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M66.31

Non-billable

Spontaneous rupture of flexor tendons, shoulder

M66.31 is the ICD-10-CM code for Spontaneous rupture of flexor tendons, shoulder. It is a non-billable category code — use a more specific child code such as M66.311 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M66.3
Subcodes
3
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

No additional coding notes for this code.

Frequently asked questions

What is ICD-10 code M66.31?
M66.31 is the ICD-10-CM code for "Spontaneous rupture of flexor tendons, shoulder". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M66.31 a billable code?
No — M66.31 is a non-billable header code. Use a more specific child code (such as M66.311) for billing.
What are the subcodes of M66.31?
M66.31 has 3 more specific child codes, including M66.311, M66.312, M66.319.

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

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