Regex Tester & Validator

Matches ICD-10 diagnostic codes, which are alphanumeric medical codes used internationally for disease classification and billing. The pattern validates codes starting with a letter (A-T or U-Z) followed by specific numeric/alphanumeric patterns, optionally including a parenthetical description. Supports comma-separated lists of multiple codes, making it suitable for validating one or more ICD-10 codes in clinical or administrative systems.