Gout affecting the vertebrae that is directly attributable to underlying renal impairment, classified as a secondary inflammatory arthropathy under the M10.3 subcategory.

Documentation tips

What should appear in the chart to support M10.38.

Source · Editorial brief grounded in 6 cited references ↓

• Explicitly document the causal relationship: note that gout is 'due to' or 'secondary to' renal impairment — not merely coexisting with it.
• Record the specific vertebral region involved (cervical, thoracic, lumbar, sacral) to support medical necessity and imaging orders.
• List the renal diagnosis (e.g., CKD stage, renal insufficiency) as the primary diagnosis on the claim to satisfy the M10.3 'Code First' sequencing instruction.
• Document whether the episode is acute (flare) or chronic — this determines whether M10.38 or an M1A.38x_ code is appropriate.
• Include serum uric acid levels, synovial fluid analysis if performed, and any imaging findings (e.g., CT evidence of urate crystal deposition or tophi in the spine) to support the diagnosis.
• Note any prior gout treatment, urate-lowering therapy, and current renal function labs (GFR, creatinine) to establish clinical context for auditors.

Related CPT procedures

Procedure codes commonly billed with M10.38. 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 M10.38 and adjacent codes.

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

• Sequencing M10.38 first when the renal disease should lead — the 'Code First' instruction at M10.3 is mandatory, not optional; reversing the order violates official guidelines.
• Using M10.38 for chronic vertebral gout when M1A.38x_ is required — the Excludes2 note at M10 means chronic gout cannot be coded from the M10 family.
• Defaulting to M10.9 (gout, unspecified) or M10.30 (unspecified site) when the provider has clearly documented vertebral involvement and a renal etiology — this undercodes specificity and may trigger medical necessity reviews.
• Confusing M10.38 with M10.39 (multiple sites) — use M10.39 only when multiple distinct joints are involved in the same encounter beyond the vertebrae alone.
• Omitting the renal disease code entirely, which leaves the 'Code First' instruction unfulfilled and can result in claim denial or audit vulnerability.

Clinical context

Source · Editorial summary grounded in 6 cited references ↓

Sibling codes

Other billable codes under M10.3 (laterality / anatomic variants).