2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Q86.1 is a billable ICD-10-CM diagnosis code for fetal hydantoin syndrome. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 794. 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 the other POA exempt codes in Other congenital malformations (Q80-Q89).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Fetal hydantoin syndrome

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Q86.1: its own notes plus those printed at Q86 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Meadow's syndrome

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Q86 Congenital malformation syndromes due to known exogenous causes, not elsewhere classified applies to 4 codes
  • iodine-deficiency-related hypothyroidism (E00-E02)
  • nonteratogenic effects of substances transmitted via placenta or breast milk (P04.-)
From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • inborn errors of metabolism (E70-E88)

Notes

General instructions on how these codes are used.

From Chapter 17 (Q00-QA1) Congenital malformations, deformations and chromosomal abnormalities applies to 900 codes
  • Codes from this chapter are not for use on maternal records

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Q86.1, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming Q86.1: they are not reported together with it, unless the two conditions are unrelated.

  • P04.1 Newborn affected by other maternal medication
    fetal hydantoin syndrome (Q86.1)

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

Clinical InformationClinical

  • Fetal Hydantoin Syndrome

    a teratogenic disorder observed in a newborn or child of a mother who was exposed to phenytoin during pregnancy. manifestations include dysmorphic craniofacial features, hypoplastic distal phalanges and nails, growth delay and delayed psychomotor development.

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Q86.1Overview

What is the ICD-10 code for fetal hydantoin syndrome?

The ICD-10-CM code for fetal hydantoin syndrome is Q86.1 (sometimes written as Q861). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does Q86.1 group to?

When fetal hydantoin syndrome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 794 (neonate with Other Significant Problems), which carries a relative weight of 1.4934. Higher weights mean higher Medicare reimbursement.

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. The code appears in the Other congenital malformations (Q80-Q89) range of the CMS exempt list.

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.