DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Q02 diagnosis code · Billable category · FY2027

Q02 Microcephaly

  • Billable
  • Not CC/MCC
  • HCC 182
  • POA exempt

Q02 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 17 Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
  2. Q00-Q07 Congenital malformations of the nervous system (Q00-Q07)
  3. Q02 Microcephaly
CC / MCC
Neither
MS-DRG
091-093, 791, 793
HCC V28
182
POA
Exempt
Code Editor
–
Index entries
19

Instructions

At Q02

Includes

  • hydromicrocephaly
  • micrencephalon

Excludes1

  • Meckel-Gruber syndrome (Q61.9) Q61.9

Code first

  • , if applicable, congenital Zika virus disease

Notes that also apply

Chapter 17 instructions (Notes 1, Excludes2 1): printed on the chapter 17 page.

Index entries

  • Hydromicrocephaly → Q02
  • Micrencephalon, micrencephaly → Q02
  • Microcephalus, microcephalic, microcephaly → Q02
  • Microencephalon → Q02
  • Oligoencephalon → Q02
  • Hypoplasia, hypoplasticbrain → Q02
  • Hypoplasia, hypoplasticcephalic → Q02
  • Idiot, idiocy (congenital)microcephalic → Q02
  • Nondevelopmentbrain → Q02
  • Undeveloped, undevelopmentbrain (congenital) → Q02
  • Undeveloped, undevelopmentcerebral (congenital) → Q02
  • Absence (of) (organ or part) (complete or partial)skull bone (congenital)withmicrocephaly → Q02
  • Agenesisskull (bone)withmicrocephaly → Q02
  • Anomaly, anomalous (congenital) (unspecified type)skullwithmicrocephaly → Q02
  • Distortion(s) (congenital)skull bone(s) NECwithmicrocephaly → Q02
  • Hypoplasia, hypoplasticskull (bone)withmicrocephaly → Q02
  • Anomaly, anomalous (congenital) (unspecified type)boneskullwithmicrocephaly → Q02
  • Deformityskull (acquired)congenitalwithmicrocephaly → Q02
  • Imperfectclosure (congenital)skullwithmicrocephaly → Q02

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for Q02
CC / MCCNeither
Appendix BMDC 01 Diseases and Disorders of the Nervous System, MS-DRG 091-093 (Other Disorders of Nervous System with MCC…); MDC 15 Newborns and Other Neonates with Conditions Originating in Perinatal Period, MS-DRG 791 (Prematurity with Major Problems…); MDC 15 Newborns and Other Neonates with Conditions Originating in Perinatal Period, MS-DRG 793 (Full Term Neonate with Major Problems…)
Code Editor–
POAExempt
HCC V28HCC 182 Spinal Cord Disorders/Injuries

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy