2027 ICD-10-CM Diagnosis Code Z99.12Encounter for respirator [ventilator] dependence during power failure
ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z99
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 211
- POA Exempt
Z99.12 is a billable ICD-10-CM diagnosis code for encounter for respirator [ventilator] dependence during power failure. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 3 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified encounters and counseling.
For Medicare Advantage risk adjustment, Z99.12 maps to CMS-HCC Category 211 (Respirator Dependence/Tracheostomy Status/Complications) under the V28 model, adding a risk factor of about 0.879 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Present on Admission (POA)Billing
Z99.12 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).
Medicare Risk Adjustment (HCC)Billing
Z99.12 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Z99.12: its own notes plus those printed at block Z77-Z99 and Chapter 21. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
- mechanical complication of respirator [ventilator] (J95.850)
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Notes
General instructions on how these codes are used.
- 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.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Z99.12, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Admission (for) See Also: Encounter (for);
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert Z99.12 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z99.12Overview
What is the ICD-10 code for encounter for respirator [ventilator] dependence during power failure?
The ICD-10-CM code for encounter for respirator [ventilator] dependence during power failure is Z99.12 (sometimes written as Z9912). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Z99.12 (Dependence on respirator) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report encounter for respirator [ventilator] dependence during power failure on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Z99.12 group to?
When encounter for respirator [ventilator] dependence during power failure is the principal diagnosis on an inpatient stay, it groups to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.
Is Z99.12 a CC or MCC?
CMS lists Z99.12 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 3 closely related codes in its exclusion list.
Is Z99.12 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for encounter for respirator [ventilator] dependence during power failure on inpatient claims. The code appears in the Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99) range of the CMS exempt list.
What HCC is Z99.12?
Z99.12 (encounter for respirator [ventilator] dependence during power failure) maps to CMS-HCC Category 211 (Respirator Dependence/Tracheostomy Status/Complications), commonly written as HCC 211, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 82 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does Z99.12 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, Z99.12 adds a risk adjustment factor of about 0.879 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.590 to 1.981 depending on the payment segment). HCC 211 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 211 category page.
