T1021 HCPCS Code: Home health aide or certified nurse assistant (Units, EVV, Rates, Denials)
T1021: Home health aide or certified nurse assistant, per visit. Billing unit, which services it covers, modifiers, whether EVV applies, typical rate notes by state and the common denial reasons.
T1021 is “Home health aide or certified nurse assistant, per visit.” It is billed per visit and covers a home health aide visit, usually under a Medicaid home health plan of care. Medicare does not pay it. EVV applies: the 21st Century Cures Act required states to use EVV for Medicaid home health services by January 1, 2023, and some states had a one-year extension.
Units and rounding
One unit is one visit, whatever its length, within the visit frequency on the plan of care.
Modifiers you will see
- U1–U9: State-defined; often distinguish programs (waiver vs state plan), service levels or provider types
Modifier meanings are set by each state and payer, so check your provider manual. See home care billing modifiers.
Typical rates
Per-visit rates are set per state program and managed-care plan. Each state program and managed-care plan sets its own rate, so use your state’s current fee schedule.
Common denial reasons
- No current plan of care or physician order
- Visits exceed the ordered frequency
- Visit not verified by EVV
- Duplicate visit on the same date
Related codes
- G0156: Services of home health/hospice aide in home health or hospice settings, each 15 minutes
- S9122: Home health aide or certified nurse assistant, providing care in the home; per hour
- T1019: Personal care services, per 15 minutes
Source
CMS HCPCS Level II code set (quarterly update). Confirm the exact descriptor and any state-specific unit definition in your payer’s billing manual. Last reviewed November 6, 2026.
General information, not billing or legal advice. Check your state Medicaid agency’s current fee schedule and provider manual.