M23.8 vs M24

M23.8 (Other internal derangements of knee) compared with M24 (Other specific joint derangements), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).

Can these codes be reported together?

Yes, when both are documented. M24 carries an Excludes2 note covering M23.8: “snapping knee (M23.8-)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

Side by side

	M23.8Other internal derangements of knee	M24Other specific joint derangements
Billing status	Non-billable header Report instead: M23.8X1, M23.8X2, M23.8X9	Non-billable header Report instead: M24.00, M24.011, M24.012, M24.019, M24.021
Classification	M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)	M00-M99 — Diseases of the Musculoskeletal System and Connective Tissue (M00-M99)
Definition	Other internal derangements of knee is a non-billable ICD-10-CM category code (M23.8).	Other specific joint derangements is a non-billable ICD-10-CM category code (M24).
Includes	Laxity of ligament of knee Snapping knee	—

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources