# Rheumatoid arthritis

Rheumatoid arthritis (RA) is a multisystem, inflammatory, autoimmune disorder; the exact etiology is unknown. RA is a disease primarily of the joints and is clinically known as an 'arthritis' although extra-articular manifestations occur. Extra-articular features include nodules, carditis and pericarditis, vasculitis, lung disorders, and other manifestations.

69896004 |Rheumatoid arthritis (disorder)| remains a primitive concept in SNOMED CT and must be stated as a parent (IS A relationship) for all rheumatoid arthritis concepts.

For example,

201776007 |Rheumatoid arthritis of sacroiliac joint (disorder)|

<figure><img src="https://4060284305-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FuoSxuN6wQMDYcvuq2wNX%2Fuploads%2FsL9CxcWUzU5MQlbDwRbI%2Fimage.png?alt=media&#x26;token=8f740b29-eff6-4f70-99f1-da3c15368342" alt=""><figcaption></figcaption></figure>

<figure><img src="https://github.com/SNOMED-Documents/snomed-editorial-guide/blob/main/authoring/clinical-finding-and-disorder/images/174690543.png" alt=""><figcaption><p>Figure. Stated view of 201776007 |Rheumatoid arthritis of sacroiliac joint (disorder)|</p></figcaption></figure>

Example of extra-articular rheumatoid manifestation,

28880005 |Rheumatoid arthritis with carditis (disorder)|

<figure><img src="https://4060284305-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FuoSxuN6wQMDYcvuq2wNX%2Fuploads%2Fv076hIbBna24hF2kbGdH%2Fimage.png?alt=media&#x26;token=e371f980-ef0b-4b2e-89ea-be12f4b8baed" alt=""><figcaption></figcaption></figure>

<figure><img src="https://github.com/SNOMED-Documents/snomed-editorial-guide/blob/main/authoring/clinical-finding-and-disorder/images/174690542.png" alt=""><figcaption><p>Figure: Stated view of 28880005 |Rheumatoid arthritis with carditis (disorder)|</p></figcaption></figure>

{% hint style="info" %}
410795001 |Juvenile rheumatoid arthritis (disorder)| has been inactivated with an inactivation reason of *Outdated* with a target replacement of 410502007 |Juvenile idiopathic arthritis (disorder)|. Subtypes of Juvenile idiopathic arthritis (disorder) are now modeled to reflect the up-to-date classification of this disorder.
{% endhint %}

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