When lumbar region pain from the back travels down the leg, it is known as sciatica. The discomfort could radiate down the back, outside, or front of the leg. Symptoms normally only affect one side of the body at a time. Certain factors, on the other hand, may produce lumbago pain on both sides. Lower back pain can be present, however, it is not always the case. Various areas of the leg and foot may experience weakness or numbness.Codes for the ICD-10:A few ICD-10 codes have been selected to show how the clinical aspects of this disease fit with the ICD-10 reporting standards.M54.31 Sciatica, right sideM54.32 Sciatica left sideM54.41 Lumbago with sciatica, right sideM54.42 Lumbago with sciatica left sideM54.5 Low back pain