2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 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

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 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.

  • 10q partial trisomy syndrome
  • Abnormally short digit
  • Acromelia
  • Adactyly
  • Anetoderma
  • Ankylosis of joint of thumb
  • 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
  • Fetal growth restriction
  • Heart defect and limb shortening syndrome
  • Ichthyosis, short stature, brachydactyly, microspherophakia syndrome
  • Intrauterine growth retardation, micrognathia, short stature, facial dysmorphism, rhizomelic shortening 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
  • Rhizomelia
  • 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q73.8: its own notes plus those printed at 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.

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

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.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • 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 Q73.8, its category, or a range that includes it.

Excludes1 4

These codes carry an Excludes1 note naming Q73.8: they are not reported together with it, unless the two conditions are unrelated.

  • M21 Other acquired deformities of limbs
    congenital absence of limbs (Q71-Q73) names Q71-Q73, which includes this code
  • Q68 Other congenital musculoskeletal deformities
    reduction defects of limb(s) (Q71-Q73) names Q71-Q73, which includes this code
  • Q74 Other congenital malformations of limb(s)
    reduction defect of limb (Q71-Q73) names Q71-Q73, which includes this code
  • Z89 Acquired absence of limb
    congenital absence of limbs (Q71-Q73) names Q71-Q73, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

  • Ectromelia

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q73.8Overview

What is the ICD-10 code for other reduction defects of unspecified limb(s)?

The ICD-10-CM code for other reduction defects of unspecified limb(s) is Q73.8 (sometimes written as Q738). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 566, 565, with relative weights from 0.7374 to 1.4909 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. The code appears in the Congenital malformations and deformations of the musculoskeletal system (Q65-Q79) range of the CMS exempt list.

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.