Billable / Specific Code
ICD-10-CM M21.171 is the diagnosis code for Varus deformity, not elsewhere classified, right ankle. 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 M21.171 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M21.171 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M21.171 is the ICD-10-CM diagnosis code for "Varus deformity, not elsewhere classified, right ankle". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M21.171 is M21.17 ("Varus deformity, not elsewhere classified, ankle"). M21.171 provides a more specific classification within this category.
M21.171 is located in Section M20-M25 — "Other joint disorders" within Chapter 13 of the ICD-10-CM Tabular List.
Use M21.171 when the patients documented diagnosis matches "Varus deformity, not elsewhere classified, right ankle" 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 Varus deformity, not elsewhere classified, right ankle is M21.171.
Yes, M21.171 can be used as a primary diagnosis code since it is billable and specific.
M21.171 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M21.171 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.