M66.30
✓ BillableSpontaneous rupture of flexor tendons, unspecified site
Diseases of the musculoskeletal system and connective tissue (M00-M99)
⚠️ 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
Clinical Description
ICD-10-CM code M66.30 represents spontaneous rupture of flexor tendons, unspecified site. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a billable/specific code valid for HIPAA-covered transactions as of October 1, 2025 (FY2026). This code can be used to indicate a diagnosis for reimbursement purposes on insurance claims.
This is a 6-character code at the 5th level of specificity. This is the most specific code available in this subcategory.
Frequently Asked Questions
What is ICD-10 code M66.30?
ICD-10-CM code M66.30 is "Spontaneous rupture of flexor tendons, unspecified site". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).
Is M66.30 a billable ICD-10 code?
Yes, M66.30 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
Can M66.30 be coded with other codes?
M66.30 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)