2024 ICD-10-CM Diagnosis Code Q66.90

Congenital deformity of feet, unspecified, unspecified foot

ICD-10-CM Code:
ICD-10 Code for:
Congenital deformity of feet, unspecified, unspecified foot
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Code Navigator:

Code Classification

  • Congenital malformations, deformations and chromosomal abnormalities
    • Congenital malformations and deformations of the musculoskeletal system
      • Congenital deformities of feet

Q66.90 is a billable diagnosis code used to specify a medical diagnosis of congenital deformity of feet, unspecified, unspecified foot. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024. The code is exempt from present on admission (POA) reporting for inpatient admissions to general acute care hospitals.

Unspecified diagnosis codes like Q66.90 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Congenital abnormal shape of rib
  • Congenital anomaly of foot
  • Congenital anomaly of toe
  • Congenital deformity of foot
  • Congenital deformity of foot and ankle
  • Congenital deformity of toe
  • Congenital pectus excavatum
  • Deformity of sternum
  • Finger hyperphalangy, toe anomalies, severe pectus excavatum syndrome
  • Hand-foot-genital syndrome
  • Hyperphalangy
  • Pectus deformity of chest
  • Pectus excavatum

Clinical Classification

Present on Admission (POA)

Q66.90 is exempt from POA reporting - The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement. Review other POA exempt codes here.

CMS POA Indicator Options and Definitions

POA IndicatorReason for CodeCMS will pay the CC/MCC DRG?
YDiagnosis was present at time of inpatient admission.YES
NDiagnosis was not present at time of inpatient admission.NO
UDocumentation insufficient to determine if the condition was present at the time of inpatient admission.NO
WClinically undetermined - unable to clinically determine whether the condition was present at the time of inpatient admission.YES
1Unreported/Not used - Exempt from POA reporting. NO

Replacement Code

Q6690 replaces the following previously assigned ICD-10-CM code(s):

  • Q66.9 - Congenital deformity of feet, unspecified

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020


[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.