Q02
Microcephaly
Q02 is a billable ICD-10-CM diagnosis code for microcephaly. It is part of the FY2027 code set, effective October 1, 2026. The Alphabetic Index lists it under 19 entries. Its coding notes include a Code first instruction, 1 Excludes1 entry and 1 Excludes2 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Chapter 17 codes can be used for life. Manifestations that are an inherent part of a specifically coded anomaly are not coded separately. A corrected malformation is reported with a personal history code.
Code first
If the underlying condition listed here is present and known, sequence it first.
- , if applicable, congenital Zika virus disease
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- Meckel-Gruber syndrome (Q61.9)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (1 note)
- inborn errors of metabolism (E70-E88)
Includes
Further defines or gives examples of the content of the category.
- hydromicrocephaly
- micrencephalon
Notes
Also from chapter/block level (1 note)
- Codes from this chapter are not for use on maternal records
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 19 entries
- Absence (of) (organ or part) (complete or partial), skull bone (congenital), with, microcephaly
- Agenesis, skull (bone), with, microcephaly
- Anomaly, anomalous (congenital) (unspecified type), bone, skull, with, microcephaly
- Anomaly, anomalous (congenital) (unspecified type), skull, with, microcephaly
- Deformity, skull (acquired), congenital, with, microcephaly
- Distortion (s) (congenital), skull bone (s) NEC, with, microcephaly
- Hydromicrocephaly
- Hypoplasia, hypoplastic, brain
- Hypoplasia, hypoplastic, cephalic
- Hypoplasia, hypoplastic, skull (bone), with, microcephaly
- Idiot, idiocy (congenital), microcephalic
- Imperfect, closure (congenital), skull, with, microcephaly