M23.23

⚠ Non-billable (Header)

Derangement of other medial meniscus due to old tear or injury

Diseases of the musculoskeletal system and connective tissue (M00-M99)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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❌ Excludes1

inherited

Rules inherited from parent codes in the hierarchy.

M23

• ankylosis (M24.66)
• deformity of knee (M21.-)
• osteochondritis dissecans (M93.2)

⚠️ Excludes2

inherited

Rules inherited from parent codes.

M23

• current injury - see injury of knee and lower leg (S80-S89)
• recurrent dislocation or subluxation of joints (M24.4)
• recurrent dislocation or subluxation of patella (M22.0-M22.1)

Child Codes (3)

M23.231Derangement of other medial meniscus due to old tear or injury, right knee✓ Billable M23.232Derangement of other medial meniscus due to old tear or injury, left knee✓ Billable M23.239Derangement of other medial meniscus due to old tear or injury, unspecified knee✓ Billable

Clinical Description

ICD-10-CM code M23.23 represents derangement of other medial meniscus due to old tear or injury. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 6-character code at the 5th level of specificity. There are 3 more specific child codes under M23.23. Coders should note that M23.23 has 3 Excludes1 restriction(s) — codes that cannot be reported together on the same claim.

Frequently Asked Questions

What is ICD-10 code M23.23?

ICD-10-CM code M23.23 is "Derangement of other medial meniscus due to old tear or injury". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).

Is M23.23 a billable ICD-10 code?

No, M23.23 is a non-billable header code. A more specific child code must be used for billing.

What codes are excluded with M23.23?

M23.23 has 3 Excludes1 rule(s). These codes are mutually exclusive and cannot be coded together on the same claim.

Can M23.23 be coded with other codes?

M23.23 has 3 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in M23.2

Other codes in the same category that may be relevant for differential coding:

M23.20Derangement of unspecified meniscus due to old tear or injury M23.21Derangement of anterior horn of medial meniscus due to old tear or injury M23.22Derangement of posterior horn of medial meniscus due to old tear or injury M23.24Derangement of anterior horn of lateral meniscus due to old tear or injury M23.25Derangement of posterior horn of lateral meniscus due to old tear or injury M23.26Derangement of other lateral meniscus due to old tear or injury

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Code Information

CodeM23.23

BillableNo — Header code

ParentM23.2

CategoryDiseases of the musculoskeletal system and connective tissue (M00-M99)

Excludes13 rule(s)

Excludes23 note(s)

Child codes3

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)