M66 is the ICD-10 code for Spontaneous rupture of synovium and tendon. It is a three-character category divided into 6 subcodes; use the subcode whenever the record supports that level of detail. It belongs to the block M65–M68 (Disorders of synovium and tendon) in Chapter XIII, Diseases of the musculoskeletal system and connective tissue.
- Code type
- Category (3 characters)
- Chapter
- XIII · M00–M99
- Classification
- WHO ICD-10, 2019 version
What M66 includes
Conditions and terms that are coded here.
- rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
What M66 excludes
Conditions that look similar but belong under another code.
- rotator cuff syndrome M75.1
- rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Subcodes of M66
M66 in national editions
Countries report with their own edition of ICD-10. Most keep the WHO code and add more specific codes beneath it.
DM66Spontanruptur af ledkapselhinder og sener
M66Nivelkalvon tai jänteen spontaani repeytymä
M66Spontanruptur der Synovialis und von Sehnen
M66Déchirure spontanée de la synoviale et du tendon
M66spontane ruptuur van synovium en pees
Listed through more specific codes:
- M66.9Spontaneous rupture of unspecified tendon
Based on the World Health Organization’s International Statistical Classification of Diseases and Related Health Problems, 10th revision (ICD-10), 2019 version, and the national editions published by each country’s health authority. This page is a reference, not coding advice; follow your national coding rules when you report.
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