M66.1

Non-billable

Rupture of synovium

M66.1 is the ICD-10-CM code for Rupture of synovium. It is a non-billable category code — use a more specific child code such as M66.10 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M66
Subcodes
8
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Includes

  • Rupture of synovial cyst

Excludes2 — not included here

  • rupture of popliteal cyst (M66.0)

Frequently asked questions

What is ICD-10 code M66.1?
M66.1 is the ICD-10-CM code for "Rupture of synovium". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M66.1 a billable code?
No — M66.1 is a non-billable header code. Use a more specific child code (such as M66.10) for billing.
What are the subcodes of M66.1?
M66.1 has 8 more specific child codes, including M66.10, M66.11, M66.12.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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