Patient presents with complaints consistent with lumbar degenerative disc disease (DDD).  Symptoms include chronic low back pain, radiating pain to the buttocks and thighs (sciatica), and intermittent numbness or tingling in the lower extremities.  The onset of pain is insidious, gradually worsening over time, and exacerbated by activities such as lifting, bending, and prolonged sitting.  Physical examination reveals limited lumbar range of motion, tenderness to palpation of the lumbar spine, and positive straight leg raise test indicating nerve root irritation.  The patient denies any history of trauma or recent injury.  Review of systems is otherwise unremarkable.  Assessment: Lumbar degenerative disc disease.  Differential diagnosis includes lumbar spinal stenosis, herniated disc, facet joint syndrome, and piriformis syndrome.  Plan:  Conservative management is indicated.  Treatment plan includes physical therapy focusing on core strengthening and flexibility exercises, nonsteroidal anti-inflammatory drugs (NSAIDs) for pain management, and patient education on proper body mechanics and activity modification.  Follow-up appointment scheduled in four weeks to assess response to treatment.  Imaging studies, such as lumbar X-ray or MRI, may be considered if symptoms persist or worsen.  Referral to a pain specialist or spine surgeon will be considered if conservative measures fail to provide adequate relief.  ICD-10 code M51.36 is considered for this encounter.