Z99.11
BillableDependence on respirator [ventilator] status
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is Z99.11 an HCC code?
Yes. Z99.11 maps to Respirator Dependence/Tracheostomy Status/Complications under the CMS-HCC V28 risk adjustment model (and Respirator Dependence/Tracheostomy Status under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for Z99.11
For Z99.11 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed Z99.11 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
Z99.11 is the ICD-10-CM diagnosis code for dependence on respirator [ventilator] status. A patient who requires a mechanical ventilator (breathing machine) to assist with or completely manage their breathing. Z99.11 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons with potential health hazards related to family and personal history and certain conditions influencing health status (z77-z99).
Under the CMS-HCC V28 risk adjustment model, Z99.11 maps to Respirator Dependence/Tracheostomy Status/Complications (HCC 211) with a community, non-dual, aged base RAF weight of 0.450. Under the older CMS-HCC V24 model, Z99.11 maps to Respirator Dependence/Tracheostomy Status (HCC 82) with a community, non-dual, aged base RAF weight of 1.241. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
This code indicates dependence on a ventilator; specify if it's full-time or part-time dependence. Because Z99.11 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z99.11 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code indicates dependence on a ventilator; specify if it's full-time or part-time dependence
- •Always code the underlying condition requiring ventilator support in addition to this status code
Clinical Significance
This code represents complete dependence on mechanical ventilation for breathing, indicating severe respiratory compromise with extremely high mortality risk and intensive care needs. These patients require 24/7 monitoring, specialized nursing care, and complex respiratory management protocols.
Documentation Requirements
- ✓Confirmation of ventilator dependence for breathing
- ✓Type of ventilatory support (invasive vs non-invasive)
- ✓Ventilator settings and parameters
- ✓Tracheostomy status if applicable
- ✓Duration of ventilator dependence
- ✓Weaning attempts or prognosis
- ✓Respiratory therapy requirements
- ✓Underlying condition requiring ventilation