M41.87 captures scoliosis of the lumbosacral region that does not fit the defined subtypes — idiopathic, congenital, neuromuscular, or secondary — coded elsewhere in the M41 category.

Documentation tips

What should appear in the chart to support M41.87.

Source · Editorial brief grounded in 6 cited references ↓

• Specify the curve location by vertebral levels (e.g., L4–S1) and the Cobb angle — payers and DRG groupers expect quantified deformity.
• Explicitly state why the scoliosis does not meet criteria for idiopathic, neuromuscular, congenital, or secondary subtypes; this is what justifies the 'other forms' classification.
• Record the direction of curvature (levoscoliosis vs. dextroscoliosis) and any rotational component — both support medical necessity for surgical or orthotic intervention.
• Document symptom burden: radiculopathy, functional limitation, gait disturbance, or pain localized to the lumbosacral region that links the curve to the patient's presentation.
• Note imaging modality and findings (standing PA X-ray, Cobb angle measurement, end vertebrae identified) to satisfy audit requirements for surgical or advanced imaging CPT codes.

Related CPT procedures

Procedure codes commonly billed with M41.87. 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 M41.87 and adjacent codes.

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

• Defaulting to M41.87 without first evaluating more specific M41 subtypes — this code is a residual category, not a generic lumbosacral scoliosis code.
• Confusing lumbosacral region (M41.87) with lumbar region (M41.86) — the lumbosacral code applies only when the curve involves the L5–S1 transitional segment.
• Assigning M41.87 when M96.89 (postprocedural scoliosis) or M96.5 (postradiation scoliosis) is the correct choice — both are Excludes1 from the M41 category and cannot be coded with M41.87.
• Coding scoliosis by when the patient presents rather than when it was first diagnosed — per ICD-10-CM convention, the etiology subtype is tied to age at diagnosis, not age at current encounter.
• Omitting a secondary code for associated conditions (e.g., radiculopathy, stenosis) when those conditions are separately documented and driving the visit.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

Sibling codes

Other billable codes under M41.8 (laterality / anatomic variants).