Patient presents with complaints of anterior knee pain, consistent with patellar tendinitis, also known as jumper's knee.  Symptoms include pain localized to the patellar tendon, exacerbated by activities such as jumping, running, and squatting.  Onset of pain was gradual, reported as [duration] ago, and is described as [character of pain: e.g., aching, sharp, throbbing].  Patient denies any specific injury or trauma to the knee.  Physical examination reveals tenderness to palpation at the inferior pole of the patella and along the patellar tendon.  Positive patellar tendon tenderness test elicited.  No crepitus, effusion, or instability noted.  Range of motion is within normal limits, though painful with terminal extension.  Differential diagnosis includes patellofemoral pain syndrome, prepatellar bursitis, and quadriceps tendinopathy.  Assessment: Patellar tendinitis.  Treatment plan includes conservative management with rest, ice, compression, elevation (RICE), nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, and physical therapy focusing on eccentric strengthening exercises.  Patient education provided regarding activity modification and proper stretching techniques.  Follow-up appointment scheduled in [duration] to assess response to treatment.  ICD-10 code M76.41 assigned.