Microcephaly (Q02) ICD-10-CM
The Q02 code range covers microcephaly with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- hydromicrocephaly
- micrencephalon
Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
- , if applicable, congenital Zika virus disease
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
- Meckel-Gruber syndrome Q61.9
Codes in the Q02 Range 1 codes · 1 billable
- Q02 Microcephaly
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the Q02 range.
Microcephaly
A congenital abnormality in which the CEREBRUM is underdeveloped, the fontanels close prematurely, and, as a result, the head is small. (Desk Reference for Neuroscience, 2nd ed.)
About the Q02 Code Range
Microcephaly is present at birth and involves an underdeveloped cerebrum, a part of the brain. The skull’s soft spots close early, resulting in a small head.
Within congenital malformations of the nervous system, Q02 identifies this condition.
Questions About This Page
How many billable codes are in the Q02 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the Q02 range classify?
The range classifies microcephaly. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
