---
title: "Primary Coding"
canonical: "https://wiki.patientsknowbest.com/space/api/3765305345/Primary%20Coding"
format: markdown
---
[http://fhir.patientsknowbest.com/structuredefinition/primary-coding](http://fhir.patientsknowbest.com/structuredefinition/primary-coding)

[https://www.hl7.org/fhir/STU3/structuredefinition.html](https://www.hl7.org/fhir/STU3/structuredefinition.html)

## description

Coded data provided via HL7 can contain a primary and alternate coding.

This extension indicates which coding was primary when both codings are returned in a FHIR element.

The absence of this extension on a coding should be interpreted as false.

## type

Extension

## element type

Boolean