Patient presents with complaints of lateral ankle pain, consistent with peroneal tendonitis.  Onset of pain was gradual, reported as [duration of symptoms], and is exacerbated by activities such as running, jumping, and walking on uneven surfaces.  Patient denies any specific trauma or injury to the ankle.  Pain is localized along the posterior aspect of the lateral malleolus, radiating distally towards the fifth metatarsal base.  Palpation elicits tenderness over the peroneal tendons.  Pain is aggravated with resisted eversion and dorsiflexion of the foot.  Assessment suggests peroneal tendonitis, possibly involving peroneal tendon subluxation or peroneal tendon tear, though less likely.  Differential diagnosis includes lateral ankle sprain, cuboid syndrome, and calcaneofibular ligament injury.  Ankle range of motion is slightly limited due to pain.  No obvious edema or ecchymosis noted.  Neurovascular examination is intact.  Treatment plan includes rest, ice, compression, elevation (RICE), nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen for pain management, and physical therapy focusing on ankle strengthening and flexibility exercises.  A referral to a podiatrist or orthopedist may be warranted if symptoms persist or worsen.  Patient education provided regarding activity modification and proper footwear.  Follow-up scheduled in [duration] to assess response to treatment.  ICD-10 code M77.11 (Peroneal tendinitis) is considered.