HCPCS Level II · Miscellaneous services (temporary codes)
Q4390Ascendion, per square centimeter (add-on, list separately in addition to primary procedure)
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Source: CMS HCPCS quarterly update, October 2026. Page updated September 29, 2026.
About Q4390
Q4390 is an HCPCS Level II code in the Q series (miscellaneous services (temporary codes)), describing ascendion, per square centimeter (add-on, list separately in addition to primary procedure).
It was added to HCPCS effective 10/01/2025, and its current record took effect 01/01/2026.
Its Medicare coverage code is "C", meaning coverage is left to the Medicare contractor's judgment.
Details
- Short description
- Ascendion per sq cm
- Date added
- 10/01/2025
- Action effective
- 01/01/2026
- BETOS
- O1E
Related Q43xx codes
- Q4300Acesso tl, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4301Activate matrix, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4302Complete aca, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4303Complete aa, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4304Grafix plus, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4305American amnion ac tri-layer, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4306American amnion ac, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4307American amnion, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4308Sanopellis, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4309Via matrix, per square centimeter (add-on, list separately in addition to primary procedure)
- Q4310Procenta, per 100 mg
- Q4311Acesso, per square centimeter (add-on, list separately in addition to primary procedure)
Common questions about Q4390
Is HCPCS Q4390 still valid?
- Yes. Q4390 is active in the CMS October 2026 HCPCS file.
Does Medicare cover Q4390?
- Its coverage code is "C": coverage is left to the Medicare contractor's judgment. Check the local coverage determination for your region.