Q4390Temporary Codes

Ascendion, per square centimeter (add-on, list separately in addition to

Short description: Ascendion per sq cm

Effective date: January 1, 2026
Termination date: —

Related codes (Q-series)

Q0035Cardiokymography Q0081Infusion ther other than che Q0083Chemo by other than infusion Q0084Chemotherapy by infusion Q0085Chemo by both infusion and o Q0091Obtaining screen pap smear Q0092Set up port xray equipment Q0111Wet mounts/ w preparations Q0112Potassium hydroxide preps Q0113Pinworm examinations Q0114Fern test Q0115Post-coital mucous exam

Frequently asked questions

What is HCPCS code Q4390?

Q4390 is a HCPCS Level II code for Ascendion, per square centimeter (add-on, list separately in addition to.

What category is HCPCS code Q4390 in?

Q4390 falls under the Temporary Codes category of HCPCS Level II.

When did HCPCS code Q4390 become effective?

Q4390 has been effective since January 1, 2026, per CMS's quarterly HCPCS update.

HCPCS Level II data from CMS (public domain). HCPCS Level I (CPT) codes are not included — CPT is copyrighted by the American Medical Association. Always verify codes with authoritative sources before making coding or billing decisions.