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M25.4

Non-billable

Effusion of joint

M25.4 is the ICD-10-CM code for Effusion of joint. It is a non-billable category code — use a more specific child code such as M25.40 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M25
Subcodes
9
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Excludes1 — not coded here

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

Frequently asked questions

What is ICD-10 code M25.4?
M25.4 is the ICD-10-CM code for "Effusion of joint". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M25.4 a billable code?
No — M25.4 is a non-billable header code. Use a more specific child code (such as M25.40) for billing.
What are the subcodes of M25.4?
M25.4 has 9 more specific child codes, including M25.40, M25.41, M25.42.
What is excluded from M25.4?
Excludes1 (not coded here): hydrarthrosis in yaws (A66.6); intermittent hydrarthrosis (M12.4-); other infective (teno)synovitis (M65.1-).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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