2026 ICD-10-CM Diagnosis Code Q31.5Congenital laryngomalacia

ICD-10-CM Codes›Q00-Q99›Q30-Q34›Q31

ICD-10-CM Q31.5
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q31.5 is a billable ICD-10-CM diagnosis code for congenital laryngomalacia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 11 through 13, 154 through 156. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 18 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Respiratory congenital malformations.

Code Identity

ICD-10-CM Code
Q31.5
Billable Status
Yes — Valid for Submission
Code Describes
Congenital laryngomalacia
Short Description
Congenital laryngomalacia
Same as the full description in the CMS dataset.
Parent Code
Q31
Congenital malformations of larynx

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ30-Q34Congenital malformations of the respiratory system
CategoryQ31Congenital malformations of larynx
This CodeQ31.5Congenital laryngomalacia

Present on Admission (POA)Billing

Q31.5 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of the respiratory system (Q30-Q34).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congenital laryngomalacia
  • Laryngomalacia
  • Laryngotracheomalacia
  • Tracheomalacia

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 MAL007
Respiratory congenital malformations
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Laryngomalacia

    a congenital or acquired condition of underdeveloped or degeneration of cartilage in the larynx. this results in a floppy laryngeal wall making patency difficult to maintain.

  • Tracheomalacia

    a congenital or acquired condition of underdeveloped or degeneration of cartilage in the trachea. this results in a floppy tracheal wall making patency difficult to maintain. it is characterized by wheezing and difficult breathing.

  • Laryngomalacia

    increased collapsibility of the larynx.

  • Tracheomalacia

    a congenital or acquired abnormality of the wall of the trachea. in congenital cases, there is lack of rigidity in the cartilage of the tracheal wall. in acquired cases, the cartilage of the tracheal wall is degenerated, secondary to tracheostomy or prolonged presence of a breathing tube, or as a complication of a tracheoesophageal fistula surgical repair. symptoms include stridor, noisy breathing, and upper respiratory infections.

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 Q31.5 to ICD-9-CMHistory

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

ICD-9-CM
748.3 Laryngotrach anomaly 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 Q31.5Overview

What is the ICD-10 code for congenital laryngomalacia?

The ICD-10-CM code for congenital laryngomalacia is Q31.5 (sometimes written as Q315). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is Q31.5 (Congenital malformations of larynx) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital laryngomalacia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Q31.5 group to?

When congenital laryngomalacia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 11, 12, 13, 154, 155, 156, with relative weights from 0.6911 to 5.4541 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Q31.5 a CC or MCC?

CMS lists Q31.5 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 18 closely related codes in its exclusion list.

Is Q31.5 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 congenital laryngomalacia on inpatient claims. The code appears in the Congenital malformations of the respiratory system (Q30-Q34) range of the CMS exempt list.