G9318 – Imaging study named according to standardized nomenclature
HCPCS Level II code · G codes: Procedures / Professional Services (Temporary)
HCPCS codeG9318
- Long description
- Imaging study named according to standardized nomenclature
- Short description
- Image std nomenclature
- Pricing indicator
00Not separately priced by Part B (bundled, not covered or Part A only)- Medicare coverage
CCarrier judgment – coverage decided by the Medicare contractor- BETOS category
M5BSpecialist - psychiatry- Added
- January 1, 2014
- Last change
- January 1, 2014 – No change
Frequently asked questions
What is HCPCS code G9318?
G9318 is a HCPCS Level II code for imaging study named according to standardized nomenclature.
Does Medicare cover G9318?
The HCPCS file lists coverage code C: Carrier judgment – coverage decided by the Medicare contractor. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby G codes
- G9310 – Unplanned hospital readmission within 30 days of principal procedure
- G9311 – No surgical site infection
- G9312 – Surgical site infection
- G9313 – Amoxicillin, with or without clavulanate, not prescribed as first line antibiotic at the time of diagnosis for documented reason
- G9314 – Amoxicillin, with or without clavulanate, not prescribed as first line antibiotic at the time of diagnosis, reason not given
- G9315 – Amoxicillin, with or without clavulanate, prescribed as a first line antibiotic at the time of diagnosis
- G9316 – Documentation of patient-specific risk assessment with a risk calculator based on multi-institutional clinical data, the specific risk calculator used, and communication of risk assessment from risk calculator with the patient or family
- G9317 – Documentation of patient-specific risk assessment with a risk calculator based on multi-institutional clinical data, the specific risk calculator used, and communication of risk assessment from risk calculator with the patient or family not completed
- G9319 – Imaging study not named according to standardized nomenclature, reason not given
- G9320 – Documentation of medical reason(s) for not naming ct studies according to a standardized nomenclature provided (eg, ct studies performed for radiation treatment planning or image-guided radiation treatment delivery)
- G9321 – Count of previous ct (any type of ct) and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies documented in the 12-month period prior to the current study
- G9322 – Count of previous ct and cardiac nuclear medicine (myocardial perfusion or infarct avid imaging) studies not documented in the 12-month period prior to the current study, reason not given
- G9323 – Documentation of medical reason(s) for not counting previous ct and cardiac nuclear medicine (myocardial perfusion) studies (eg, ct studies performed for radiation treatment planning or image-guided radiation treatment delivery)
- G9324 – All necessary data elements not included, reason not given
- G9325 – Ct studies not reported to a radiation dose index registry due to medical reasons (eg, ct studies performed for radiation treatment planning or image-guided radiation treatment delivery)
- G9326 – Ct studies performed not reported to a radiation dose index registry that is capable of collecting at a minimum all necessary data elements, reason not given
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.