Non-Billable / Non-Specific Code
ICD-10-CM M13.8 is the diagnosis code for Other specified 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 M13.8. They are mutually exclusive:
Understanding where M13.8 sits in the ICD-10-CM classification helps ensure proper coding:
No, M13.8 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
M13.8 is the ICD-10-CM diagnosis code for "Other specified arthritis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of M13.8 is M13 ("Other arthritis"). M13.8 provides a more specific classification within this category.
M13.8 is located in Section M05-M14 — "Inflammatory polyarthropathies" within Chapter 13 of the ICD-10-CM Tabular List.
M13.8 has 10 sub-code(s) that provide more specific detail: M13.80, M13.81, M13.82, M13.83, M13.84 and more.
Use M13.8 when the patients documented diagnosis matches "Other specified 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 specified arthritis is M13.8.
No, M13.8 is non-billable. Use a more specific sub-code for primary diagnosis billing.
M13.8 is in Chapter 13 of the ICD-10-CM Tabular List.
Type 1 Excludes for M13.8 include: osteoarthritis (M15-M19).
Yes, M13.8 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.