M1399Medical Services
Patients who leave the practice during the follow-up period
Short description: Pt lve prac
- Effective date
- January 1, 2025
- Termination date
- —
Related codes (M-series)
M0001Advancing cancer care mvpM0002Opt care kidney hlth mvpM0003Opt care episod neuro mvpM0004Qual care neurologic cnd mvpM0005Value in primary care mvpM0010Eom meos paymentM0064Visit for drug monitoringM0075Cellular therapyM0076ProlotherapyM0100Intragastric hypothermiaM0201Pne flu hepb cov home adminM0220Tixagev and cilgav inj
Frequently asked questions
What is HCPCS code M1399?
M1399 is a HCPCS Level II code for Patients who leave the practice during the follow-up period.
What category is HCPCS code M1399 in?
M1399 falls under the Medical Services category of HCPCS Level II.
When did HCPCS code M1399 become effective?
M1399 has been effective since January 1, 2025, 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.