Q02 — Microcephaly
Is Q02 billable?
Yes — Q02 is billable for FY2027. Q02 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Q02 may be submitted for encounters from October 1, 2026 through September 30, 2027.
Q02 at a glance
| Code | Q02 |
|---|---|
| Description | Microcephaly |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does Q02 group to?
Q02 sits in MDC 01 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 091Other Disorders of Nervous System with MCCmedical
- 092Other Disorders of Nervous System with CCmedical
- 093Other Disorders of Nervous System without CC/MCCmedical
How is Q02 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to Q02. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Hydromicrocephaly
- Micrencephalon, micrencephaly
- Microcephalus, microcephalic, microcephaly
- Microencephalon
- Oligoencephalon
- Hypoplasia, hypoplastic › brain
- Hypoplasia, hypoplastic › cephalic
- Idiot, idiocy › microcephalic (congenital)
- Nondevelopment › brain
- Undeveloped, undevelopment › brain
- Undeveloped, undevelopment › cerebral
- Absence › skull bone › with › microcephaly (of) (organ or part) (complete or partial)
Excludes1 — never code together
The conditions below can never be reported together with Q02 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- Meckel-Gruber syndrome (Q61.9)
Code first
The underlying condition below must be sequenced before Q02. Q02 describes a manifestation and cannot be the principal or first-listed diagnosis.
- , if applicable, congenital Zika virus disease
Includes
Conditions classified to Q02.
- hydromicrocephaly
- micrencephalon
Excludes2 — not included here — inherited from Chapter 17
The conditions below are not part of Q02, but a patient may have both at the same time. When documentation supports it, Q02 and the excluded code may both be reported.
- inborn errors of metabolism (E70-E88)
How long has Q02 existed?
Q02 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with Q02?
ICD-10-CM declares these codes mutually exclusive with Q02 — exactly one of each pair can be correct for a given encounter.