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M23Non-billableSave

M23 - Internal derangement of knee

ICD-10-CM Chapter 13: Diseases of the musculoskeletal system and connective tissue · M20-M25 Other joint disorders (M20-M25) · Top-level category · FY2027

Coding Guidance

M23 is a non-billable heading. Report one of the 8 more specific codes below.

Includes, Excludes and Coding Notes

Excludes 1 — Not Coded HereFrom M23

Mutually exclusive: these conditions are never reported together with this code.

  • ankylosis (M24.66)
  • deformity of knee (M21.-)
  • osteochondritis dissecans (M93.2)
Excludes 2 — Not Included HereFrom M23

Not part of this code; report both codes when the patient has both conditions.

  • 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)
Excludes 2 — Not Included HereFrom M20-M25 Other joint disorders (M20-M25)

Not part of this code; report both codes when the patient has both conditions.

  • joints of the spine (M40-M54)
Excludes 2 — Not Included HereFrom Chapter M00-M99

Not part of this code; report both codes when the patient has both conditions.

  • 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)
NotesFrom Chapter M00-M99

Instructional notes from the ICD-10-CM tabular list.

  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

More Specific Codes (8)

M23.0Cystic meniscus→M23.2Derangement of meniscus due to old tear or injury→M23.3Other meniscus derangements→M23.4Loose body in knee→M23.5Chronic instability of knee→M23.6Other spontaneous disruption of ligament(s) of knee→M23.8Other internal derangements of knee→M23.9Unspecified internal derangement of knee→

Related condition guides

Documentation requirements, coding pitfalls and FAQs for conditions coded with M23.