ICD-10-CM 2027 diagnosis code
M23.0Cystic meniscus
M23.0 is a header code, so it can't be reported by itself. Choose one of the 7 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About M23.0
M23.0 is the ICD-10-CM diagnosis code for cystic meniscus. It belongs to category M23 (internal derangement of knee), block M20-M25 (other joint disorders) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.
Within M23 (internal derangement of knee), M23.0 is specifically for cystic meniscus. Related codes cover derangement of meniscus due to old tear or injury (M23.2), other meniscus derangements (M23.3), Loose body in knee (M23.4), chronic instability of knee (M23.5), other spontaneous disruption of ligament(s) of knee (M23.6), other internal derangements of knee (M23.8) and unspecified internal derangement of knee (M23.9).
To report this condition, pick the subcode that matches the documentation: M23.00 (unspecified meniscus), M23.01 (anterior horn of medial meniscus), M23.02 (posterior horn of medial meniscus), M23.03 (other medial meniscus), M23.04 (anterior horn of lateral meniscus), M23.05 (posterior horn of lateral meniscus) and M23.06 (other lateral meniscus).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under M23.0
- M23.00Cystic meniscus, unspecified meniscus
- M23.000Cystic meniscus, unspecified lateral meniscus, right kneeBillable
- M23.001Cystic meniscus, unspecified lateral meniscus, left kneeBillable
- M23.002Cystic meniscus, unspecified lateral meniscus, unspecified kneeBillable
- M23.003Cystic meniscus, unspecified medial meniscus, right kneeBillable
- M23.004Cystic meniscus, unspecified medial meniscus, left kneeBillable
- M23.005Cystic meniscus, unspecified medial meniscus, unspecified kneeBillable
- M23.006Cystic meniscus, unspecified meniscus, right kneeBillable
- M23.007Cystic meniscus, unspecified meniscus, left kneeBillable
- M23.009Cystic meniscus, unspecified meniscus, unspecified kneeBillable
- M23.01Cystic meniscus, anterior horn of medial meniscus
- M23.02Cystic meniscus, posterior horn of medial meniscus
- M23.03Cystic meniscus, other medial meniscus
- M23.04Cystic meniscus, anterior horn of lateral meniscus
- M23.05Cystic meniscus, posterior horn of lateral meniscus
- M23.06Cystic meniscus, other lateral meniscus
Notes that apply from higher levels
Instructions written at a parent level also apply to M23.0.
Broader instructions also apply from M20-M25 Other joint disorders and Chapter 13: Diseases of the musculoskeletal system and connective tissue.
Alphabetic index entries
1 entriesTerms in the official ICD-10-CM index that lead to M23.0.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about M23.0
Is M23.0 billable?
- No. M23.0 is a header code. Report one of its more specific subcodes instead.