Per the excludes comment following category 724 in ICD book, you would only be able to report codes in this category is they were NOT due to code ranges 733.00-733.09, 722.0-722.9 or 721.0-721.9.
Example, if the patient has low back pain due to lumbar spondylosis w/out myelopathy, you would only report the 721.3 code and would not separately report the 724.2. However, if the documentation specifically states the patient's low back pain is not due to the spondylosis but the symptom is due to an unknown reason, etc., then you could separately the lumbago in addition to the spondylosis code.
diagnosis codes, diagnosis coding