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M25.4

⚠ Non-billable (Header)

Effusion of joint

Diseases of the musculoskeletal system and connective tissue (M00-M99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

direct

Cannot be coded with M25.4

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

⚠️ Excludes2

inherited from M25

Rules from parent category M25: Other joint disorder, not elsewhere classified

  • • abnormality of gait and mobility (R26.-)
  • • acquired deformities of limb (M20-M21)
  • • calcification of bursa (M71.4-)
  • • calcification of shoulder (joint) (M75.3)
  • • calcification of tendon (M65.2-)
  • • difficulty in walking (R26.2)
  • • temporomandibular joint disorder (M26.6-)

Child Codes (9)

M25.40Effusion, unspecified jointM25.41Effusion, shoulderM25.42Effusion, elbowM25.43Effusion, wristM25.44Effusion, handM25.45Effusion, hipM25.46Effusion, kneeM25.47Effusion, ankle and footM25.48Effusion, other site

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Code Information

CodeM25.4
BillableNo — Header code
ParentM25
CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)
Excludes13 rule(s)
Excludes27 note(s)
Child codes9

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)