M12.421
ICD-10-CMThis code signifies a recurrent, non-inflammatory effusion into the right elbow joint, characterized by episodes of swelling and fluid accumulation that resolve spontaneously. It is a rare arthropathy where synovial fluid intermittently collects within the joint capsule without evidence of infection or systemic inflammatory disease.
Apply this code when documentation explicitly states intermittent hydrarthrosis affecting the right elbow. Supporting clinical notes should describe recurrent, self-limiting joint swelling without signs of acute inflammation (e.g., redness, warmth, significant pain out of proportion to swelling) or trauma.
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