Adult osteochondrosis of the spine localized to the thoracolumbar region — the transitional zone where the thoracic spine meets the lumbar spine, roughly T10–L2.

Documentation tips

What should appear in the chart to support M42.15.

Source · Editorial brief grounded in 5 cited references ↓

• Provider must document 'thoracolumbar region' or equivalent anatomic language (e.g., T10-L2, thoracolumbar junction) — 'mid-back' or 'lower thoracic' alone is insufficient for M42.15.
• Record imaging findings that confirm end-plate or ossification center involvement: Schmorl nodes, end-plate sclerosis or irregularity, disc space narrowing at the thoracolumbar junction on X-ray or MRI.
• Document patient age and confirm adult presentation; juvenile osteochondrosis (Scheuermann disease) routes to M42.05 regardless of region.
• Note symptom duration, functional limitations, and any prior conservative care (PT, bracing, analgesics) to support medical necessity for imaging and treatment orders.
• If multiple spinal regions are involved, document each region explicitly so the coder can determine whether M42.15 plus another site-specific code or M42.19 (multiple sites) is more accurate.

Related CPT procedures

Procedure codes commonly billed with M42.15. 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 M42.15 and adjacent codes.

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

• Selecting M42.14 (thoracic) or M42.16 (lumbar) when the documented pathology straddles the thoracolumbar junction — M42.15 is the correct code when the provider identifies the thoracolumbar region as the primary site.
• Defaulting to M42.10 (site unspecified) or M42.9 (unspecified) without querying the provider; thoracolumbar specificity is documentable and payers expect it when imaging has been performed.
• Confusing adult osteochondrosis with Scheuermann disease — M42.05 covers juvenile osteochondrosis of the thoracolumbar region; M42.15 is adult-onset only.
• Coding M42.15 as a secondary diagnosis behind a disc or degenerative code when osteochondrosis is the established primary diagnosis — sequence according to the reason for the encounter.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Sibling codes

Other billable codes under M42.1 (laterality / anatomic variants).