G9598 HCPCS Level II code: Aortic aneurysm 5.5 - 5.9 cm maximum diameter on centerline formatted ct or minor diameter on axial formatted ct
G9598 is the HCPCS code for “Aortic aneurysm 5.5 - 5.9 cm maximum diameter on centerline formatted ct or minor diameter on axial formatted ct” in CMS’s October 2026 release, in effect from Oct 1, 2026.
Official description
G9598Aortic aneurysm 5.5 - 5.9 cm maximum diameter on centerline formatted ct or minor diameter on axial formatted ct
Short description: Aor ane 5.5-5.9 cm max diam
HCPCS · United States
Medicare details
The indicators CMS publishes with G9598 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, 2016
Where G9598 sits
- 1G codesProcedures and professional services
- 2Active code G9598Aortic aneurysm 5.5 - 5.9 cm maximum diameter on centerline formatted ct or minor diameter on axial formatted ct
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 G9598 mean?
G9598 is the HCPCS code for “Aortic aneurysm 5.5 - 5.9 cm maximum diameter on centerline formatted ct or minor diameter on axial formatted ct” in CMS’s HCPCS Level II October 2026 release.
Does Medicare cover G9598?
CMS lists G9598’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 G9598
All G codesG9585Patient not evaluated for risk of misuse of opiates by using a brief validated instrument (e.g., opioid risk tool, soapp-r) or patient not interviewed at least once during opioid…G9593Pediatric patient with minor blunt head trauma classified as low risk according to the pecarn prediction rulesG9594Patient presented with a minor blunt head trauma and had a head ct ordered for trauma by an emergency care providerG9595Patient has documentation of ventricular shunt, brain tumor, or coagulopathyG9596Pediatric patient had a head ct for trauma ordered by someone other than an emergency care provider or was ordered for a reason other than traumaG9597Pediatric patient with minor blunt head trauma not classified as low risk according to the pecarn prediction rulesG9599Aortic aneurysm 6.0 cm or greater maximum diameter on centerline formatted ct or minor diameter on axial formatted ctG9600Symptomatic aaas that required urgent/emergent (non-elective) repairG9601Patient discharge to home no later than post-operative day #7G9602Patient not discharged to home by post-operative day #7G9603Patient survey score improved from baseline following treatmentG9604Patient survey results not available