M35 is a non-billable/non-specific diagnosis code from the 2026 ICD-10-CM used to classify the following condition: Other systemic involvement of connective tissue.
Reactive perforating collagenosis (L87.1)
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Sjögren syndrome
Other overlap syndromes
Behçet's disease
Polymyalgia rheumatica
Diffuse (eosinophilic) fasciitis
Multifocal fibrosclerosis
Relapsing panniculitis [Weber-Christian]
Hypermobility syndrome
Other specified systemic involvement of connective tissue
Systemic involvement of connective tissue, unspecified
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