Billable / Specific Code
ICD-10-CM M05.879 is the diagnosis code for Other rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot. This code falls under the section "Inflammatory polyarthropathies" 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 M05.879 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, M05.879 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
M05.879 is the ICD-10-CM diagnosis code for "Other rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M05.879 is M05.87 ("Other rheumatoid arthritis with rheumatoid factor of ankle and foot"). M05.879 provides a more specific classification within this category.
M05.879 is located in Section M05-M14 — "Inflammatory polyarthropathies" within Chapter 13 of the ICD-10-CM Tabular List.
Use M05.879 when the patients documented diagnosis matches "Other rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot" 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 rheumatoid arthritis with rheumatoid factor of unspecified ankle and foot is M05.879.
Yes, M05.879 can be used as a primary diagnosis code since it is billable and specific.
M05.879 is in Chapter 13 of the ICD-10-CM Tabular List.
Yes, M05.879 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.