Non-Billable / Non-Specific Code
ICD-10-CM Q66 is the diagnosis code for Congenital 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.
The following conditions should never be coded at the same time as Q66. They are mutually exclusive:
Understanding where Q66 sits in the ICD-10-CM classification helps ensure proper coding:
No, Q66 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
Q66 is the ICD-10-CM diagnosis code for "Congenital deformities of feet". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
Q66 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 has 10 sub-code(s) that provide more specific detail: Q66.0, Q66.1, Q66.2, Q66.3, Q66.4 and more.
Use Q66 when the patients documented diagnosis matches "Congenital 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 Congenital deformities of feet is Q66.
No, Q66 is non-billable. Use a more specific sub-code for primary diagnosis billing.
Q66 is in Chapter 17 of the ICD-10-CM Tabular List.
Type 1 Excludes for Q66 include: reduction defects of feet (Q72.-); valgus deformities (acquired) (M21.0-); varus deformities (acquired) (M21.1-).
Yes, Q66 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.