HCPCS Modifier O

Physician’s Office (Only for ET3 Model Claims).


  • Submit this modifier to indicate the destination of an ambulance transport for an ET3 model ambulance claim when the location is a physician’s office  
  • Additional documentation may be required to support the need for this ambulance trip 


  • CMS Emergency Triage, Treat, and Transport (ET3) Model web page
  • CMS Ambulance website

Contact Palmetto GBA JM Part B Medicare

Email Part B

Contact a specific JM Part B department

Provider Contact Center: 855-696-0705

TDD: 866-830-3188

Other Palmetto GBA Sites

Palmetto GBA Home

DMEPOS Competitive Bidding Program

Jurisdiction J Part A MAC

Jurisdiction J Part B MAC

Jurisdiction M Part A MAC

Jurisdiction M Part B MAC

Jurisdiction M Home Health and Hospice MAC


National Supplier Clearinghouse MAC


RRB Specialty MAC Providers

RRB Specialty MAC Beneficiaries



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