ICD-10 · PDGM grouping
Z99 Dependence on enabling machines and devices, not elsewhere classified
All 7 codes in the Z99 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
7
Can lead a claim
2
Cannot lead a claim
5
What CMS assigns to Z99
2 of the 7 codes group to MMTA - Other (1) and Complex Nursing Interventions (1); 5 are assigned no clinical group. None of the 7 is assigned a comorbidity subgroup. 2 of the 7 can lead a claim. CMS attaches a code-first note to 1 of the 7.
Code first
CMS grouper convention 183, on Z99.3. Code first:
- cause of dependence, such as:
- muscular dystrophy (G71.0-)
- obesity (E66.-)
Every code in Z99
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| Z99.0 | Dependence on aspirator | Can lead a claim | A | None |
| Z99.1 Dependence on respirator | ||||
| Z99.11 | Dependence on respirator [ventilator] status | Can lead a claim | D | None |
| Z99.12 | Encounter for respirator [ventilator] dependence during power failureCMS: Encounter for respirator dependence during power failure | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z99.2 | Dependence on renal dialysis | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z99.3 | Dependence on wheelchair | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z99.8 Dependence on other enabling machines and devices | ||||
| Z99.81 | Dependence on supplemental oxygen | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z99.89 | Dependence on other enabling machines and devices | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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