M23.21
Header — not billableDerangement of anterior horn of medial meniscus due to old tear or injury
The ICD-10 code for derangement of anterior horn of medial meniscus due to old tear or injury is M23.21.
M23.21 is a non-billable header code. It groups related conditions but cannot be used on its own for reimbursement — select one of the 3 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 M23.21
Related codes in this category
- M23.20Derangement of unspecified meniscus due to old tear or injurynon-billable header
- M23.22Derangement of posterior horn of medial meniscus due to old tear or injurynon-billable header
- M23.23Derangement of other medial meniscus due to old tear or injurynon-billable header
- M23.24Derangement of anterior horn of lateral meniscus due to old tear or injurynon-billable header
- M23.25Derangement of posterior horn of lateral meniscus due to old tear or injurynon-billable header
- M23.26Derangement of other lateral meniscus due to old tear or injurynon-billable header
- M23.21Derangement of anterior horn of medial meniscus due to old tear or injurynon-billable header