M66.34
⚠ Non-billable (Header)Spontaneous rupture of flexor tendons, hand
Diseases of the musculoskeletal system and connective tissue (M00-M99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
⚠️ Excludes2
inheritedRules inherited from parent codes.
- • rotator cuff syndrome (M75.1-)
- • rupture where an abnormal force is applied to normal tissue - see injury of tendon by body region
Child Codes (3)
Clinical Description
ICD-10-CM code M66.34 represents spontaneous rupture of flexor tendons, hand. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 6-character code at the 5th level of specificity. There are 3 more specific child codes under M66.34.
Frequently Asked Questions
What is ICD-10 code M66.34?
ICD-10-CM code M66.34 is "Spontaneous rupture of flexor tendons, hand". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).
Is M66.34 a billable ICD-10 code?
No, M66.34 is a non-billable header code. A more specific child code must be used for billing.
Can M66.34 be coded with other codes?
M66.34 has 2 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.
Related Codes in M66.3
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)