M47.27 captures degenerative spinal disease of the lumbosacral region — bony changes such as osteophytes, facet arthrosis, or disc space narrowing — that produces documented nerve root compression or irritation (radiculopathy) at the L5-S1 junction and surrounding segments.

Documentation tips

What should appear in the chart to support M47.27.

Source · Editorial brief grounded in 5 cited references ↓

• Specify 'lumbosacral' or 'L5-S1' in the clinical note — 'low back' alone does not confirm lumbosacral region and could map to M47.26 (lumbar) or M47.20 (unspecified).
• Document both components: degenerative/spondylotic findings AND radiculopathy symptoms (dermatomal radiation, sensory loss, reflex change, muscle weakness) — missing either element forces a less specific code.
• Record imaging results that support the diagnosis: MRI foraminal stenosis grade, CT osteophyte size, or X-ray disc height reduction at L5-S1.
• Note neurological exam findings (straight-leg raise result, deep tendon reflex asymmetry, dermatomal sensory mapping) to substantiate radiculopathy rather than referred pain.
• Document conservative care history (duration of PT, medications tried, prior injections) when billing for interventional procedures — payers require medical necessity justification.
• If electrodiagnostic studies (EMG/NCS) were performed, reference the results; positive L5 or S1 root findings reinforce radiculopathy specificity.

Related CPT procedures

Procedure codes commonly billed with M47.27. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M47.27 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Assigning M47.27 when the chart documents lumbar radiculopathy without specifying lumbosacral involvement — default to M47.26 for lumbar or M47.20 for unspecified if the region is not clearly stated.
• Using M47.27 when myelopathy (cord signs: bilateral weakness, bowel/bladder dysfunction, Babinski sign) is present — myelopathy belongs under M47.16 or M47.17, not the M47.2x radiculopathy branch.
• Stacking M47.27 with a separate lumbar radiculopathy code (e.g., M54.4x) — radiculopathy is already embedded in M47.27; adding a redundant radiculopathy code risks claim rejection or audit flags.
• Confusing 'lumbosacral' (L5-S1, coded M47.27) with 'lumbar' (L1-L5, coded M47.26) — verify the provider's documented region before selecting the code.
• Coding M47.27 from imaging findings alone when the provider has not clinically correlated radiculopathy symptoms — imaging degenerative changes without documented radiculopathy do not support this code.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Sibling codes

Other billable codes under M47.2 (laterality / anatomic variants).