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ICD-10-CM 2027 diagnosis code

M23.201Derangement of unspecified lateral meniscus due to old tear or injury, left knee

✓ Billable / specific

M23.201 is a valid, billable ICD-10-CM code for derangement of unspecified lateral meniscus due to old tear or injury, left knee. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Derangement of unsp lat mensc due to old tear/inj, left knee

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 M23.201

M23.201 is the ICD-10-CM diagnosis code for derangement of unspecified lateral meniscus due to old tear or injury, left knee. 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within M23.20 (derangement of unspecified meniscus due to old tear or injury), M23.201 is specifically for derangement of unspecified lateral meniscus due to old tear or injury, left knee. Related codes cover lateral meniscus due to old tear or injury, right knee (M23.200), lateral meniscus due to old tear or injury, unspecified knee (M23.202), medial meniscus due to old tear or injury, right knee (M23.203), medial meniscus due to old tear or injury, left knee (M23.204), medial meniscus due to old tear or injury, unspecified knee (M23.205), right knee (M23.206), left knee (M23.207) and unspecified knee (M23.209).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC, relative weight 1.398) and DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC, relative weight 0.8985), in MDC 08 (Diseases and Disorders of the Musculoskeletal System and Connective Tissue), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 717.40 (derangement of lateral meniscus, unspecified).

Notes that apply from higher levels

Instructions written at a parent level also apply to M23.201.

› From M23 Internal derangement of knee
Excludes1
  • ankylosis (M24.66)
  • deformity of knee (M21.-)
  • osteochondritis dissecans (M93.2)
Excludes2
  • 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)

Broader instructions also apply from M20-M25 Other joint disorders and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 717.40Derangement of lateral meniscus, unspecifiedapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M23.201

Is M23.201 billable?

Yes. M23.201 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can M23.201 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict M23.201 as a principal diagnosis.

Is M23.201 a CC or MCC?

No. M23.201 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does M23.201 group to?

M23.201 is used in the MS-DRG v44.0 logic for MS-DRG 562 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh with MCC) and MS-DRG 563 (Fracture, Sprain, Strain and Dislocation Except Femur, Hip, Pelvis and Thigh without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for M23.201?

The CMS General Equivalence Mappings map M23.201 to ICD-9-CM 717.40.