2026 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 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

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 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
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 other POA exempt codes.

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

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

  • Spondyloperipheral Dysplasia

    an autosomal dominant condition caused by mutation(s) in the col2a1 gene, encoding collagen alpha-1(ii) chain. it is characterized by short stature, pugilistic facies, midface hypoplasia, spondyloepiphyseal dysplasia, kyphosis, short ulna, and absent styloid process. mutation(s) in the same gene are responsible for kniest dysplasia.

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Q71.50Overview

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, 2025 through September 30, 2026.

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, 565, 566, with relative weights from 0.7493 to 1.5436 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.

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.

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.