2027 ICD-10-CM Diagnosis Code Q71.50Longitudinal reduction defect of unspecified ulna

ICD-10-CM Codes›Q00-Q99›Q65-Q79›Q71

ICD-10-CM Q71.50
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q71.50 is a billable ICD-10-CM diagnosis code for longitudinal reduction defect of unspecified ulna. 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
Q71.50
Billable Status
Yes — Valid for Submission
Code Describes
Longitudinal reduction defect of unspecified ulna
Short Description
Longitudinal reduction defect of unspecified ulna
Same as the full description in the CMS dataset.
Parent Code
Q71.5
Longitudinal reduction defect of ulna

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ65-Q79Congenital malformations and deformations of the musculoskeletal system
CategoryQ71Reduction defects of upper limb
This CodeQ71.50Longitudinal reduction defect of unspecified ulna

Present on Admission (POA)Billing

Q71.50 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.

  • Agenesis of ulna
  • Aplasia of bone of radius and/or ulna
  • Aplasia of ulna
  • Congenital abnormal shape of radius
  • Congenital abnormal shape of ulna
  • Congenital absence of radius
  • Congenital absence of ulna
  • Congenital hypoplasia of bone of radius and/or ulna
  • Congenital hypoplasia of fibula
  • Congenital hypoplasia of ulna
  • Deformity of radius
  • Deformity of ulna
  • Longitudinal absence of radius AND ulna
  • Longitudinal deficiency of radius
  • Longitudinal deficiency of radius AND ulna
  • Longitudinal deficiency of ulna
  • Partial defect of ulna
  • Phocomelia
  • Phocomelia of upper limb
  • Saito Kuba Tsuruta syndrome
  • Short ulna, dysmorphism, hypotonia, intellectual disability syndrome
  • Spondyloperipheral dysplasia
  • Spondyloperipheral dysplasia with short ulna syndrome

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q71.50: its own notes plus those printed at Chapter 17. A note printed at a category, block or chapter applies to every code under it.

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 Q71.50, its category, or a range that includes it.

Excludes1 4

These codes carry an Excludes1 note naming Q71.50: 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

Clinical ClassificationClinical

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

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

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 Q71.50 to ICD-9-CMHistory

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

ICD-9-CM
755.27 Longitudinal defic ulna
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 Q71.50Overview

What is the ICD-10 code for longitudinal reduction defect of unspecified ulna?

The ICD-10-CM code for longitudinal reduction defect of unspecified ulna is Q71.50 (sometimes written as Q7150). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Q71.50 (Longitudinal reduction defect of ulna) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report longitudinal reduction defect of unspecified ulna on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Q71.50 group to?

When longitudinal reduction defect of unspecified ulna 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 Q71.50 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 longitudinal reduction defect of unspecified ulna 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 Q71.50?

Under the General Equivalence Mappings, longitudinal reduction defect of unspecified ulna converts to ICD-9-CM 755.27 (longitudinal defic ulna). The mapping is approximate, so confirm the match fits the documentation.