ICD-10 Code for Knock knee
Also indexed as (acquired)
The ICD-10-CM code for knock knee is M21.06 — Valgus deformity, not elsewhere classified, knee. This is the code the Alphabetic Index gives for knock knee with no further qualifier, valid for FY2027 (October 1, 2026 – September 30, 2027).
M21.06 cannot be submitted on a claim. It is a header code, so a more specific code from the list below is required.
Which knock knee code should you use?
The Alphabetic Index lists 2 codes under Knock knee. Which one applies depends on the qualifier documented in the record — the type, site, cause, or associated condition. Find the qualifier below, then verify the code in the Tabular List before using it.
By type
| congenital | Q74.1 | Congenital malformation of knee |
Codes under M21.06
Index terms and codes are reproduced from the official ICD-10-CM FY2027 release. The Alphabetic Index is a finding aid — a code must always be verified in the Tabular List before it is reported. Data sources