Alphabetic Index FY2027

M23.00

Cystic meniscus, unspecified meniscus

FY2027Chapter 13: Diseases of the musculoskeletal system and connective tissue/M20–M25 Other joint disorders

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

M23.00 is a non-billable ICD-10-CM code header for cystic meniscus, unspecified meniscus. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are M23.000 Cystic meniscus, unspecified lateral meniscus, right knee; M23.001 Cystic meniscus, unspecified lateral meniscus, left knee; M23.002 Cystic meniscus, unspecified lateral meniscus, unspecified knee; M23.003 Cystic meniscus, unspecified medial meniscus, right knee and 5 more. Its coding notes include 3 Excludes1 entries and 14 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

Inherited from M23 Internal derangement of knee

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from M23 Internal derangement of knee
  • 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)
Also from chapter/block level (11 notes)
Inherited from M20–M25 Other joint disorders
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • 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)

Inclusion terms

Conditions classified to this code.

This code
  • Cystic meniscus, unspecified lateral meniscus
  • Cystic meniscus, unspecified medial meniscus

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 13 Diseases of the musculoskeletal system and connective tissue
  • 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 under M23.00 9