M25.4

ICD-10Non-billable category

Effusion of joint

Official ICD-10-CM descriptor (FY2026)

Effusion of joint

M25.4 is a category heading, not a billable code. CMS does not accept it on a claim; report one of the more specific codes beneath it.

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • hydrarthrosis in yaws (A66.6)
  • intermittent hydrarthrosis (M12.4-)
  • other infective (teno)synovitis (M65.1-)

ICD-10-CM FY2026 defines 9 codes beneath M25.4. See the ICD-10-CM index for what this site publishes.

Related codes in M25

Where this code sits

Parent code
M25

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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