M13.8

Header — not billable

Other specified arthritis

The ICD-10 code for other specified arthritis is M13.8.

M13.8 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 10 more specific codes below.

Clinical notes

Excludes1 (not coded here)

An Excludes1 note is a pure exclusion: the excluded condition and this code should never be reported together, because the two conditions cannot occur at the same time (e.g. a congenital form vs. an acquired form of the same disease).

osteoarthritis (M15-M19)

Also known as

Alternate wording, synonyms, or specific conditions that fall under this code, listed to help confirm you've picked the right one.

Allergic arthritis

Documentation support

General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.

•This is a non-billable header code. Documentation must support a more specific child code before this diagnosis can be reported on a claim.
•Confirm the excluded condition(s) listed above are not also present — Excludes1 conditions cannot be coded together with this one.
•As a general rule, code to the highest level of specificity supported by the documentation in the medical record.

Child codes under M13.8

Related codes in this category

M13.0Polyarthritis, unspecified
M13.1Monoarthritis, not elsewhere classifiednon-billable header
M13.8Other specified arthritisnon-billable header