2026 ICD-10-CM Diagnosis Code Q86.8Other congenital malformation syndromes due to known exogenous causes

ICD-10-CM Codes›Q00-Q99›Q80-Q89›Q86

ICD-10-CM Q86.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Q86.8 is a billable ICD-10-CM diagnosis code for other congenital malformation syndromes due to known exogenous causes. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified congenital anomalies.

Code Identity

ICD-10-CM Code
Q86.8
Billable Status
Yes — Valid for Submission
Code Describes
Other congenital malformation syndromes due to known exogenous causes
Short Description
Oth congen malform syndromes due to known exogenous causes
Parent Code
Q86
Congenital malformation syndromes due to known exogenous causes, not elsewhere classified

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 CodeQ86.8Other congenital malformation syndromes due to known exogenous causes

Present on Admission (POA)Billing

Q86.8 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.

  • Congenital malformation caused by cytotoxic agents
  • Congenital malformation caused by valproic acid
  • Fetal anomaly caused by antihypertensive drug
  • Fetal benzodiazepine syndrome
  • Fetal carbamazepine syndrome
  • Fetal cocaine syndrome
  • Fetal disorder caused by anticonvulsant via placental transfer
  • Fetal iodine syndrome
  • Fetal methyl mercury syndrome
  • Fetal minoxidil syndrome
  • Fetal misoprostol syndrome
  • Fetal primidone syndrome
  • Fetal toluene syndrome
  • Fetal valproate syndrome
  • Indomethacin embryofetopathy
  • Isotretinoin syndrome
  • Maternal PKU fetal effect
  • Methimazole embryofetopathy
  • Multiple malformation syndrome due to non-infectious environmental agents
  • Mycophenolate mofetil embryopathy
  • Narcotic embryopathy
  • Phenobarbital embryopathy
  • Retinoid embryopathy
  • Thalidomide embryopathy 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.

    • Dysmorphism(due to)
      • exogenous cause NEC
    • Syndrome
      • malformation, congenital, due to
        • exogenous cause NEC

Clinical ClassificationClinical

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

CCSR MAL010
Other specified and unspecified congenital anomalies
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Fetal Valproate Syndrome

    a teratogenic disorder observed in a newborn or child of a mother who was exposed to valproic acid during pregnancy. manifestations include musculoskeletal abnormalities, intellectual disability, spina bifida, and distinctive facial features.

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 Q86.8 to ICD-9-CMHistory

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

ICD-9-CM
760.79 Nox sub NEC aff NB/fetus
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 Q86.8Overview

Is Q86.8 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other congenital malformation syndromes due to known exogenous causes on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is Q86.8 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 other congenital malformation syndromes due to known exogenous causes on inpatient claims.

What is the ICD-9 equivalent of Q86.8?

Under the General Equivalence Mappings, other congenital malformation syndromes due to known exogenous causes converts to ICD-9-CM 760.79 (nox sub NEC aff NB/fetus). 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.