Coding and coverage · ICD-10-CM

M23 › M23.2

M23.21 Derangement of anterior horn of medial meniscus due to old tear or injury

Not billable (header)Chapter 13

Report one of the more specific codes below.

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Codes under this one

  • M23.211 Derangement of anterior horn of medial meniscus due to old tear or injury, right knee
  • M23.212 Derangement of anterior horn of medial meniscus due to old tear or injury, left knee
  • M23.219 Derangement of anterior horn of medial meniscus due to old tear or injury, unspecified knee

Instructional notes

Chapter 13

Excludes2Not included here: the patient may have both; report both when both are present.
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Section M00-M25

Includes
  • Disorders affecting predominantly peripheral (limb) joints

M23

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
Excludes2Not included here: the patient may have both; report both when both are 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)

M23.2

Inclusion terms
  • Old bucket-handle tear

Chapter 13: Diseases of the musculoskeletal system and connective tissue · M00-M25 Arthropathies (M00-M25)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.