ICD-10-CM 2027
ICD-10 code for hydantoin dysmorphism
From the official ICD-10-CM alphabetic index entry “Dysmorphism (due to) › hydantoin”. Page updated September 29, 2026.
About coding hydantoin dysmorphism
The ICD-10-CM code for hydantoin dysmorphism is Q86.1 (Fetal hydantoin syndrome).
Within Q86 (congenital malformation syndromes due to known exogenous causes, not elsewhere classified), Q86.1 is specifically for fetal hydantoin syndrome. Related codes cover fetal alcohol syndrome (dysmorphic) (Q86.0), Dysmorphism due to warfarin (Q86.2) and other congenital malformation syndromes due to known exogenous causes (Q86.8).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 794 (Neonate with Other Significant Problems, relative weight 1.4935), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about hydantoin dysmorphism ICD-10 codes
What is the ICD-10 code for hydantoin dysmorphism?
- Q86.1 — Fetal hydantoin syndrome.
Is Q86.1 billable?
- Yes. Q86.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can Q86.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict Q86.1 as a principal diagnosis.
Is Q86.1 a CC or MCC?
- No. Q86.1 is neither a CC nor an MCC under MS-DRG v44.0.