Other specified systemic involvement of connective tissue
Other specified systemic involvement of connective tissue
M35.8 is a header (parent) code in the ICD-10-CM hierarchy. It is not billable for claim submission. Use one of the billable child codes listed below.
Billable codes in this category
Each of the codes below is billable. Choose the one that most accurately describes the patient's diagnosis.
M35.81 classifies multisystem inflammatory syndrome (MIS) — a serious, hyperinflammatory condition affecting multiple organ systems, seen in both children (MIS-C) and adults (MIS-A), and strongly associated with prior SARS-CoV-2 infection.
M35.89 captures systemic connective tissue disorders that are definitively diagnosed but do not fit any more specific code in the M30–M36 range — a true 'other specified' bucket for conditions such as eosinophilia-myalgia syndrome and collagen vascular disease NOS.