Q02 – Microcephaly
ICD-10-CM 2027 diagnosis code · Congenital malformations of the nervous system
ICD-10-CM code
Q02
- Code
Q02(claims format:Q02)- Description
- Microcephaly
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
- Block
- Q00-Q07 Congenital malformations of the nervous system
Notes for Q02
Includes:
- hydromicrocephaly
- micrencephalon
Excludes1 (not coded here):
- Meckel-Gruber syndrome (Q61.9)
Code first:
- , if applicable, congenital Zika virus disease
Index terms for Q02
Entries in the ICD-10-CM alphabetic index that lead to this code:
- Oligoencephalon
- Microencephalon
- Hydromicrocephaly
- Nondevelopment, brain
- Idiot, idiocy, microcephalic
- Micrencephalon, micrencephaly
- Hypoplasia, hypoplastic, brain
- Undeveloped, undevelopment, brain
- Hypoplasia, hypoplastic, cephalic
- Agenesis, skull, with, microcephaly
- Undeveloped, undevelopment, cerebral
- Absence, skull bone, with, microcephaly
- Microcephalus, microcephalic, microcephaly
- Distortion, skull bone, with, microcephaly
- Imperfect, closure, skull, with, microcephaly
- Anomaly, anomalous, skull, with, microcephaly
- Deformity, skull, congenital, with, microcephaly
- Hypoplasia, hypoplastic, skull, with, microcephaly
- Anomaly, anomalous, bone, skull, with, microcephaly
Frequently asked questions
What is ICD-10 code Q02?
Q02 is the ICD-10-CM code for microcephaly, in the block Q00-Q07 (Congenital malformations of the nervous system).
Is Q02 a billable code?
Yes. Q02 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.