2027 ICD-10-CM Diagnosis Code Q66.6Other congenital valgus deformities of feet
ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q66
- Billable — Valid for Submission
- POA Exempt
- Chronic Condition
Q66.6 is a billable ICD-10-CM diagnosis code for other congenital valgus deformities of feet. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 564 through 566. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal congenital conditions.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q66.6 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations and deformations of the musculoskeletal system (Q65-Q79).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Bilateral congenital hallux valgus
- Bilateral congenital hallux valgus due to metatarsus primus varus
- Bilateral congenital metatarsus valgus
- Bilateral hallux valgus
- Bilateral talipes valgus of feet
- Congenital anomaly of macula
- Congenital coloboma of macula lutea
- Congenital forefoot valgus
- Congenital hallux valgus
- Congenital hallux valgus due to metatarsus primus varus
- Congenital hallux valgus of left great toe
- Congenital hallux valgus of right great toe
- Congenital metatarsus valgus
- Congenital rearfoot valgus
- Congenital valgus deformity of foot
- Hallux valgus of left foot
- Hallux valgus of right foot
- Left congenital hallux valgus due to metatarsus primus varus
- Macular coloboma, cleft palate, hallux valgus syndrome
- Right congenital hallux valgus due to metatarsus primus varus
- Severe intellectual disability, hypotonia, strabismus, coarse face, planovalgus syndrome
- Talipes equinovalgus
- Talipes equinus
- Talipes planovalgus
- Talipes valgus
- Talipes valgus of left foot
- Talipes valgus of right foot
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q66.6: its own notes plus those printed at Q66 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Congenital metatarsus valgus
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q66.6, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming Q66.6: they are not reported together with it, unless the two conditions are unrelated.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
foot (acquired) See Also: Deformity, limb, lower leg;
valgus (congenital) Q66.6
foot NEC See Also: Deformity, valgus, ankle;
congenital Q66.6
Metatarsus, metatarsal See Also: condition;
Pes (congenital) See Also: Talipes;
valgus Q66.6
equinovalgus Q66.6
planovalgus Q66.6
valgus Q66.6
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Birth Defects
A birth defect is a problem that happens while a baby is developing in the mother's body. Most birth defects happen during the first 3 months of pregnancy. One out of every 33 babies in the United States is born with a birth defect.
The full article covers:
- What are birth defects?
- What causes birth defects?
- Who is at risk of having a baby with birth defects?
- How are birth defects diagnosed?
- What are the treatments for birth defects?
- Can birth defects be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q66.6 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q66.6Overview
What is the ICD-10 code for other congenital valgus deformities of feet?
The ICD-10-CM code for other congenital valgus deformities of feet is Q66.6 (sometimes written as Q666). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q66.6 (Congenital deformities of feet) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other congenital valgus deformities of feet on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q66.6 group to?
When other congenital valgus deformities of feet is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 566, 565, with relative weights from 0.7374 to 1.4909 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q66.6 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for other congenital valgus deformities of feet on inpatient claims. The code appears in the Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) range of the CMS exempt list.
Can Q66.6 be reported with a code from Q72?
Not as a rule. The Excludes1 note at Q66, which applies to Q66.6, lists "reduction defects of feet (Q72.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
