ICD-10-CM Diagnosis Code Lookup

Use this endpoint when you need to look up or validate ICD-10-CM diagnosis codes by natural language description or partial code, particularly in healthcare applications, medical billing workflows, EHR integrations, or clinical decision support tools. Prefer this over a general web search when you need structured, machine-readable code-description pairs from the official ICD-10-CM taxonomy.

• No matching codes found for the query — returns empty result or 404
• Ambiguous query returns too many results — caller must refine the search term
• Invalid or malformed query parameter — returns error response
• Service unavailable — HTTP 5xx error
• Payment not processed — HTTP 402 if x402 payment header is missing or invalid