ICD-10-CM Code for Right Peroneal Neuropathy
The ICD-10-CM code for right peroneal (fibular) neuropathy is G57.31 (lesion of lateral popliteal nerve, right lower limb).
Understanding the Coding
The peroneal nerve is also known as the common fibular nerve or lateral popliteal nerve in ICD-10-CM terminology 1. The coding system uses the anatomical designation "lateral popliteal nerve" to refer to what is clinically called the peroneal or common fibular nerve 1.
Laterality Specification
- G57.31 specifically designates the right lower limb 1
- For left-sided involvement, use G57.32
- For bilateral involvement, use G57.33
- For unspecified side, use G57.30
Clinical Context
This code applies to peroneal neuropathy occurring at the fibular head, which is the most common lower-extremity entrapment neuropathy 2, 3. The condition typically presents with:
- Motor deficits: Weakness of tibialis anterior and extensor hallucis longus, resulting in foot drop 2, 4
- Sensory abnormalities: Decreased sensation or dysesthesia in the distribution of the common peroneal nerve 2, 5
- Pain: Present in approximately 50% of cases, though neuropathic pain (LANSS score ≥12) is rare 5
Documentation Requirements
When using this code, clinical documentation should include 6:
- Presence or absence of ankle dorsiflexion and eversion
- Sensory deficits in peroneal nerve distribution
- Laterality (right vs. left)
- Etiology if known (post-surgical, traumatic, compressive)