M25.40 Effusion, unspecified joint

Billable ICD-10-CM code, FY2026.

Applies from M25 Other joint disorder, not elsewhere classified

Excludes2 (not included here)

• 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-)

Applies from M25.4 Effusion of joint

Excludes1 (never code together)

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

MS-DRG index

Defines the logic of DRG(s) 564-566 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 719.00 Effusion of joint, site unspecified (approximate)

Code annotations containing back-references to M25.40

Back-references to M25.4

• Type 1 Excludes: R22 Localized swelling, mass and lump of skin and subcutaneous tissue ("swelling of joint (M25.4-)")

Diagnosis Index entries for M25.40

• Effusion › joint

Nearby codes

• M25.374 Other instability, right foot
• M25.375 Other instability, left foot
• M25.376 Other instability, unspecified foot
• M25.39 Other instability, other specified joint
• M25.4 Effusion of joint
• M25.40 Effusion, unspecified joint (this code)
• M25.41 Effusion, shoulder
• M25.411 Effusion, right shoulder
• M25.412 Effusion, left shoulder
• M25.419 Effusion, unspecified shoulder
• M25.42 Effusion, elbow