G9959 HCPCS Level II code: Systemic antimicrobials not prescribed
G9959 is the HCPCS code for “Systemic antimicrobials not prescribed” in CMS’s October 2026 release, in effect from Oct 1, 2026.
Official description
G9959Systemic antimicrobials not prescribed
Short description: Systemic antimicro not presc
HCPCS · United States
Medicare details
The indicators CMS publishes with G9959 in its October 2026 file. They describe Medicare’s handling, not another payer’s.
- Medicare coverage
- Carrier judgment
- Medicare pricing
- Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)
- Type of service
- Medical care
- BETOS category
- Undefined codes
- Added
- Jan 1, 2018
Where G9959 sits
- 1G codesProcedures and professional services
- 2Active code G9959Systemic antimicrobials not prescribed
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 G9959 mean?
G9959 is the HCPCS code for “Systemic antimicrobials not prescribed” in CMS’s HCPCS Level II October 2026 release.
Does Medicare cover G9959?
CMS lists G9959’s Medicare coverage as “Carrier judgment” and its pricing as “Service not separately priced by Part B (e.g., services not covered, bundled, used by Part A only, etc.)”. 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 G9959
All G codesG9949Leg pain was not measured by the visual analog scale (vas) or numeric pain scale at three months (6 - 20 weeks) postoperativelyG9954Patient exhibits 2 or more risk factors for post-operative vomitingG9955Cases in which an inhalational anesthetic is used only for inductionG9956Patient received combination therapy consisting of at least two prophylactic pharmacologic anti-emetic agents of different classes preoperatively and/or intraoperativelyG9957Documentation of medical reason for not receiving combination therapy consisting of at least two prophylactic pharmacologic anti-emetic agents of different classes preoperatively…G9958Patient did not receive combination therapy consisting of at least two prophylactic pharmacologic anti-emetic agents of different classes preoperatively and/or intraoperativelyG9960Documentation of medical reason(s) for prescribing systemic antimicrobialsG9961Systemic antimicrobials prescribedG9962Embolization endpoints are documented separately for each embolized vessel and ovarian artery angiography or embolization performed in the presence of variant uterine artery…G9963Embolization endpoints are not documented separately for each embolized vessel or ovarian artery angiography or embolization not performed in the presence of variant uterine…G9964Patient received at least one well-child visit with a pcp during the performance periodG9965Patient did not receive at least one well-child visit with a pcp during the performance period