M23.00 – Cystic meniscus, unspecified meniscus
ICD-10-CM 2027 diagnosis code · Other joint disorders
ICD-10-CM code
M23.00
- Code
M23.00(claims format:M2300)- Description
- Cystic meniscus, unspecified meniscus
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
- Block
- M20-M25 Other joint disorders
- Parent codes
- M23 › M23.0
Billable codes under M23.00
M23.00 is a header code and cannot be used on claims. Choose the most specific code:
- M23.000 – Cystic meniscus, unspecified lateral meniscus, right kneeBillable
- M23.001 – Cystic meniscus, unspecified lateral meniscus, left kneeBillable
- M23.002 – Cystic meniscus, unspecified lateral meniscus, unspecified kneeBillable
- M23.003 – Cystic meniscus, unspecified medial meniscus, right kneeBillable
- M23.004 – Cystic meniscus, unspecified medial meniscus, left kneeBillable
- M23.005 – Cystic meniscus, unspecified medial meniscus, unspecified kneeBillable
- M23.006 – Cystic meniscus, unspecified meniscus, right kneeBillable
- M23.007 – Cystic meniscus, unspecified meniscus, left kneeBillable
- M23.009 – Cystic meniscus, unspecified meniscus, unspecified kneeBillable
Notes for M23.00
Applicable to:
- Cystic meniscus, unspecified lateral meniscus
- Cystic meniscus, unspecified medial meniscus
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
M23 – Internal derangement of knee
Excludes1 (not coded here):
Excludes2 (not included here):
Block M20-M25
Related codes in M23.0
- M23.01 – Cystic meniscus, anterior horn of medial meniscusHeader
- M23.02 – Cystic meniscus, posterior horn of medial meniscusHeader
- M23.03 – Cystic meniscus, other medial meniscusHeader
- M23.04 – Cystic meniscus, anterior horn of lateral meniscusHeader
- M23.05 – Cystic meniscus, posterior horn of lateral meniscusHeader
- M23.06 – Cystic meniscus, other lateral meniscusHeader
Frequently asked questions
What is ICD-10 code M23.00?
M23.00 is the ICD-10-CM code for cystic meniscus, unspecified meniscus, in the block M20-M25 (Other joint disorders).
Is M23.00 a billable code?
No. M23.00 is a header code with more specific child codes; report one of the billable codes listed above.
What category does M23.00 belong to?
It belongs to category M23 – Internal derangement of knee.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.