M23.204 Derangement of unspecified medial meniscus due to old tear or injury, left knee

The ICD-10-CM code for Derangement of unspecified medial meniscus due to old tear or injury, left knee is M23.204 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

13: Diseases of the musculoskeletal system and connective tissue (M00-M99)

Section

M20-M25: Other joint disorders (M20-M25)

Category M23

148 codes (111 billable)

FY2026 Status

Stable since FY2024

U.S. Hospital Utilization

• An estimated 205 U.S. inpatient stays in 2023 included M23.204 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Osteoporosis without pathological fracture (M81)

Category M81, Osteoporosis without current pathological fracture, is for use for patients with osteoporosis who do not currently have a pathologic fracture due to the osteoporosis, even if they have had a fracture in the past. For patients with a history of osteoporosis fractures, status code Z87.310, Personal history of (healed) osteoporosis fracture, should follow the code from M81.

Osteoporosis with current pathological fracture (M80)

Category M80, Osteoporosis with current pathological fracture, is for patients who have a current pathologic fracture at the time of an encounter. The codes under M80 identify the site of the fracture. A code from category M80, not a traumatic fracture code, should be used for any patient with known osteoporosis who suffers a fracture, even if the patient had a minor fall or trauma, if that fall or trauma would not usually break a normal, healthy bone.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference M23.204 with the canonical source and edition:

M23.204 — Derangement of unspecified medial meniscus due to old tear or injury, left knee. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/M23.204

Canonical URL: https://icd10codingpro.com/codes/M23.204