2026 ICD-10-CM Diagnosis Code Q86Congenital malformation syndromes due to known exogenous causes, not elsewhere classified

ICD-10-CM Codes›Q00-Q99›Q80-Q89›Q86

ICD-10-CM Q86
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q86 is a non-billable ICD-10-CM category code for congenital malformation syndromes due to known exogenous causes, not elsewhere classified, so it cannot be submitted on claims. Use a more specific code from this category instead, such as Q86.0, Q86.1, Q86.2, and Q86.8.

Code Identity

ICD-10-CM Code
Q86
Billable Status
No — Non-Billable Category
Code Describes
Congenital malformation syndromes due to known exogenous causes, not elsewhere classified
Chapter
Q80-Q89
Other congenital malformations

Code Classification

ChapterQ00-Q99Congenital malformations, deformations and chromosomal abnormalities
SectionQ80-Q89Other congenital malformations
CategoryQ86Congenital malformation syndromes due to known exogenous causes, not elsewhere classified
This CodeQ86Congenital malformation syndromes due to known exogenous causes, not elsewhere classified

Specific Coding for Congen malform syndromes due to known exogenous causes, NECOverview

Non-specific codes like Q86 require more characters. Use one of these billable codes instead:

  • Use Q86.0 for Fetal alcohol syndrome (dysmorphic)

  • Use Q86.1 for Fetal hydantoin syndrome

  • Use Q86.2 for Dysmorphism due to warfarin

  • Use Q86.8 for Other congenital malformation syndromes due to known exogenous causes

Tabular List NotesGuidance

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

Type 2 Excludes

  • iodine-deficiency-related hypothyroidism E00 E02
  • nonteratogenic effects of substances transmitted via placenta or breast milk P04

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 Q86Overview

Is Q86 a billable code?

No. This is a category header that groups the codes for congenital malformation syndromes due to known exogenous causes, not elsewhere classified, and headers cannot be submitted on claims. Claims for congenital malformation syndromes due to known exogenous causes, not elsewhere classified need a more specific code from this category, such as Q86.0, Q86.1, and Q86.2.