2026 ICD-10-CM Diagnosis Code M23.342Other meniscus derangements, anterior horn of lateral meniscus, left knee

ICD-10-CM Codes›M00–M99›M20-M25›M23

ICD-10-CM M23.342
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M23.342 is a billable ICD-10-CM diagnosis code for other meniscus derangements, anterior horn of lateral meniscus, left knee. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 562 through 563. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified joint disorders.

Code Identity

ICD-10-CM Code
M23.342
Billable Status
Yes — Valid for Submission
Code Describes
Other meniscus derangements, anterior horn of lateral meniscus, left knee
Short Description
Oth meniscus derang, anterior horn of lat mensc, left knee
Parent Code
M23.34
Other meniscus derangements, anterior horn of lateral meniscus

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM20-M25Other joint disorders
CategoryM23Internal derangement of knee
This CodeM23.342Other meniscus derangements, anterior horn of lateral meniscus, left knee

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral derangement of knee
  • Bilateral derangement of meniscus of knee joints
  • Chronic derangement of anterior horn of lateral meniscus
  • Chronic derangement of anterior horn of lateral meniscus of bilateral knees
  • Chronic derangement of anterior horn of lateral meniscus of left knee
  • Chronic derangement of anterior horn of lateral meniscus of right knee
  • Derangement of anterior horn of lateral meniscus
  • Derangement of anterior horn of lateral meniscus of bilateral knees
  • Derangement of anterior horn of lateral meniscus of left knee
  • Derangement of anterior horn of lateral meniscus of right knee
  • Derangement of lateral meniscus of left knee
  • Derangement of lateral meniscus of right knee

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS007
Other specified joint disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Knee Injuries and Disorders

Your knee joint is made up of bone, cartilage, ligaments and fluid. Muscles and tendons help the knee joint move. When any of these structures is hurt or diseased, you have knee problems. Knee problems can cause pain and difficulty walking.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert M23.342 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
717.42 Derange ant lat meniscus
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M23.342Overview

Is M23.342 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other meniscus derangements, anterior horn of lateral meniscus, left knee on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M23.342 group to?

When other meniscus derangements, anterior horn of lateral meniscus, left knee is the principal diagnosis on an inpatient stay, it groups to MS-DRG 562, 563, with relative weights from 0.8955 to 1.4248 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M23.342?

Under the General Equivalence Mappings, other meniscus derangements, anterior horn of lateral meniscus, left knee converts to ICD-9-CM 717.42 (derange ant lat meniscus). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.