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FY2027 ICD-10-CM reference

Q02: Microcephaly

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Microcephaly. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Billable code. Verified against the official FY2027 order file.

Oct to Dec 2026, PY2027

CMS-HCC V28

Mapped
  • HCC 182Spinal Cord Disorders/InjuriesCoefficient 0.478 (CNA, PY2027)

CMS-HCC V24

Not used by CMS

ESRD

Mapped
  • HCC 72Spinal Cord Disorders/InjuriesCoefficient 0.099 (Dialysis CE, PY2027)

RxHCC

Mapped
  • HCC 155Spinal Cord DisordersCoefficient 0.054 (MA-PD CE non-low aged, PY2027)

PACE (CMS-HCC V22 component)

Mapped
  • HCC 72Spinal Cord Disorders/Injuries

PACE ESRD (ESRD V21 component)

Mapped
  • HCC 72Spinal Cord Disorders/Injuries

PACE RxHCC (2018/2019 component)

Mapped
  • HCC 155Spinal Cord Disorders

Jan to Sep 2027, PY2028

CMS-HCC V28

Not published by CMS

CMS-HCC V24

Not published by CMS

ESRD

Not published by CMS

RxHCC

Not published by CMS

PACE (CMS-HCC V22 component)

Not published by CMS

PACE ESRD (ESRD V21 component)

Not published by CMS

PACE RxHCC component

Not published by CMS

Oct to Dec 2026, BY2026

HHS-HCC

Pending

Jan to Sep 2027, BY2027

HHS-HCC

Not published by CMS

FY2027 Tabular instructions

Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.

Instructional note

Codes from this chapter are not for use on maternal records

Source: Q00-QA1 (chapter, inherited).

Excludes2

inborn errors of metabolism (E70-E88)

Source: Q00-QA1 (chapter, inherited).

Includes

hydromicrocephaly

Source: Q02 (category, direct).

Includes

micrencephalon

Source: Q02 (category, direct).

Code first

, if applicable, congenital Zika virus disease

Source: Q02 (category, direct).

Excludes1

Meckel-Gruber syndrome (Q61.9)

Source: Q02 (category, direct).

Source: CMS FY2027 Tabular List and Alphabetic Index.

Open Tabular instructions and code details

Compare the FY2027 additions, removals and billable-status changes

What does Q02 mean in FY2027?

The official ICD-10-CM descriptor is Microcephaly. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is Q02 billable in FY2027?

The FY2027 order file marks Q02 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does Q02 map to an HCC?

Oct to Dec 2026, PY2027: CMS-HCC V28 HCC 182 (Spinal Cord Disorders/Injuries); CMS-HCC V24: Not used by CMS; ESRD HCC 72 (Spinal Cord Disorders/Injuries); RxHCC HCC 155 (Spinal Cord Disorders). Jan to Sep 2027, PY2028: CMS-HCC V28: Not published by CMS; CMS-HCC V24: Not published by CMS; ESRD: Not published by CMS; RxHCC: Not published by CMS. Oct to Dec 2026, BY2026: HHS-HCC: Pending. Jan to Sep 2027, BY2027: HHS-HCC: Not published by CMS. Base coefficients are reference values, not a member total.

Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.

Review the FY2026 April edition