2026 ICD-10-CM Diagnosis Code Q75.4Mandibulofacial dysostosis

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q75

ICD-10-CM Q75.4
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q75.4 is a billable ICD-10-CM diagnosis code for mandibulofacial dysostosis. 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
Q75.4
Billable Status
Yes — Valid for Submission
Code Describes
Mandibulofacial dysostosis
Short Description
Mandibulofacial dysostosis
Same as the full description in the CMS dataset.
Parent Code
Q75
Other congenital malformations of skull and face bones

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ75Other congenital malformations of skull and face bones
This CodeQ75.4Mandibulofacial dysostosis

Present on Admission (POA)Billing

Q75.4 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.

  • Asymmetry of mandible
  • Congenital asymmetry of jaw
  • Congenital facial asymmetry
  • Congenital mandibular asymmetry
  • Craniofacial microsomia
  • First arch syndrome
  • Hypertelorism
  • Intermandibular dysostosis
  • Mandibulofacial dysostosis with alopecia
  • Mandibulofacial dysostosis with microcephaly
  • Mandibulofacial dysostosis, macroblepharon, macrostomia syndrome
  • Otomandibular dysostosis
  • Patterson Stevenson Fontaine syndrome
  • Sphenoidal dysostosis
  • Temporo-auro-mandibular dysostosis
  • Treacher Collins syndrome
  • X-linked mandibulofacial dysostosis

Tabular List NotesGuidance

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

Inclusion Terms

  • Franceschetti syndrome
  • Treacher Collins syndrome

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.

    • Dysostosis
      • mandibulofacial (incomplete)
    • Franceschetti-Klein(-Wildervanck) disease or syndrome
    • Syndrome
      • Franceschetti
    • Syndrome
      • mandibulofacial dysostosis
    • Syndrome
      • Treacher Collins
    • Treacher Collins syndrome

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

  • Mandibulofacial Dysostosis

    a hereditary disorder occurring in two forms: the complete form (franceschetti's syndrome) is characterized by a slant of the palpebral fissures, coloboma of the lower lid, micrognathia and hypoplasia of the zygomatic arches, and congenital microtia. it is transmitted as an autosomal trait. the incomplete form (treacher collins syndrome) is characterized by the same anomalies in less pronounced degree. it occurs sporadically, but an autosomal dominant mode of transmission is suspected. (dorland, 27th ed)

  • Hypertelorism

    abnormal increase in the interorbital distance due to overdevelopment of the lesser wings of the sphenoid.

Patient EducationClinical

Craniofacial Abnormalities

Craniofacial is a medical term that relates to the bones of the skull and face. Craniofacial abnormalities are birth defects of the face or head. Some, like cleft lip and palate, are among the most common of all birth defects. Others are very rare. Most of them affect how a person's face or head looks.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Q75.4 to ICD-9-CMHistory

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

ICD-9-CM
756.0 Anomal skull/face bones
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 Q75.4Overview

Is Q75.4 (Other congenital malformations of skull and face bones) a billable code?

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

What MS-DRG does Q75.4 group to?

When mandibulofacial dysostosis 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 Q75.4 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 mandibulofacial dysostosis on inpatient claims.

What is the ICD-9 equivalent of Q75.4?

Under the General Equivalence Mappings, mandibulofacial dysostosis converts to ICD-9-CM 756.0 (anomal skull/face bones). 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.