ICD-9 and ICD-10 code regex

icd_regex.md

ICD code matching regex

The regex patterns below only help validate when something is not valid ICD-10 or ICD-9. They do not ensure that the code exists. You should consult a list of valid ICD codes for that level of verification.

ICD-10-CM list: https://gist.github.com/jakebathman/063c50cb9772e4bfc864a9e1ff4ccc8d

ICD-9 list: https://gist.github.com/jakebathman/f1ed0d473f12091a708243b0ddf03d82

ICD-10/ICD-9 combined regex

Useful for validating field values that could contain both, and may or may not use decimals

([V\d]\d{2}(\.?\d{0,2})?|E\d{3}(\.?\d)?|\d{2}(\.?\d{0,2})?)|([A-TV-Z][0-9][A-Z0-9](\.?[A-Z0-9]{0,4})?)

ICD-10-CM regex

([A-TV-Z][0-9][A-Z0-9](\.?[A-Z0-9]{0,4})?)

ICD-9 regex

([V\d]\d{2}(\.?\d{0,2})?|E\d{3}(\.?\d)?|\d{2}(\.?\d{0,2})?)

@ewanmellor Slide 7 does not seem consistent with slide 9. The former says that character 2 is always numeric and the latter says alphanumeric. Do you know which it is?