Patient presents with complaints consistent with medial collateral ligament (MCL) injury of the [right/left] knee.  Onset of symptoms occurred on [date] following [mechanism of injury, e.g., twisting injury during sports activity, valgus stress to the knee].  Patient reports [pain quality, e.g., sharp, aching] pain localized to the medial aspect of the [right/left] knee, with associated [symptoms, e.g., swelling, stiffness, instability, locking, popping, giving way].  Pain is exacerbated by [aggravating factors, e.g., weight-bearing, valgus stress] and relieved by [relieving factors, e.g., rest, ice, elevation].  Physical examination reveals [positive/negative] tenderness to palpation along the medial joint line, [positive/negative] joint effusion, [description of range of motion, e.g., full range of motion with pain at end range, limited flexion/extension].  Valgus stress testing at [degrees] of flexion elicits [laxity grade, e.g., grade 1, 2, or 3 laxity] compared to the contralateral knee, suggestive of an MCL sprain.  McMurray's test is negative for meniscal tear.  Differential diagnosis includes meniscus tear, anterior cruciate ligament (ACL) tear, posterior cruciate ligament (PCL) tear, and medial meniscus injury.  Imaging studies, including [X-ray, MRI] of the [right/left] knee, are recommended to confirm the diagnosis and rule out other associated injuries.  Initial treatment plan includes RICE (rest, ice, compression, elevation), NSAIDs for pain management, and referral to physical therapy for rehabilitation.  A knee brace or immobilizer may be considered for additional support.  Surgical intervention will be considered if conservative treatment fails or if the injury is severe (grade 3 MCL tear).  Follow-up appointment scheduled in [duration] to assess treatment response and discuss further management options.  ICD-10 code: [appropriate ICD-10 code, e.g., S13.41XA for sprain of medial collateral ligament of right knee, initial encounter].