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A09 — HCPCS Level II Codes

A0998 Ambulance response and treatment, no transport billable
A0999 Unlisted ambulance service billable

ICD-10-CM and ICD-10-PCS are maintained by CMS/CDC-NCHS; HCPCS Level II by CMS — all public-domain US code sets. Data shown from release 2026Q3. This site is a reference tool, not medical or billing advice, and is not affiliated with or endorsed by CMS or any government agency.

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