Apatient was referred to the radiology department for chronic low back pain. the radiology report indicated there was no marrow abnormality identified and the conus medullaris was unremarkable. additional findings include: l4–l5: there is a minor diffusely bulging annulus at l4–l5. a small focal disc bulge is seen in far lateral position on the left at l4–l5 within the neural foramen. no definite encroachment on the exiting nerve root at this site is seen. no significant spinal stenosis is identified. l5–s1: there is a diffusely bulging annulus at l5–s1, with a small focal disc bulge centrally at this level. there is minor disc desiccation and disc space narrowing at l5–s1. no significant spinal stenosis is seen at l5–s1. the final diagnosis is minor degenerative disc disease at l4–l5 and l5–s1, as described. what icd-10-cm code(s) is/are reported?

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.