ICD-10-CM M13 is the diagnosis code for Other arthritis. This code falls under the section "Inflammatory polyarthropathies" within Chapter 13 — Diseases of the musculoskeletal system and connective tissue (M00-M99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as M13. They are mutually exclusive:
Understanding where M13 sits in the ICD-10-CM classification helps ensure proper coding:
No, M13 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
M13 is the ICD-10-CM diagnosis code for "Other arthritis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
M13 is located in Section M05-M14 — "Inflammatory polyarthropathies" within Chapter 13 of the ICD-10-CM Tabular List.
M13 has 3 sub-code(s) that provide more specific detail: M13.0, M13.1, M13.8.
Use M13 when the patients documented diagnosis matches "Other arthritis" 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 arthritis is M13.
No, M13 is non-billable. Use a more specific sub-code for primary diagnosis billing.
M13 is in Chapter 13 of the ICD-10-CM Tabular List.
Type 1 Excludes for M13 include: arthrosis (M15-M19); osteoarthritis (M15-M19).
Yes, M13 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.