2026 ICD-10-CM Diagnosis Code Q66.89Other specified congenital deformities of feet

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q66

ICD-10-CM Q66.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q66.89 is a billable ICD-10-CM diagnosis code for other specified congenital deformities of feet. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) 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

ICD-10-CM Code
Q66.89
Billable Status
Yes — Valid for Submission
Code Describes
Other specified congenital deformities of feet
Short Description
Other specified congenital deformities of feet
Same as the full description in the CMS dataset.
Parent Code
Q66.8
Other congenital deformities of feet

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ66Congenital deformities of feet
This CodeQ66.89Other specified congenital deformities of feet

Present on Admission (POA)Billing

Q66.89 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Ablepharon
  • Abnormal tapering of distal metatarsal
  • Abnormal tapering of phalanx of foot
  • Abnormally short distal phalanx of fifth toe
  • Abnormally short distal phalanx of foot
  • Abnormally short distal phalanx of fourth toe
  • Abnormally short distal phalanx of great toe
  • Abnormally short distal phalanx of second toe
  • Abnormally short distal phalanx of third toe
  • Abnormally short fifth metatarsal
  • Abnormally short fifth toe
  • Abnormally short fourth metatarsal
  • Abnormally short fourth toe
  • Abnormally short great toe
  • Abnormally short middle phalanx of fifth toe
  • Abnormally short middle phalanx of fourth toe
  • Abnormally short middle phalanx of lesser toe
  • Abnormally short middle phalanx of second toe
  • Abnormally short middle phalanx of third toe
  • Abnormally short phalanx of fifth toe
  • Abnormally short phalanx of fourth toe
  • Abnormally short phalanx of great toe
  • Abnormally short phalanx of second toe
  • Abnormally short phalanx of third toe
  • Abnormally short phalanx of thumb
  • Abnormally short proximal phalanx of fifth toe
  • Abnormally short proximal phalanx of foot
  • Abnormally short proximal phalanx of fourth toe
  • Abnormally short proximal phalanx of great toe
  • Abnormally short proximal phalanx of second toe
  • Abnormally short proximal phalanx of third toe
  • Abnormally short proximal phalanx of thumb
  • Abnormally short second metatarsal
  • Abnormally short second toe
  • Abnormally short third metatarsal
  • Abnormally short third toe
  • Absence of eyelashes
  • Accessory cuboid bone
  • Accessory left tarsal navicular bone
  • Accessory navicular bone of foot
  • Accessory right tarsal navicular bone
  • Accessory tarsal bone of bilateral feet
  • Accessory tarsal bone of left foot
  • Accessory tarsal bone of right foot
  • Ankylosis of metatarsophalangeal joint
  • Aphonia, deafness, retinal dystrophy, bifid halluces, intellectual disability syndrome
  • Astragaloscaphoid synostosis
  • Asymmetric talipes
  • Bean-shaped foot
  • Bilateral accessory navicular bones
  • Bilateral brachydactyly of finger of hands
  • Bilateral brachydactyly of toes
  • Bilateral congenital deformity of hands
  • Bilateral congenital hammer toes
  • Bilateral congenital lower limb hypertrophy
  • Bilateral congenital overriding toes of feet
  • Bilateral flexion deformity of feet
  • Bilateral foot congenital pes cavus
  • Bilateral macrodactyly of toes
  • Bilateral syndactyly of toes
  • Bilateral talipes
  • Bilateral tarsal coalitions of feet
  • Bipartite talus
  • Brachydactyly and preaxial hallux varus syndrome
  • Brachydactyly of finger of left hand
  • Brachydactyly of finger of right hand
  • Brachydactyly of toes
  • Brachydactyly of toes of left foot
  • Brachydactyly of toes of right foot
  • Brachymegalodactyly
  • Brachymetatarsia
  • Brachymetatarsia of first metatarsal
  • Brachymetatarsia of fourth metatarsal
  • Brachyphalangia of little toe
  • Brachyphalangia of toe
  • Calcaneonavicular bar
  • Cleft mandible
  • Clinodactyly of toe
  • Complex tarsal coalition
  • Congenital abnormal broad shape of distal phalanx of fifth toe
  • Congenital abnormal broad shape of distal phalanx of foot
  • Congenital abnormal broad shape of distal phalanx of fourth toe
  • Congenital abnormal broad shape of distal phalanx of great toe
  • Congenital abnormal broad shape of distal phalanx of second toe
  • Congenital abnormal broad shape of distal phalanx of third toe
  • Congenital abnormal broad shape of middle phalanx of fifth toe
  • Congenital abnormal broad shape of middle phalanx of foot
  • Congenital abnormal broad shape of middle phalanx of fourth toe
  • Congenital abnormal broad shape of middle phalanx of second toe
  • Congenital abnormal broad shape of middle phalanx of third toe
  • Congenital abnormal broad shape of phalanx of fifth toe
  • Congenital abnormal broad shape of phalanx of foot
  • Congenital abnormal broad shape of phalanx of fourth toe
  • Congenital abnormal broad shape of phalanx of great toe
  • Congenital abnormal broad shape of phalanx of second toe
  • Congenital abnormal broad shape of phalanx of third toe
  • Congenital abnormal broad shape of proximal phalanx of fifth toe
  • Congenital abnormal broad shape of proximal phalanx of foot
  • Congenital abnormal broad shape of proximal phalanx of fourth toe
  • Congenital abnormal broad shape of proximal phalanx of great toe
  • Congenital abnormal broad shape of proximal phalanx of second toe
  • Congenital abnormal broad shape of proximal phalanx of third toe
  • Congenital abnormal bullet shape of distal phalanx of foot
  • Congenital abnormal bullet shape of distal phalanx of fourth toe
  • Congenital abnormal bullet shape of distal phalanx of great toe
  • Congenital abnormal bullet shape of distal phalanx of little toe
  • Congenital abnormal bullet shape of distal phalanx of second toe
  • Congenital abnormal bullet shape of distal phalanx of third toe
  • Congenital abnormal bullet shape of middle phalanx of fifth toe
  • Congenital abnormal bullet shape of middle phalanx of foot
  • Congenital abnormal bullet shape of middle phalanx of fourth toe
  • Congenital abnormal bullet shape of middle phalanx of second toe
  • Congenital abnormal bullet shape of middle phalanx of third toe
  • Congenital abnormal bullet shape of phalanx of fifth toe
  • Congenital abnormal bullet shape of phalanx of foot
  • Congenital abnormal bullet shape of phalanx of fourth toe
  • Congenital abnormal bullet shape of phalanx of great toe
  • Congenital abnormal bullet shape of phalanx of second toe
  • Congenital abnormal bullet shape of phalanx of third toe
  • Congenital abnormal bullet shape of proximal phalanx of fifth toe
  • Congenital abnormal bullet shape of proximal phalanx of foot
  • Congenital abnormal bullet shape of proximal phalanx of fourth toe
  • Congenital abnormal bullet shape of proximal phalanx of great toe
  • Congenital abnormal bullet shape of proximal phalanx of second toe
  • Congenital abnormal bullet shape of proximal phalanx of third toe
  • Congenital abnormal cone shape of epiphysis of phalanx of fifth toe
  • Congenital abnormal cone shape of epiphysis of phalanx of fourth toe
  • Congenital abnormal cone shape of epiphysis of phalanx of great toe
  • Congenital abnormal cone shape of epiphysis of phalanx of second toe
  • Congenital abnormal cone shape of epiphysis of phalanx of third toe
  • Congenital abnormal cone shape of epiphysis of phalanx of toe
  • Congenital abnormal fusion of bones of foot
  • Congenital abnormal fusion of calcaneus
  • Congenital abnormal fusion of first metatarsal bone
  • Congenital abnormal fusion of metatarsal bone
  • Congenital abnormal fusion of talus
  • Congenital abnormal fusion of tarsal bone
  • Congenital abnormal shape of calcaneus
  • Congenital abnormal shape of metatarsal bone
  • Congenital abnormal shape of talus
  • Congenital abnormal shape of tarsal bone
  • Congenital abnormal triangular shape of distal phalanx of fifth toe
  • Congenital abnormal triangular shape of distal phalanx of foot
  • Congenital abnormal triangular shape of distal phalanx of great toe
  • Congenital abnormal triangular shape of distal phalanx of second toe
  • Congenital abnormal triangular shape of epiphysis of phalanx of fifth toe
  • Congenital abnormal triangular shape of epiphysis of phalanx of fourth toe
  • Congenital abnormal triangular shape of epiphysis of phalanx of great toe
  • Congenital abnormal triangular shape of epiphysis of phalanx of second toe
  • Congenital abnormal triangular shape of epiphysis of phalanx of third toe
  • Congenital abnormal triangular shape of epiphysis of phalanx of toe
  • Congenital abnormal triangular shape of middle phalanx of foot
  • Congenital abnormal triangular shape of middle phalanx of second toe
  • Congenital abnormal triangular shape of phalanx of fifth toe
  • Congenital abnormal triangular shape of phalanx of fourth toe
  • Congenital abnormal triangular shape of phalanx of great toe
  • Congenital abnormal triangular shape of phalanx of second toe
  • Congenital abnormal triangular shape of phalanx of third toe
  • Congenital abnormal triangular shape of phalanx of toe
  • Congenital abnormal triangular shape of proximal phalanx of foot
  • Congenital abnormal triangular shape of proximal phalanx of great toe
  • Congenital abnormal triangular shape of proximal phalanx of second toe
  • Congenital absence of eyelash
  • Congenital ankylosis of interphalangeal joint of great toe
  • Congenital ankylosis of interphalangeal joint of toe
  • Congenital ankylosis of metatarsophalangeal joint of fifth toe
  • Congenital ankylosis of proximal interphalangeal joint of fifth toe
  • Congenital ankylosis of proximal interphalangeal joint of fourth toe
  • Congenital ankylosis of proximal interphalangeal joint of second toe
  • Congenital ankylosis of proximal interphalangeal joint of third toe
  • Congenital anomaly of calcaneus
  • Congenital anomaly of metatarsal bone
  • Congenital anomaly of talus
  • Congenital anomaly of tarsal bone
  • Congenital claw foot
  • Congenital claw toe
  • Congenital claw toe of bilateral feet
  • Congenital claw toe of left foot
  • Congenital claw toe of right foot
  • Congenital clinodactyly
  • Congenital clinodactyly of fifth toe
  • Congenital clinodactyly of finger
  • Congenital clinodactyly of fourth toe
  • Congenital clinodactyly of great toe
  • Congenital clinodactyly of little finger
  • Congenital clinodactyly of second toe
  • Congenital clinodactyly of third toe
  • Congenital contracture of toe joint
  • Congenital contracture of toe joint of bilateral feet
  • Congenital contracture of toe joint of left foot
  • Congenital contracture of toe joint of right foot
  • Congenital crossed toes
  • Congenital curly toes
  • Congenital deformity of left hand
  • Congenital deformity of right hand
  • Congenital enlarged nails
  • Congenital flexion contracture of foot joint
  • Congenital hallux varus
  • Congenital hammer toe
  • Congenital hammer toe of left foot
  • Congenital hammer toe of right foot
  • Congenital hypertrophy of lateral fold of hallux
  • Congenital hypoplasia of calcaneus
  • Congenital hypoplasia of metatarsal bone
  • Congenital hypoplasia of talus
  • Congenital hypoplasia of tarsal bone
  • Congenital mallet toe
  • Congenital malposition of calcaneus
  • Congenital malposition of metatarsal bone
  • Congenital malposition of talus
  • Congenital malposition of tarsal bone
  • Congenital overgrowth of foot
  • Congenital overriding toes of left foot
  • Congenital overriding toes of right foot
  • Congenital pes cavus
  • Congenital pes cavus of left foot
  • Congenital pes cavus of right foot
  • Congenital positional talipes
  • Congenital short Achilles tendon
  • Congenital short left Achilles tendon
  • Congenital short right Achilles tendon
  • Congenital shortening of tendon
  • Congenital synostosis of proximal phalanx of great toe with first metatarsal bone
  • Congenital synostosis of tarsal and metatarsal bone
  • Congenital talipes calcaneus
  • Congenital talipes equinus
  • Congenital thickening of talus
  • Congenital thickening of tarsal bone
  • Constricting band of extremity
  • Constriction ring syndrome
  • Constriction ring syndrome of lower limb
  • Contracture of joint of bilateral feet
  • Contracture of joint of left foot
  • Contracture of joint of right foot
  • Deformity of toe due to amniotic band
  • Diplopodia
  • Duplication of lower limb bone
  • Duplication of tarsal bone
  • Duplication of the whole foot
  • Hammer toe
  • Hyperphalangy
  • Hypertrophy of bone of foot
  • Hypertrophy of nail
  • Incomplete ossification of calcaneus
  • Incomplete ossification of metatarsal bone
  • Incomplete ossification of talus
  • Incomplete ossification of tarsal bone
  • Lack of ossification of calcaneus
  • Lack of ossification of metatarsal bone
  • Lack of ossification of talus
  • Lack of ossification of tarsal bone
  • Longitudinal deficiency of tarsal bone
  • Macrodactyly of toe
  • Macrodactyly of toe of left foot
  • Macrodactyly of toe of right foot
  • Macrodactyly of toes - fatty nerve tumor
  • Macrodactyly of toes - simple
  • Naviculocuneiform bar
  • Occipital encephalocele
  • Os trigonum
  • Overriding toes
  • Partial ablepharon
  • Perodactylia of great toe
  • Perodactylia of lesser toe
  • Perodactylia of multiple toes
  • Plantarflexed cuboid
  • Plantarflexion deformity of foot
  • Polydactyly of toes
  • Progressive spondyloepimetaphyseal dysplasia, short stature, short fourth metatarsals, intellectual disability syndrome
  • Proximal interphalangeal joint symphalangism
  • Robin sequence
  • Short stature, Pierre Robin sequence, cleft mandible, hand anomalies, clubfoot syndrome
  • Short tarsus with absence of lower eyelashes syndrome
  • Stapes ankylosis with broad thumb and toe syndrome
  • Sugarman brachydactyly
  • Supernumerary calcaneus
  • Supernumerary metatarsal bone
  • Supernumerary tarsal bone
  • Symbrachydactyly
  • Symbrachydactyly of bilateral hands and feet
  • Symbrachydactyly of digit of hand
  • Symbrachydactyly of toe
  • Syndactyly of toes of left foot
  • Syndactyly of toes of right foot
  • Syndactyly of toes with fusion of bones
  • Syndactyly, camptodactyly and clinodactyly of fifth fingers, bifid toes syndrome
  • Talipes
  • Talipes calcaneus
  • Talipes equinus
  • Talipes of left foot
  • Talipes of right foot
  • Tall stature, scoliosis, macrodactyly of great toe syndrome
  • Talocalcaneal coalition
  • Tarsal coalition of left foot
  • Tarsal coalition of right foot
  • Tarsal coalitions
  • Tarsal-carpal coalition syndrome
  • Transverse deficiency of toe
  • Triphalangeal great toe
  • Varus deformity of great toe
  • XTE syndrome
  • Zechi Ceide syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Congenital asymmetric talipes
  • Congenital clubfoot NOS
  • Congenital talipes NOS
  • Congenital tarsal coalition
  • Hammer toe, congenital

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Clawfoot(congenital)
    • Clawtoe(congenital)
    • Clubfoot(congenital)
    • Coalition
      • calcaneo-scaphoid
    • Coalition
      • tarsal
    • Contraction(s), contracture, contracted
      • Achilles tendon
        • congenital
    • Deformity
      • foot (acquired)
        • congenital NOS
          • specified type NEC
    • Hammer toe(acquired) NEC
      • congenital
    • Overlapping toe(acquired)
      • congenital (fifth toe)
    • Overriding
      • toe (acquired)
        • congenital
    • Pes(congenital)
      • adductus
    • Short, shortening, shortness
      • tendon
        • Achilles (acquired)
          • congenital
    • Talipes(congenital)
    • Talipes(congenital)
      • asymmetric
    • Talipes(congenital)
      • calcaneus
    • Talipes(congenital)
      • equinus

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MAL008
Musculoskeletal congenital conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Clubfoot

    a deformed foot in which the foot is plantarflexed, inverted, and adducted.

  • Equinus Deformity

    plantar declination of the foot.

  • Flatfoot

    anomaly in which one or more of the arches of the feet are flat.

  • Talipes

    deformity in which the foot is misaligned with respect to the talus in the ankle joint. while mostly congenital, as in clubfoot, acquired deformities are included. acquired talipedes are often associated with other foot deformities such as syndactyly and polydactyly.

  • Talipes Cavus

    a foot deformity in which the arch of the foot is high and often the heel adducted.

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 Q66.89 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
754.70 Talipes NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
754.79 Cong foot deform NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
755.66 Anomalies of toes NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
755.67 Anomalies of foot NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q66.89Overview

Is Q66.89 (Other congenital deformities of feet) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified congenital deformities of feet on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q66.89 group to?

When other specified congenital deformities of feet is the principal diagnosis on an inpatient stay, it groups to MS-DRG 564, 565, 566, with relative weights from 0.7493 to 1.5436 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q66.89 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 specified congenital deformities of feet on inpatient claims.

What is the ICD-9 equivalent of Q66.89?

Under the General Equivalence Mappings, other specified congenital deformities of feet converts to ICD-9-CM 754.70 (talipes NOS), 754.79 (cong foot deform NEC), and 755.66 (anomalies of toes NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[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.