M66
Header — not billableSpontaneous rupture of synovium and tendon
The ICD-10 code for spontaneous rupture of synovium and tendon is M66.
M66 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 6 more specific codes below.
Clinical notes
Excludes2 (not included here)
An Excludes2 note means the excluded condition is not part of this one, but a patient can have both at the same time — in that case both codes may be reported together.
- rotator cuff syndrome (M75.1-)
- rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Includes
Terms listed here further define or give examples of the conditions grouped under this code — they describe what the code covers, not a separate diagnosis.
- rupture that occurs when a normal force is applied to tissues that are inferred to have less than normal strength
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under M66
- M66.0Rupture of popliteal cyst
- M66.1Rupture of synoviumnon-billable header
- M66.2Spontaneous rupture of extensor tendonsnon-billable header
- M66.3Spontaneous rupture of flexor tendonsnon-billable header
- M66.8Spontaneous rupture of other tendonsnon-billable header
- M66.9Spontaneous rupture of unspecified tendon
Related codes in this category
- M65Synovitis and tenosynovitisnon-billable header
- M67Other disorders of synovium and tendonnon-billable header
- M66Spontaneous rupture of synovium and tendonnon-billable header