M24.66 is the authoritative medical code for Ankylosis, knee. This classification is used in medical billing and clinical recording to specify the clinical criteria for ankylosis, knee (ICD-10-CM M24.66), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.
Sequencing, inclusion, and exclusion notes published for M24.66 in the official ICD-10-CM tabular list.
Conditions that can never be reported with this code; the two are mutually exclusive.
Conditions not covered by this code, but which may be reported alongside it when both are present.
No. M24.66 (Ankylosis, knee) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.
Per official ICD-10-CM Excludes1 instructions, M24.66 must not be reported together with: stiffness of joint without ankylosis (M25.6-); current injury - see injury of joint by body region.
Per official ICD-10-CM Excludes2 instructions, M24.66 and the following are not considered part of each other and may both be reported when both conditions are present: spine (M43.2-); ganglion (M67.4); snapping knee (M23.8-); temporomandibular joint disorders (M26.6-).
Official ICD-10-CM classifications closest to M24.66 in its code family, with their registry titles.