Non-Billable / Non-Specific Code
ICD-10-CM Q66.3 is the diagnosis code for Other congenital varus deformities of feet. This code falls under the section "Congenital malformations and deformations of the musculoskeletal system" within Chapter 17 — Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where Q66.3 sits in the ICD-10-CM classification helps ensure proper coding:
No, Q66.3 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
Q66.3 is the ICD-10-CM diagnosis code for "Other congenital varus deformities of feet". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of Q66.3 is Q66 ("Congenital deformities of feet"). Q66.3 provides a more specific classification within this category.
Q66.3 is located in Section Q65-Q79 — "Congenital malformations and deformations of the musculoskeletal system" within Chapter 17 of the ICD-10-CM Tabular List.
Q66.3 has 3 sub-code(s) that provide more specific detail: Q66.30, Q66.31, Q66.32.
Use Q66.3 when the patients documented diagnosis matches "Other congenital varus deformities of feet" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Other congenital varus deformities of feet is Q66.3.
No, Q66.3 is non-billable. Use a more specific sub-code for primary diagnosis billing.
Q66.3 is in Chapter 17 of the ICD-10-CM Tabular List.
Yes, Q66.3 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.