Billable / Specific Code
ICD-10-CM M21.279 is the diagnosis code for Flexion deformity, unspecified ankle and toes. This code falls under the section "Other joint disorders" 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 M21.279 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M21.279 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M21.279 is the ICD-10-CM diagnosis code for "Flexion deformity, unspecified ankle and toes". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M21.279 is M21.27 ("Flexion deformity, ankle and toes"). M21.279 provides a more specific classification within this category.
M21.279 is located in Section M20-M25 — "Other joint disorders" within Chapter 13 of the ICD-10-CM Tabular List.
Use M21.279 when the patients documented diagnosis matches "Flexion deformity, unspecified ankle and toes" 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 Flexion deformity, unspecified ankle and toes is M21.279.
Yes, M21.279 can be used as a primary diagnosis code since it is billable and specific.
M21.279 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M21.279 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.