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ALL MEDICAL CODES IN CATEGORY M34.9 falls under the broader category of Systemic connective tissue disorders (M30-M36) within Chapter 13 (Diseases of the musculoskeletal system and connective tissue).

2025 ICD-10-CM code M34.9

Systemic sclerosis, unspecified; a chronic autoimmune disease causing excessive collagen production, leading to tissue hardening and thickening.