M13.1
Header — not billableMonoarthritis, not elsewhere classified
The ICD-10 code for monoarthritis, not elsewhere classified is M13.1.
M13.1 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 8 more specific codes below.
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.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Child codes under M13.1
- M13.10Monoarthritis, not elsewhere classified, unspecified site
- M13.11Monoarthritis, not elsewhere classified, shouldernon-billable header
- M13.12Monoarthritis, not elsewhere classified, elbownon-billable header
- M13.13Monoarthritis, not elsewhere classified, wristnon-billable header
- M13.14Monoarthritis, not elsewhere classified, handnon-billable header
- M13.15Monoarthritis, not elsewhere classified, hipnon-billable header
- M13.16Monoarthritis, not elsewhere classified, kneenon-billable header
- M13.17Monoarthritis, not elsewhere classified, ankle and footnon-billable header
Related codes in this category
- M13.0Polyarthritis, unspecified
- M13.8Other specified arthritisnon-billable header
- M13.1Monoarthritis, not elsewhere classifiednon-billable header