2026 ICD-10-CM Diagnosis Code Q73.8Other reduction defects of unspecified limb(s)

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q73

ICD-10-CM Q73.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q73.8 is a billable ICD-10-CM diagnosis code for other reduction defects of unspecified limb(s). 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
Q73.8
Billable Status
Yes — Valid for Submission
Code Describes
Other reduction defects of unspecified limb(s)
Short Description
Other reduction defects of unspecified limb(s)
Same as the full description in the CMS dataset.
Parent Code
Q73
Reduction defects of unspecified limb

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ73Reduction defects of unspecified limb
This CodeQ73.8Other reduction defects of unspecified limb(s)

Present on Admission (POA)Billing

Q73.8 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.

  • 10q partial trisomy syndrome
  • Abnormally short digit
  • Adactyly
  • Anetoderma
  • Aphalangy and syndactyly with microcephaly syndrome
  • Aphalangy, hemivertebra, urogenital, intestinal dysgenesis syndrome
  • Aplasia of bone structure of extremity
  • Aplasia of limb
  • Brachydactyly and distal symphalangism syndrome
  • Brachydactyly syndrome type B
  • Brachydactyly type A2
  • Brachydactyly with syndactyly Zhao type
  • Brachydactyly, mesomelia, intellectual disability, heart defect syndrome
  • Brachydactyly, short stature, retinitis pigmentosa syndrome
  • Brachymesophalangia
  • Coloboma of macula with brachydactyly type B syndrome
  • Congenital anomaly of macula
  • Congenital coloboma of macula lutea
  • Congenital dysplasia of radius
  • Congenital hypoplasia of bone of extremity
  • Congenital hypoplasia of breast
  • Congenital hypoplasia of limb
  • Congenital microgastria
  • Congenital microgastria with limb reduction defect syndrome
  • Cono-spondylar dysplasia
  • Craniomicromelic syndrome
  • Distal interphalangeal joint symphalangism
  • Distal limb deficiency with micrognathia syndrome
  • Dysraphism, cleft lip and palate, limb reduction defect syndrome
  • Ectromelia
  • Exostosis, anetoderma, brachydactyly type E syndrome
  • Heart defect and limb shortening syndrome
  • Ichthyosis, short stature, brachydactyly, microspherophakia syndrome
  • Lentiglobus
  • Liebenberg syndrome
  • Limb mammary syndrome
  • Longitudinal deficiency of limb
  • Longitudinal deficiency of part of limb
  • Mesoaxial synostotic syndactyly with phalangeal reduction syndrome
  • Mesomelic dysplasia of upper limb
  • Microlissencephaly micromelia syndrome
  • Micromelia
  • Micromelic dwarfism Fryn type
  • Microphakia
  • Microspherophakia
  • Oral-facial-digital syndrome with short stature and brachymesophalangia
  • Partial trisomy of chromosome 10
  • Rhizomelic dysplasia
  • Robin sequence
  • Robin sequence and oligodactyly syndrome
  • Rudimentary digit
  • Severe intellectual disability, epilepsy, anal anomaly, distal phalangeal hypoplasia syndrome
  • Skeletal dysplasia brachydactyly syndrome
  • Spherophakia
  • Spondyloepimetaphyseal dysplasia, short limb, abnormal calcification syndrome
  • Symbrachydactyly
  • Temtamy preaxial brachydactyly syndrome
  • Thumb stiffness, brachydactyly, intellectual disability syndrome
  • Trisomy 10
  • Uncombable hair, retinal pigmentary dystrophy, dental anomaly and brachydactyly syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Longitudinal reduction deformity of unspecified limb(s)
  • Ectromelia of limb NOS
  • Hemimelia of limb NOS
  • Reduction defect of limb 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.

    • Aplasia
      • limb (congenital)
    • Defect, defective
      • reduction
        • limb
    • Defect, defective
      • reduction
        • limb
          • specified type NEC
    • Deformity
      • reduction (extremity) (limb), congenital
    • Ectromelia
    • Hemiectromelia
    • Hemimelia
    • Hypoplasia, hypoplastic
      • limb

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

  • Anetoderma

    benign dermatosis caused by a loss of dermal elastic tissue resulting in localized sac-like areas of flaccid skin. it can be either primary (idiopathic) or secondary to other skin conditions, penicillamine use, or premature birth.

  • Ectromelia

    gross hypo- or aplasia of one or more long bones of one or more limbs. the concept includes amelia, hemimelia, phocomelia, and sirenomelia.

  • Ectromelia virus

    a species of orthopoxvirus infecting mice and causing a disease that involves internal organs and produces characteristic skin lesions.

  • Ectromelia, Infectious

    a viral infection of mice, causing edema and necrosis followed by limb loss.

  • Orthopoxvirus

    a genus of the family poxviridae, subfamily chordopoxvirinae, comprising many species infecting mammals. viruses of this genus cause generalized infections and a rash in some hosts. the type species is vaccinia virus.

  • Spherophakia

    a congenital disorder of the eye where the lens is abnormally small and spherical.

  • Weill-Marchesani Syndrome 1|Congenital Mesodermal Dysmorphodystrophy|Spherophakia-Brachymorphia Syndrome|Spherophakia-brachymorphia syndrome|Weill-Marchesani, Autosomal Recessive

    an autosomal recessive subtype of weill-marchesani syndrome caused by mutations in the adamts10 gene, encoding a disintegrin and metalloproteinase with thrombospondin motifs 10.

  • Trisomy 10

    a chromosomal abnormality consisting of the presence of a third copy of chromosome 10 in somatic cells.

  • Ectromelia

    a congenital defect characterized by the absence or hypoplasia of one or more extremities.

  • Rhizomelic Dysplasia

    a form of skeletal dysplasia characterized by shortening of the bones of the proximal segments of the limbs (i.e. the humeri and femora).

  • Anetoderma

    a dermatologic condition characterized by focal loss of elastic tissue. clinically it presents with atrophic depressions or saccular outpouchings of the skin.

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 Q73.8 to ICD-9-CMHistory

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

ICD-9-CM
755.4 Reduct deform limb 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 Q73.8Overview

Is Q73.8 (Reduction defects of unspecified limb) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other reduction defects of unspecified limb(s) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q73.8 group to?

When other reduction defects of unspecified limb(s) 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 Q73.8 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 reduction defects of unspecified limb(s) on inpatient claims.

What is the ICD-9 equivalent of Q73.8?

Under the General Equivalence Mappings, other reduction defects of unspecified limb(s) converts to ICD-9-CM 755.4 (reduct deform limb 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.