2026 ICD-10-CM Diagnosis Code Q33Congenital malformations of lung

ICD-10-CM Codes›Q00-Q99›Q30-Q34›Q33

ICD-10-CM Q33
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q33 is a non-billable ICD-10-CM category code for congenital malformations of lung, so it cannot be submitted on claims. Use a more specific code from this category instead, such as Q33.0, Q33.1, Q33.2, and Q33.3.

Code Identity

ICD-10-CM Code
Q33
Billable Status
No — Non-Billable Category
Code Describes
Congenital malformations of lung
Chapter
Q30-Q34
Congenital malformations of the respiratory system

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ30-Q34Congenital malformations of the respiratory system
CategoryQ33Congenital malformations of lung
This CodeQ33Congenital malformations of lung

Specific Coding for Congenital malformations of lungOverview

Non-specific codes like Q33 require more characters. Use one of these billable codes instead:

  • Use Q33.0 for Congenital cystic lung

  • Use Q33.1 for Accessory lobe of lung

  • Use Q33.2 for Sequestration of lung

  • Use Q33.3 for Agenesis of lung

  • Use Q33.4 for Congenital bronchiectasis

  • Use Q33.5 for Ectopic tissue in lung

  • Use Q33.6 for Congenital hypoplasia and dysplasia of lung

  • Use Q33.8 for Other congenital malformations of lung

  • Use Q33.9 for Congenital malformation of lung, unspecified

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.

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 Q33Overview

Is Q33 (Congenital malformations of lung) a billable code?

No. This is a category header that groups the codes for congenital malformations of lung, and headers cannot be submitted on claims. Claims for congenital malformations of lung need a more specific code from this category, such as Q33.0, Q33.1, and Q33.2.