Billable / Specific Code
ICD-10-CM M21.861 is the diagnosis code for Other specified acquired deformities of right lower leg. 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 M21.861 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M21.861 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M21.861 is the ICD-10-CM diagnosis code for "Other specified acquired deformities of 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 M21.861 is M21.86 ("Other specified acquired deformities of lower leg"). M21.861 provides a more specific classification within this category.
M21.861 is located in Section M20-M25 — "Other joint disorders" within Chapter 13 of the ICD-10-CM Tabular List.
Use M21.861 when the patients documented diagnosis matches "Other specified acquired deformities of 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 Other specified acquired deformities of right lower leg is M21.861.
Yes, M21.861 can be used as a primary diagnosis code since it is billable and specific.
M21.861 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M21.861 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.