Regular expressions for HCPCS codes

This article revisits the topic of HCPCS (Healthcare Common Procedure Coding System) codes, focusing on using regular expressions to match them. It details the code format (one letter and four digits), discusses which letters are used, and covers modifiers (letter plus letter/digit). The author provides regex patterns for matching codes with optional modifiers, compares regex speed against exhaustive list search (20 ms vs 46 seconds), and notes trade-offs between accuracy and performance. The content is technical, related to programming and data matching, and suitable for IT/technology audiences.