Patient presents with complaints of left knee pain, consistent with a suspected left medial meniscus tear.  Onset of pain occurred [duration] ago following [mechanism of injury, e.g., twisting injury while playing sports, insidious onset].  Patient reports experiencing symptoms such as medial joint line tenderness, clicking, popping, catching, locking, andor swelling in the left knee.  Pain is [character of pain, e.g., sharp, dull, aching] and is exacerbated by [exacerbating factors, e.g., weight-bearing, twisting, squatting].  Patient denies any previous history of left knee injury or surgery.  Physical examination reveals [positive findings, e.g., positive McMurray's test, positive Thessaly test, joint line tenderness, limited range of motion].  Differential diagnosis includes medial meniscus tear, medial collateral ligament sprain, patellofemoral pain syndrome, and osteoarthritis.  Imaging studies, such as MRI of the left knee, are ordered to confirm the diagnosis and evaluate the extent of the tear.  Preliminary diagnosis of left medial meniscus tear is made based on clinical presentation and physical examination findings.  Treatment plan may include conservative management with rest, ice, compression, elevation, physical therapy, nonsteroidal anti-inflammatory drugs (NSAIDs), andor corticosteroid injections.  Surgical intervention, such as arthroscopic meniscectomy or meniscus repair, may be considered if conservative treatment fails to provide adequate relief.  Patient education provided regarding the diagnosis, treatment options, and expected prognosis.  Follow-up appointment scheduled in [duration] to assess response to treatment and discuss further management.  ICD-10 code M23.21 assigned for left medial meniscus tear.