Synovitis and Tenosynovitis

Code M65.9, Synovitis and tenosynovitis, unspecified, has been expanded to create new subcategories that include specific codes to identify synovitis and tenosynovitis of specific sites of the shoulder, upper arm, forearm, hand, thigh, lower leg, ankle and foot, other site, unspecified site, and multiple sites. Tenosynovitis, also known as synovitis, is an inflammation of the synovial membrane surrounding the tendons. The synovial membrane can become inflamed if it is damaged, infected, or irritated; and the inflammation can lead to other serious issues. Tenosynovitis is typically painful, and is most common in the wrists, hands, and feet. Symptoms...

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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 short article is about a coding update tied to synovitis and tenosynovitis and a plain-language overview of the condition. It is useful for coding professionals, clinical documentation teams, and other readers who want a general understanding of the topic and how the ICD-10-CM category has been expanded across anatomic sites. The content stays high level and does not provide detailed selection rules or examples.

Why This Topic Matters

It helps readers recognize that this diagnosis area was expanded into more specific anatomic categories and understand the general clinical context surrounding the condition.

What You Will Learn

  • How the ICD-10-CM category for synovitis and tenosynovitis was broadened
  • The general anatomy and clinical context of synovitis and tenosynovitis
  • Common symptoms, causes, and broad treatment approaches associated with the condition
  • Why documentation specificity may matter for this diagnosis area

Who Should Read This

  • Medical coders
  • Coding auditors
  • Clinical documentation specialists
  • Physicians and other clinicians
  • Revenue cycle professionals

Codes Discussed

  • ICD-10-CM: M65.9

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