Gout caused by renal impairment affecting multiple joint sites simultaneously — classified under secondary gout with a mandatory 'code first' instruction for the underlying renal disease.

Documentation tips

What should appear in the chart to support M10.39.

Source · Editorial brief grounded in 5 cited references ↓

• Name every affected joint explicitly (e.g., 'gouty arthritis involving bilateral knees and right first MTP') so 'multiple sites' is defensible on audit.
• Document the underlying renal diagnosis by type and stage (e.g., CKD stage 3b due to hypertensive nephrosclerosis) — the 'Code First' rule requires the renal disease code to appear before M10.39 on the claim.
• Distinguish acute gout flare from chronic tophaceous gout in the note; if tophi are present, the correct category is M1A, not M10.
• Record serum uric acid level and, when performed, synovial fluid analysis or imaging findings (dual-energy CT, ultrasound double-contour sign) supporting urate crystal deposition.
• Note any concurrent manifestations that trigger additional codes — urinary tract calculi (N22), glomerular disease (N08) — if the provider documents them as present.

Related CPT procedures

Procedure codes commonly billed with M10.39. 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 M10.39 and adjacent codes.

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

• Failing to sequence the renal disease code first violates the M10.3 'Code First' instruction and can result in claim denial or medical necessity audit failure.
• Using M10.39 for chronic gout with tophi — that presentation requires M1A.39X0 (without tophus) or M1A.39X1 (with tophus) from the chronic gout category.
• Defaulting to M10.39 when only one joint is involved — use the site-specific M10.3x subcodes (shoulder, elbow, wrist, hand, hip, knee, ankle/foot, vertebrae) when a single region is documented.
• Confusing M10.39 (renal impairment etiology) with M10.49 (other secondary gout, multiple sites) — the etiology must be confirmed as renal impairment in the clinical documentation.
• Omitting additional manifestation codes (e.g., N22 for uric acid kidney stones) that the 'Use Additional Code' instruction at the M10 category level requires when those conditions are documented.

Clinical context

Source · Editorial summary grounded in 5 cited references ↓

Sibling codes

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