There are standards for capturing healthcare data in a standardized way like openEHR, and FHIR. And there are standardized ways of coding data like SNOMED CT, LOINC, RxNorm, ICD, and more. However, asking a developer to use Health IT standards correctly in an application is a lot more work than "just building the app". And making an application standard-compliant just for the sake of standards leads to a poor experience for everyone involved.