2026 ICD-10-CM Diagnosis Code Q86.1Fetal hydantoin syndrome

ICD-10-CM Codes›Q00-Q99›Q80-Q89›Q86

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

Q86.1 is a billable ICD-10-CM diagnosis code for fetal hydantoin syndrome. 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
Q86.1
Billable Status
Yes — Valid for Submission
Code Describes
Fetal hydantoin syndrome
Short Description
Fetal hydantoin syndrome
Same as the full description in the CMS dataset.
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 CodeQ86.1Fetal hydantoin syndrome

Present on Admission (POA)Billing

Q86.1 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.

  • Fetal hydantoin syndrome

Tabular List NotesGuidance

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

Inclusion Terms

  • Meadow's 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)
      • hydantoin
    • Fetus, fetal
      • hydantoin syndrome
    • Meadow's syndrome
    • Syndrome
      • fetal
        • hydantoin
    • Syndrome
      • malformation, congenital, due to
        • hydantoin

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

Patient EducationClinical

Pregnancy and Medicines

Some medicines are safe to take during pregnancy, but many are not. If you're pregnant, check with your health care provider before taking any medicine. Some medicines can harm your developing fetus. This includes:

The full article covers:

  • Is it safe to take medicine during pregnancy?
  • Should I stop taking my medicine during pregnancy?
  • Can I take vitamins during pregnancy?

Read the full article at MedlinePlus

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

Convert Q86.1 to ICD-9-CMHistory

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

ICD-9-CM
760.77 Mat anticonv aff NB/fet
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 Q86.1Overview

Is Q86.1 a billable code?

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

Is Q86.1 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 fetal hydantoin syndrome on inpatient claims.

What is the ICD-9 equivalent of Q86.1?

Under the General Equivalence Mappings, fetal hydantoin syndrome converts to ICD-9-CM 760.77 (mat anticonv aff NB/fet). 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.