All ICD10 Codes

M23

Non-Billable
ChapterM00–M99
Rankcategory
Official Description

Internal derangement of knee

Use a more specific code (0 billable, 8 non-billable)
M23.0Cystic meniscushas subcodesM23.2Derangement of meniscus due to old tear or injuryhas subcodesM23.3Other meniscus derangementshas subcodesM23.4Loose body in kneehas subcodesM23.5Chronic instability of kneehas subcodesM23.6Other spontaneous disruption of ligament(s) of kneehas subcodesM23.8Other internal derangements of kneehas subcodesM23.9Unspecified internal derangement of kneehas subcodes
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).

CH13 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

M20-M25 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

Instructional Notes

Excludes1(Not coded here. Use a different code.)
  • ankylosis (M24.66)
  • deformity of knee (M21.-)
  • osteochondritis dissecans (M93.2)
Excludes2(Not included here. Code separately if applicable.)
  • 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)

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M20-M25Other joint disorders (M20-M25)
M23Internal derangement of kneeNot billable
M23.0Cystic meniscusSubcodes
M23.2Derangement of meniscus due to old tear or injurySubcodes
M23.3Other meniscus derangementsSubcodes
M23.4Loose body in kneeSubcodes
M23.5Chronic instability of kneeSubcodes
M23.6Other spontaneous disruption of ligament(s) of kneeSubcodes
M23.8Other internal derangements of kneeSubcodes
M23.9Unspecified internal derangement of kneeSubcodes

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M23:

blockM20-M25
Other joint disorders (M20-M25)
View context instructions
chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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