2026 ICD-10-CM Diagnosis Code Q93.3Deletion of short arm of chromosome 4

ICD-10-CM Codes›Q00-Q99›Q90-Q99›Q93

ICD-10-CM Q93.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q93.3 is a billable ICD-10-CM diagnosis code for deletion of short arm of chromosome 4. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is exempt from POA reporting. Coders also document this condition as 4p partial monosomy syndrome. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Chromosomal abnormalities.

Code Identity

ICD-10-CM Code
Q93.3
Billable Status
Yes — Valid for Submission
Code Describes
Deletion of short arm of chromosome 4
Short Description
Deletion of short arm of chromosome 4
Same as the full description in the CMS dataset.
Parent Code
Q93
Monosomies and deletions from the autosomes, not elsewhere classified

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ90-Q99Chromosomal abnormalities, not elsewhere classified
CategoryQ93Monosomies and deletions from the autosomes, not elsewhere classified
This CodeQ93.3Deletion of short arm of chromosome 4

Present on Admission (POA)Billing

Q93.3 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.

  • 4p partial monosomy syndrome
  • Aplasia cutis in Chromosome 4 short-arm deletion syndrome
  • Deletion of part of chromosome 4
  • Wolf Hirschhorn syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Wolff-Hirschorn 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.

    • Deletion(s)
      • chromosome
        • short arm
          • 4
    • Syndrome
      • chromosome 4 short arm deletion
    • Wolff-Hirschorn syndrome

Clinical ClassificationClinical

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

CCSR MAL009
Chromosomal abnormalities
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Genetic Disorders

Genetic disorders are health conditions caused by changes (also called mutations or variants) in your genes. Genes are parts of DNA found in your cells that carry instructions for how your body grows, develops, and functions. Many genes tell your body how to make proteins, which are needed for your body to work properly.

The full article covers:

  • What are genetic disorders?
  • What causes genetic disorders?
  • What are the types of genetic disorders?
  • What are the different ways a genetic disorder can be inherited?
  • How are genetic disorders diagnosed?

Read the full article at MedlinePlus

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

Convert Q93.3 to ICD-9-CMHistory

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

ICD-9-CM
758.39 Autosomal deletions NEC
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 Q93.3Overview

Is Q93.3 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report deletion of short arm of chromosome 4 on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is Q93.3 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 deletion of short arm of chromosome 4 on inpatient claims.

What is the ICD-9 equivalent of Q93.3?

Under the General Equivalence Mappings, deletion of short arm of chromosome 4 converts to ICD-9-CM 758.39 (autosomal deletions NEC). 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.