2026 ICD-10-CM Diagnosis Code Q70.9Syndactyly, unspecified

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q70

ICD-10-CM Q70.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q70.9 is a billable ICD-10-CM diagnosis code for syndactyly, unspecified. 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
Q70.9
Billable Status
Yes — Valid for Submission
Code Describes
Syndactyly, unspecified
Short Description
Syndactyly, unspecified
Same as the full description in the CMS dataset.
Parent Code
Q70
Syndactyly

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ70Syndactyly
This CodeQ70.9Syndactyly, unspecified

Present on Admission (POA)Billing

Q70.9 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.

  • 2q partial trisomy syndrome
  • Acrocephalosyndactyly
  • Acrocephalosyndactyly type V
  • Anal atresia
  • Ankylosis of joint of finger of left hand
  • Ankylosis of joint of finger of right hand
  • Ankylosis of proximal interphalangeal joint
  • Aphalangy and syndactyly with microcephaly syndrome
  • Bilateral distal interphalangeal joint symphalangism
  • Bilateral proximal symphalangism
  • Bilateral syndactyly of toes
  • Blepharophimosis, ptosis, esotropia, syndactyly, short stature syndrome
  • Brachydactyly and distal symphalangism syndrome
  • Brachymesophalangia
  • Cenani Lenz syndrome
  • Cleft hand with syndactyly
  • Congenital anomaly of lobe of ear
  • Congenital bony fusion of phalanges
  • Congenital cleft hand
  • Congenital clinodactyly
  • Congenital clinodactyly of finger
  • Congenital clinodactyly of little finger
  • Congenital hypoplasia of nail unit
  • Congenital malformation of the eyebrow
  • Congenital nystagmus
  • Distal interphalangeal joint symphalangism
  • Duplication of eyebrow and syndactyly syndrome
  • Ectodermal dysplasia syndactyly syndrome
  • Ectodermal dysplasia, hyperhidrosis, cutaneous syndactyly syndrome
  • Ectodermal dysplasia, syndactyly and pili torti
  • FBLN1-related developmental delay, central nervous system anomaly, syndactyly syndrome
  • Fibular aplasia, tibial campomelia, oligo-syndactyly syndrome
  • Mesoaxial synostotic syndactyly with phalangeal reduction syndrome
  • Partial trisomy of chromosome 2
  • Pendular nystagmus
  • Pfeiffer syndrome type 1
  • Pfeiffer syndrome type 2
  • Pfeiffer syndrome type 3
  • Polysyndactyly and cardiac malformation syndrome
  • Proximal interphalangeal joint symphalangism
  • STAR syndrome
  • Symphalangism
  • Symphalangism Cushing type
  • Symphalangism with multiple anomalies of hands and feet syndrome
  • Syndactyly
  • Syndactyly of fingers of bilateral hands
  • Syndactyly of fingers of left hand
  • Syndactyly of fingers of right hand
  • Syndactyly of thumb
  • Syndactyly of toes of left foot
  • Syndactyly of toes of right foot
  • Syndactyly type 1
  • Syndactyly type 2
  • Syndactyly type 4
  • Syndactyly type 5
  • Syndactyly, camptodactyly and clinodactyly of fifth fingers, bifid toes syndrome
  • Syndactyly, nystagmus syndrome due to 2q31.1 microduplication
  • Syndactyly, polydactyly, ear lobe syndrome
  • Telecanthus

Tabular List NotesGuidance

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

Inclusion Terms

  • Symphalangy NOS

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.

    • Dactylosymphysis
    • Symphalangy(fingers) (toes)
    • Syndactylism, syndactyly

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

  • Poland Syndrome

    a syndrome which is characterized by symbrachydactyly and aplasia of the sternal head of pectoralis major.

  • Syndactyly

    a congenital anomaly of the hand or foot, marked by the webbing between adjacent fingers or toes. syndactylies are classified as complete or incomplete by the degree of joining. syndactylies can also be simple or complex. simple syndactyly indicates joining of only skin or soft tissue; complex syndactyly marks joining of bony elements.

  • Complex Syndactyly of Fingers|Complex syndactyly of fingers

    syndactyly of the fingers in which the fused tissue includes skin, bone and soft tissues.

  • Type II Acrocephalopolysyndactyly|Acrocephalopolysyndactyly Type II|Acrocephalopolysyndactyly Type II|Carpenter Syndrome|Carpenter Syndrome|Carpenter's Syndrome

    an extremely rare autosomal recessive syndrome characterized by premature closure of cranial sutures leading to cone-shaped head, fusion of the digits, and the presence of more digits than normal. it may be associated with heart defects, single horseshoe-shaped kidney, short stature, undescended testes, and mild mental retardation.

  • Acrocephalosyndactyly

    a genetic disorder characterized by craniosynostosis and fusion of the fingers and toes.

  • Fraser Syndrome|Cryptophthalmos-Syndactyly Syndrome

    a rare, autosomal recessive inherited disorder caused by mutations in the fras1, frem2, or grip1 genes. it is characterized by the presence of cryptophthalmos, cutaneous syndactyly, and genitourinary abnormalities.

  • GJA1 wt Allele|AVSD3|CMDR|CX43|DFNB38|GJAL|Gap Junction Protein, Alpha 1, 43kDa (Connexin 43) Gene|Gap Junction Protein, Alpha 1, 43kDa wt Allele|Gap Junction Protein, Alpha-1 Gene|Gap Junction Protein, Alpha-Like Gene|HLHS1|HSS|ODDD|Oculodentodigital Dysplasia (Syndactyly Type III) Gene

    human gja1 wild-type allele is located in the vicinity of 6q22.31 and is approximately 14 kb in length. this allele, which encodes gap junction alpha-1 protein, plays a role in the modulation of the activity of gap junctions. mutation of the gene is associated with atrioventricular septal defect 3, autosomal recessive craniometaphyseal dysplasia, hypoplastic left heart syndrome 1, oculodentodigital dysplasia and syndactyly, type iii.

  • GLI3 Gene|GLI-Kruppel Family Member GLI3 (Greig Cephalopolysyndactyly Syndrome) Gene|GLI3|GLI3

    this gene plays a regulatory role in limb development and is involved in sonic hedgehog signal transduction.

  • GLI3 wt Allele|GCPS|GLI-Kruppel Family Member 3|GLI-Kruppel Family Member GLI3 (Greig Cephalopolysyndactyly Syndrome) wt Allele|GLI3|PAP-A|PAPA|PHS

    human gli3 wild-type allele is located in the vicinity of 7p13 and is approximately 272 kb in length. this allele, which encodes zinc finger protein gli3, plays a role in the regulation of sonic hedgehog-dependent transcription of specific genes during the development of multiple organ systems. this gene is the site of a mutation that is linked to greig cephalopolysyndactyly syndrome.

  • Greig Syndrome|GCPS|Greig Cephalopolysyndactyly Syndrome|Greig Cephalosyndactyly Syndrome|Greig's Syndrome

    an autosomal dominant genetic disorder caused by mutations in the gli3 gene. it is characterized by physical abnormalities of the fingers and/or toes (extra fingers and/ or toes, fusion of the fingers and/or toes), large size head with prominent forehead and hypertelorism.

  • Polysyndactyly

    a rare anatomical malformation characterized by polydactyly (extra fingers or toes) and syndactyly (webbed fingers or toes).

  • Sclerosteosis|Cortical Hyperostosis with Syndactyly|Cortical Hyperostosis with Syndactyly

    an autosomal recessive form of craniotubular hyperostosis due to loss-of-function mutation(s) in the sost gene, encoding sclerostin. clinical features include tall stature, enlarged jaw and facial bones, and cranial nerve compression leading to hearing loss and facial palsy. about two-thirds of patients have syndactyly and/or nail malformations. increased intracranial pressure due to the thickened calvaria and skull base can occur.

  • Syndactyly

    a congenital condition characterized by webbing between the fingers and/or toes, joining the digits together. in rare cases, the joining of the fingers or toes may involve bony fusion between the digits. common causes include down syndrome and hereditary syndactyly.

  • TWIST1 Gene|TWIST1|TWIST1|Twist Homolog 1 (Acrocephalosyndactyly 3; Saethre-Chotzen Syndrome) (Drosophila) Gene

    this gene plays a role in regulation of transcription and the inhibition of apoptosis. it is also involved in the control of morphogenesis during embryonic development.

  • TWIST1 wt Allele|ACS3|BPES2|BPES3|SCS|TWIST|Twist Homolog 1 (Acrocephalosyndactyly 3; Saethre-Chotzen Syndrome) (Drosophila) wt Allele

    human twist1 wild-type allele is located in the vicinity of 17p13.3 and is approximately 16 kb in length. this allele, which encodes twist-related protein 1, plays a role in the regulation of both transcription and cell lineage determination. mutations in the gene are associated with saethre-chotzen, robinow-sorauf, and baller-gerold syndromes.

  • Twist-Related Protein 1|Acrocephalosyndactyly 3 Protein|Class A Basic Helix-Loop-Helix Protein 38|H-Twist|TWIST|TWIST1|TWIST1 Protein|Twist Homolog|Twist Homolog 1|Twist Related Protein 1|bHLHa38

    twist-related protein 1 (202 aa, ~21 kda) is encoded by the human twist1 gene. this protein plays a role in the negative regulation of both transcription and myogenesis.

  • Type I Acrocephalosyndactyly|Acrocephalosyndactyly Type I|Apert Syndrome

    an autosomal dominant inherited type of acrocephalosyndactyly caused by mutations in the fgfr2 gene. it is characterized by early closure of the sutures between the skull bones, bulging eyes, low-set ears, fusion of the second, third, and forth fingers, and fusion of the toes.

  • Type II Acrocephalopolysyndactyly|Acrocephalopolysyndactyly Type II|Acrocephalopolysyndactyly Type II|Carpenter 's Syndrome|Carpenter Syndrome|Carpenter Syndrome

    an extremely rare autosomal recessive syndrome characterized by premature closure of cranial sutures leading to cone-shaped head, fusion of the digits, and the presence of more digits than normal. it may be associated with heart defects, single horseshoe-shaped kidney, short stature, undescended testes, and mild mental retardation.

  • Type III Acrocephalosyndactyly|Acrocephalosyndactyly Type III|Saethre-Chotzen Syndrome|Saethre-Chotzen Syndrome

    a rare autosomal dominant syndrome caused by mutations in the twist1 gene. it is characterized by premature closure of skull bones resulting in abnormally shaped head, high forehead, hypertelorism, and facial asymmetry. it may be associated with fusion of certain fingers or toes.

  • Type V Acrocephalosyndactyly|Acrocephalosyndactyly Type V|Noack Syndrome|Pfeiffer Syndrome

    an autosomal dominant inherited type of acrocephalosyndactyly caused by mutations in the fgfr1 or fgfr2 genes. it is characterized by early closure of the sutures between the skull bones, bulging and wide-set eyes, broad thumbs, big toes, and partial syndactyly in the hands and toes.

  • GLI3 wt Allele|ACLS|GCPS|GCPS-190|GLI-Kruppel Family Member 3|GLI-Kruppel Family Member GLI3 (Greig Cephalopolysyndactyly Syndrome) wt Allele|GLI3FL|PAP-A|PAPA|PAPA1|PAPB|PHS|PPDIV

    human gli3 wild-type allele is located in the vicinity of 7p13 and is approximately 272 kb in length. this allele, which encodes zinc finger protein gli3, plays a role in the regulation of sonic hedgehog-dependent transcription of specific genes during the development of multiple organ systems. this gene is the site of a mutation that is linked to greig cephalopolysyndactyly syndrome.

Patient EducationClinical

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Convert Q70.9 to ICD-9-CMHistory

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

ICD-9-CM
755.10 Syndactyly, multiple/NOS
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 Q70.9Overview

Is Q70.9 (Syndactyly) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report syndactyly, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q70.9 group to?

When syndactyly, unspecified 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 Q70.9 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 syndactyly, unspecified on inpatient claims.

What is the ICD-9 equivalent of Q70.9?

Under the General Equivalence Mappings, syndactyly, unspecified converts to ICD-9-CM 755.10 (syndactyly, multiple/NOS). 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.