Billable / Specific Code
ICD-10-CM M66.261 is the diagnosis code for Spontaneous rupture of extensor tendons, right lower leg. This code falls under the section "Disorders of synovium and tendon" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where M66.261 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M66.261 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M66.261 is the ICD-10-CM diagnosis code for "Spontaneous rupture of extensor tendons, right lower leg". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M66.261 is M66.26 ("Spontaneous rupture of extensor tendons, lower leg"). M66.261 provides a more specific classification within this category.
M66.261 is located in Section M65-M67 — "Disorders of synovium and tendon" within Chapter 13 of the ICD-10-CM Tabular List.
Use M66.261 when the patients documented diagnosis matches "Spontaneous rupture of extensor tendons, right lower leg" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Spontaneous rupture of extensor tendons, right lower leg is M66.261.
Yes, M66.261 can be used as a primary diagnosis code since it is billable and specific.
M66.261 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M66.261 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.