U.S. ICD-10-CM · FY 2027

M23 ICD-10-CM Code: Internal derangement of knee

A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.

Code definition

Official description

M23

Internal derangement of knee

ICD-10-CM diagnosis code · United States clinical modification

Classification

Where M23 sits

  1. 1

    Chapter 13

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

  2. 2

    Section

    Other joint disorders (M20-M25)

  3. 3

    Category M23

    Internal derangement of knee

  4. 4

    Code M23

    Internal derangement of knee

More specific choices

Codes under M23

M23 is a non-billable category. Choose the child code that best matches the documented diagnosis.

M23.0

Cystic meniscus

M23.2

Derangement of meniscus due to old tear or injury

M23.3

Other meniscus derangements

M23.4

Loose body in knee

M23.5

Chronic instability of knee

M23.6

Other spontaneous disruption of ligament(s) of knee

M23.8

Other internal derangements of knee

M23.9

Unspecified internal derangement of knee

Documentation details

Notes for this code

Inclusion terms

No inclusion terms are listed for M23.

Code first

No “code first” instruction is listed for M23.

Use additional code

No “use additional code” instruction is listed for M23.

Excludes1

Conditions that should not be reported together with this code.

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

Excludes2

Conditions not included here that may be reported separately when present.

  • 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)

Transparency

Source and release

Data release

U.S. ICD-10-CM · FY 2027

Effective date

Oct 1, 2026

Publisher

Vero Scribe Inc.

This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.

Review the CDC/NCHS ICD-10-CM source

Code-specific guidance

Frequently asked questions

What does ICD-10-CM code M23 mean?

M23 is the FY 2027 U.S. ICD-10-CM code for “Internal derangement of knee.”

Is M23 a billable or specific ICD-10-CM code?

No. M23 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.

Where is M23 located in ICD-10-CM?

M23 is listed in Chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99), within Other joint disorders (M20-M25) (M20–M25), under category M23, Internal derangement of knee.

What coding notes are listed for M23?

No inclusion terms are listed for M23 in this reference record. No code-first instruction is listed. Excludes1 notes: ankylosis (M24.66); deformity of knee (M21.-); osteochondritis dissecans (M93.2). Excludes2 notes: 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).

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