All ICD10 Codes

M23.9

Non-Billable
ChapterM00–M99
Ranksubcategory
Official Description

Unspecified internal derangement of knee

Use a more specific code (3 billable)
M23.90Unspecified internal derangement of unspecified kneeM23.91Unspecified internal derangement of right kneeM23.92Unspecified internal derangement of left knee
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 13: Diseases of the Musculoskeletal System and Connective Tissue (M00-M99).
General instructions are available for the parent sections:
View CH13 NotesView M20-M25 NotesView M23 Notes

Clinical Hierarchy

BillableHas subcodes
CH13Diseases of the musculoskeletal system and connective tissue (M00-M99)
M20-M25Other joint disorders (M20-M25)
M23Internal derangement of knee
M23.9Unspecified internal derangement of kneeNot billable
M23.90Unspecified internal derangement of unspecified kneeBillable
M23.91Unspecified internal derangement of right kneeBillable
M23.92Unspecified internal derangement of left kneeBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to M23.9:

categoryM23
Internal derangement of knee
View context instructions
blockM20-M25
Other joint disorders (M20-M25)
View context instructions
chapterCH13
Diseases of the musculoskeletal system and connective tissue (M00-M99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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