODE ✅
│ ├── G57.02 Lesion of sciatic nerve, left lower limb
│ └── G57.03 Lesion of sciatic nerve, bilateral

✅ Includes

The following clinical scenarios and terms map to G57.01:

• Piriformis syndrome, right
• Sciatic entrapment neuropathy, right lower limb
• Right sciatic mononeuropathy
• Iatrogenic injury to right sciatic nerve

❌ Excludes

Excludes1 — Cannot be coded together

The Excludes1 note dictates that the following conditions cannot be coded alongside G57.01 if they refer to the same clinical event/symptom.

• Sciatica NOS (M54.3-) — A symptom of radiculopathy, not a direct peripheral nerve lesion.
• Sciatica with lumbago (M54.4-)
• Current traumatic nerve disorder - see nerve injury by body region. (Note: If the lesion is an acute, current traumatic laceration or avulsion of the nerve at the hip/thigh level, use the specific injury code such as S74.01XA for injury of sciatic nerve at hip and thigh level, right leg.)

🛠️ CPT Procedural Crosswalk — wRVU & Assistant Payable Status

Below are the most common procedural CPT codes paired with G57.01 for diagnosis and treatment.

CPT Code	Description	wRVU (Facility)	Asst. Surgeon Payable?	Co-Surgeon Payable?
64712	Neuroplasty, major peripheral nerve, arm or leg, open; sciatic nerve	10.02	Yes (Indicator 2)	No (Indicator 0)
64445	Injection, anesthetic agent; sciatic nerve, single	1.50	No (Indicator 0)	No (Indicator 0)
20552	Injection(s); single or multiple trigger point(s), 1 or 2 muscle(s) (e.g., Piriformis injection)	0.88	No (Indicator 0)	No (Indicator 0)
95909	Nerve conduction studies; 5-6 studies	1.00	No (Indicator 0)	No (Indicator 0)
95886	Needle electromyography, each extremity, with related paraspinal areas, when performed, done with nerve conduction; complete	1.55	No (Indicator 0)	No (Indicator 0)

Note: wRVU values are estimates based on the standard CMS Physician Fee Schedule. Check current year exact values.

💊 Coding Scenarios

Scenario 1 — Diagnostic EMG/NCS for Suspected Piriformis Syndrome

Clinical Vignette: A 45-year-old male presents to the physiatrist complaining of right buttock pain that radiates down his right posterior thigh, worsening when he sits for long periods. Straight leg raise is negative, but the FAIR test (flexion, adduction, internal rotation) elicits severe pain in the right gluteal region. The physician performs a needle EMG and NCS, diagnosing right piriformis syndrome causing a focal sciatic neuropathy.

CPT / HCPCS:

• 95886 — Needle EMG, complete, performed with NCS
• 95909 — Nerve conduction studies; 5-6 studies

ICD-10-CM:

• G57.01 — Lesion of sciatic nerve, right lower limb (Piriformis syndrome maps directly here)

Scenario 2 — Sciatic Nerve Block for Post-Surgical Neuropathy

Clinical Vignette: A 68-year-old female developed right “foot drop” and burning posterior thigh pain immediately following a complicated right total hip arthroplasty three months ago. Conservative management has failed. She is seen in the pain management clinic where an ultrasound-guided therapeutic local anesthetic and steroid injection of the right sciatic nerve is performed.

CPT / HCPCS:

• 64445-RT — Injection, anesthetic agent; sciatic nerve, single, right side
• 76942-26 — Ultrasonic guidance for needle placement

ICD-10-CM:

• G57.01 — Lesion of sciatic nerve, right lower limb (Provides medical necessity for the specific nerve block)
• G97.82 — Other postprocedural complications and disorders of nervous system (Optional secondary code to show iatrogenic nature)

Scenario 3 — Lumbar Radiculopathy (Incorrect use of G57.01)

Clinical Vignette: A 50-year-old male presents with right leg pain radiating to his foot. An MRI of the lumbar spine shows a severe L5/S1 disc herniation impinging the right S1 nerve root. The physician diagnoses “Right-sided sciatica secondary to herniated disc.”

Action / Outcome:

If the coder searches “sciatica” and incorrectly selects a sciatic nerve lesion code based on anatomy, the claim will be inaccurate.

Corrected ICD-10-CM Coding (Instead of G57.01):

• M51.17 — Intervertebral disc disorders with radiculopathy, lumbosacral region (Or M54.31 for Sciatica, right side, depending on documentation specifics)

⚠️ Coding Pitfalls and Tips

	Pitfall or Tip
❌	Do not use for spinal nerve root compression: Do not use G57.01 if the patient’s symptoms are stemming from the spine (herniated disc, spinal stenosis). Use M54.31 (Sciatica, right side) or the appropriate radiculopathy/disc disorder code instead.
✅	Map Piriformis Syndrome here: The ICD-10-CM Alphabetic Index directs coders looking up “Syndrome, piriformis” straight to category G57.0-. Use G57.01 for right-sided piriformis syndrome.
❌	Do not code separately if bilateral: If the patient has confirmed bilateral sciatic nerve lesions or bilateral piriformis syndrome, do not bill G57.01 and G57.02 together. Use the combination code G57.03 (Lesion of sciatic nerve, bilateral).
✅	Append Laterality Modifiers: When billing procedural interventions (like 64712 or 64445), always append the -RT modifier to match the laterality of diagnosis code G57.01 to ensure swift claims processing.

📚 Sources

1. CMS/NCHS. ICD-10-CM Official Guidelines for Coding and Reporting, FY2025. Tabular List — G57.01 Lesion of sciatic nerve, right lower limb.

2. American Medical Association (AMA). CPT 2024/2025 Professional Edition. Nervous System — Somatic Nerves (Injections and Neuroplasty).