Patient presents with complaints of left knee pain consistent with a left knee strain.  Onset of pain occurred on [Date of Onset] while [Mechanism of Injury - e.g., playing basketball, twisting the knee, etc.].  Patient reports [Character of pain - e.g., sharp, dull, aching, etc.] pain localized to the [Location of pain - e.g., medial, lateral, posterior aspect of the knee].  Pain is aggravated by [Aggravating factors - e.g., weight bearing, bending, etc.] and relieved by [Relieving factors - e.g., rest, ice, elevation].  Patient denies any popping or clicking sensation.  No history of previous knee injuries or surgeries.  Physical exam reveals [Specific findings - e.g., tenderness to palpation along the medial joint line, mild effusion, full range of motion with pain at end range of flexion].  No instability noted.  McMurray and Lachman tests are negative.  Diagnosis of left knee strain is made.  Treatment plan includes RICE therapy (rest, ice, compression, elevation), NSAIDs for pain management, and physical therapy referral for strengthening and range of motion exercises.  Patient advised to avoid activities that exacerbate pain.  Follow-up appointment scheduled in [Duration - e.g., two weeks].  Differential diagnoses considered include meniscus tear, ligament sprain, and patellar tendinitis.  ICD-10 code S86.101A assigned for left knee strain, unspecified site.