Lead-induced chronic gout, unspecified site, with tophus

This code signifies a chronic inflammatory arthritis caused by elevated lead levels, characterized by the deposition of monosodium urate crystals in tissues, specifically presenting with visible or palpable tophi. The condition is persistent, and the specific anatomical location of the gouty involvement is not documented.

Apply this code when documentation explicitly states chronic gout linked to lead exposure, and the presence of tophaceous deposits is noted, but the affected joint or site is not specified. This diagnosis requires a confirmed history of lead exposure and clinical evidence of chronic gout with tophi.

• Ensure documentation clearly links the gout to lead exposure and confirms chronicity and tophi.
• Avoid using this code if a specific anatomical site of the gout is documented; instead, use a more specific M1A.1- subcategory.
• Consider sequencing this code after a code for lead poisoning (e.g., T56.0X1-) if the lead exposure is actively being treated or investigated.