FY2027 ICD-10-CM reference
Z99: Dependence on enabling machines and devices, not elsewhere classified
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Dependence on enabling machines and devices, not elsewhere classified. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
Oct to Dec 2026, PY2027
CMS-HCC V28
Not applicableCMS-HCC V24
Not applicableESRD
Not applicableRxHCC
Not applicablePACE (CMS-HCC V22 component)
Not applicablePACE ESRD (ESRD V21 component)
Not applicablePACE RxHCC (2018/2019 component)
Not applicableJan to Sep 2027, PY2028
CMS-HCC V28
Not applicableCMS-HCC V24
Not applicableESRD
Not applicableRxHCC
Not applicablePACE (CMS-HCC V22 component)
Not applicablePACE ESRD (ESRD V21 component)
Not applicablePACE RxHCC component
Not applicableOct to Dec 2026, BY2026
HHS-HCC
Not applicableJan to Sep 2027, BY2027
HHS-HCC
Not applicableMore specific FY2027 codes
- Z99.0: Dependence on aspiratorBillable code
- Z99.1: Dependence on respiratorNonbillable heading
- Z99.2: Dependence on renal dialysisBillable code
- Z99.3: Dependence on wheelchairBillable code
- Z99.8: Dependence on other enabling machines and devicesNonbillable heading
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
Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
Source: Z00-Z99 (chapter, inherited).
Instructional note
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
Source: Z00-Z99 (chapter, inherited).
Instructional note
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.
Source: Z00-Z99 (chapter, inherited).
Code also
any follow-up examination (Z08-Z09)
Source: Z77-Z99 (section, inherited).
Compare the FY2027 additions, removals and billable-status changes
What does Z99 mean in FY2027?
The official ICD-10-CM descriptor is Dependence on enabling machines and devices, not elsewhere classified. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is Z99 billable in FY2027?
The FY2027 order file marks Z99 as a nonbillable heading. Select a complete billable child code.
Does Z99 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
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