2025 ICD-10-CM Diagnosis Code M65.979

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Unspecified synovitis and tenosynovitis, unspecified ankle and foot

  • M65.979 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • Short description: Unspecified synovitis and tenosynovitis, unspecified ank/ft
  • ICD-10-CM M65.979 is a new 2025 ICD-10-CM code that became effective on October 1, 2024.
  • This is the American ICD-10-CM version of M65.979 – other international versions of ICD-10 M65.979 may differ.

The following code(s) above M65.979 contain annotation back-references

 that may be applicable to M65.979:

  • M00-M99  Diseases of the musculoskeletal system and connective tissue
  • M65  Synovitis and tenosynovitis

ICD-10-CM M65.979 is grouped within Diagnostic Related Group(s) (MS-DRG v42.0):

  • 557 Tendonitis, myositis and bursitis with mcc
  • 558 Tendonitis, myositis and bursitis without mcc

Code History

  • 2025 (effective 10/1/2024): New code
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