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
Medicare Coverage & Payment
- CMS short descriptor: Aor ane 5.5-5.9 cm max diam
- Medicare coverage: Carrier judgment (CMS coverage code C)
- Payment category: Service not separately priced (pricing indicator 00)
- BETOS: Z2 — Undefined codes
- Last CMS action effective: January 1, 2016
Source: CMS HCPCS Level II release. Coverage codes indicate how Medicare treats the code, not whether a specific claim will be paid; payer policy and documentation still govern.
Contextual Map
Every relationship of G9598 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.
Nearest codes (40)
- G9540 — Patient alive 3 months post procedure[Sibling]— CMS HCPCS Level II code set
- G9541 — Filter removed within 3 months of placement[Sibling]— CMS HCPCS Level II code set
- G9542 — Documented re-assessment for the appropriateness of filter removal within 3 months of placement[Sibling]— CMS HCPCS Level II code set
- G9543 — Documentation of at least two attempts to reach the patient to arrange a clinical re-assessment for the appropriateness of filter removal within 3 months of placement[Sibling]— CMS HCPCS Level II code set
- G9544 — Patients that do not have the filter removed, documented re-assessment for the appropriateness of filter removal, or documentation of at least two attempts to reach the patient to arrange a clinical re-assessment for the appropriateness of filter removal within 3 months of placement[Sibling]— CMS HCPCS Level II code set
- G9547 — Cystic renal lesion that is simple appearing (bosniak i or ii) , or adrenal lesion less than or equal to 1.0 cm or adrenal lesion greater than 1.0 cm but less than or equal to 4.0 cm classified as likely benign by unenhanced ct or washout protocol ct, or mri with in- and opposed-phase sequences or other equivalent institutional imaging protocols[Sibling]— CMS HCPCS Level II code set
- G9548 — Final reports for imaging studies stating no follow-up imaging is recommended[Sibling]— CMS HCPCS Level II code set
- G9549 — Documentation of medical reason(s) that follow-up imaging is indicated (e.g., patient has lymphadenopathy, signs of metastasis or an active diagnosis or history of cancer, and other medical reason(s))[Sibling]— CMS HCPCS Level II code set
- and 32 more
Change history
- January 1, 2016 — Added to the code set [Change history]— CMS release files (code change ledger)
Sources for this page
Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.
- Code, descriptors, coverage and pricing attributes Official source data
- CMS HCPCS Alpha-Numeric (ANWEB) release — July 2026 quarterly update Release, file and checksum · Publisher’s page
- Change history and date-of-service validity Official source data
- CMS HCPCS quarterly update files, ingested into the change ledger Release, file and checksum · Publisher’s page
- Comparisons, relationships and the contextual map MedCoder structured relationship
- Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
- Summary and FAQ answers MedCoder explanation
- Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.
Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates
Change history
- January 1, 2016Added to the code setAortic aneurysm 5.5 - 5.9 cm maximum diameter on centerline formatted ct or minor diameter on axial formatted ct
Nearest Codes in This Family
Official HCPCS Level II classifications closest to G9598 in its code family, with their registry titles.
- G9582 — Door to puncture time of greater than 90 minutes, no reason given
- G9583 — Patients prescribed opiates for longer than six weeks
- G9584 — Patient evaluated for risk of misuse of opiates by using a brief validated instrument (e.g., opioid risk tool, soapp-r) or patient interviewed at least once during opioid therapy
- G9585 — Patient 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 therapy
- G9593 — Pediatric patient with minor blunt head trauma classified as low risk according to the pecarn prediction rules
- G9594 — Patient presented with a minor blunt head trauma and had a head ct ordered for trauma by an emergency care provider
- G9595 — Patient has documentation of ventricular shunt, brain tumor, or coagulopathy
- G9596 — Pediatric patient had a head ct for trauma ordered by someone other than an emergency care provider or was ordered for a reason other than trauma
- G9597 — Pediatric patient with minor blunt head trauma not classified as low risk according to the pecarn prediction rules
- G9599 — Aortic aneurysm 6.0 cm or greater maximum diameter on centerline formatted ct or minor diameter on axial formatted ct