Autoinflammatory Syndromes

Category M04, Autoinflammatory syndromes, has been created and new codes were developed to uniquely identify periodic fever syndromes (M04.1), cryopyrin-associated periodic syndromes (M04.2), other autoinflammatory syndromes (M04.8), and autoinflammatory syndrome, unspecified (M04.9).  Cryopyrin is an important mediator of inflammation, via activating interleukin 1 (IL-1). Excessive activation of IL-1 can lead to an inflammatory response, which can be harmful. This is the key to the inflammation in cryopyrin-associated periodic syndromes (CAPS), as well as certain other autoinflammatory disorders. CAPS can cause end organ damage due to chronic inflammation. Some patients with CAPS may develop hearing...

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Note:  The following article synopsis was NOT provided by the AHA. It was created by Find-A-Code/innoviHealth.

Article Overview

This article provides a high-level overview of autoinflammatory syndromes and the ICD-10-CM category associated with them. It is aimed at coders, CDI specialists, and clinicians who need to understand how these conditions are grouped and how the related terminology is used in documentation. The discussion covers the main syndrome groupings, common clinical features, and the broader inflammatory mechanisms associated with these disorders.

Why This Topic Matters

Accurate documentation and classification of autoinflammatory syndromes can affect diagnosis capture, clinical communication, and downstream data quality. This article helps readers recognize the terminology and scope of the category without relying on source-specific wording.

What You Will Learn

  • How autoinflammatory syndromes are grouped in ICD-10-CM
  • Which major syndrome families are included under the category
  • Common clinical features associated with the syndromes discussed
  • How these disorders are distinguished at a broad documentation level

Who Should Read This

  • Medical coders
  • Clinical documentation improvement specialists
  • Physicians and other clinicians
  • Health information management professionals

Codes Discussed

  • ICD-10-CM: M04
  • ICD-10-CM: M04.1
  • ICD-10-CM: M04.2
  • ICD-10-CM: M04.8
  • ICD-10-CM: M04.9

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