F4 HCPCS Level II modifier: Left hand, fifth digit
F4 is a HCPCS Level II modifier: “Left hand, fifth digit.” It adds this detail to the code it is reported with.
Official description
F4Left hand, fifth digit
HCPCS · United States
Medicare details
The indicators CMS publishes with F4 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Added
- Jan 1, 1995
Where F4 sits
- 1GroupHCPCS modifiers
- 2Modifier F4Left hand, fifth digit
Source and release
- Data release
- HCPCS Level II · October 2026
- Effective date
- Oct 1, 2026
- Publisher
- CMS
This page is built from the HCPCS Level II catalog that Vero Codes reads when it suggests codes: Centers for Medicare & Medicaid Services’s October 2026 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does HCPCS code F4 mean?
F4 is the HCPCS code for “Left hand, fifth digit” in CMS’s HCPCS Level II October 2026 release.
Where is F4 in the HCPCS Level II list?
F4 is listed under Modifiers.
Does Medicare cover F4?
CMS lists F4’s Medicare coverage as “Carrier judgment”. Coverage and payment still depend on the patient, the setting, the documentation and the payer.
Which HCPCS Level II release does this page use?
It uses CMS’s October 2026 release, in effect from Oct 1, 2026 to Dec 31, 2026. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.
Codes beside F4
All modifiersETEmergency servicesEXExpatriate beneficiaryEYNo physician or other licensed health care provider order for this item or serviceF1Left hand, second digitF2Left hand, third digitF3Left hand, fourth digitF5Right hand, thumbF6Right hand, second digitF7Right hand, third digitF8Right hand, fourth digitF9Right hand, fifth digitFALeft hand, thumb