Z99.12
Encounter for respirator [ventilator] dependence during power failure
Z99.12 (also written Z9912) is a billable ICD-10-CM diagnosis code for encounter for respirator [ventilator] dependence during power failure. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 7 codes in category Z99 (Dependence on enabling machines and devices, not elsewhere classified). The Alphabetic Index lists it under 2 entries. Its coding notes include a Code also instruction and 1 Excludes1 entry.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
A status code is not the same as a history code. It is not added when the diagnosis code already includes the status.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Also from chapter/block level (1 note)
- any follow-up examination (Z08-Z09)
Excludes1
Not coded here. The listed conditions generally should not be reported together.
- mechanical complication of respirator [ventilator] (J95.850)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Hospital CC
Counts as a complication or comorbidity (CC) when reported as a secondary diagnosis on an inpatient claim. It does not count when the principal diagnosis is one of the 3 codes in its exclusion list. Some MS-DRGs also ignore a CC or MCC that defines the DRG.
Source: CMS MS-DRG Definitions Manual v44, effective October 1, 2026, Appendix CIPF Comorbidity
On the CMS IPF comorbidity list.
| Comorbidity category | Factor |
|---|---|
| Chronic Obstructive Pulmonary Disease and Sleep Apnea | 1.09 |
Notes
Also from chapter/block level (3 notes)
- 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:
- (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.
- (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.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 2 entries