M66.1
Header — not billableRupture of synovium
The ICD-10 code for rupture of synovium is M66.1.
M66.1 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 8 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.
- rupture of popliteal cyst (M66.0)
Also known as
Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.
- Rupture of synovial cyst
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 M66.1
- M66.10Rupture of synovium, unspecified joint
- M66.11Rupture of synovium, shouldernon-billable header
- M66.12Rupture of synovium, elbownon-billable header
- M66.13Rupture of synovium, wristnon-billable header
- M66.14Rupture of synovium, hand and fingersnon-billable header
- M66.15Rupture of synovium, hipnon-billable header
- M66.17Rupture of synovium, ankle, foot and toesnon-billable header
- M66.18Rupture of synovium, other site
Related codes in this category
- M66.0Rupture of popliteal cyst
- 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
- M66.1Rupture of synoviumnon-billable header