G-Code
HCPCS Level II codes (G0000-G9999) for procedures and services that do not have CPT codes — primarily Medicare temporary or Medicare-specific services.
1 min read · Last reviewed May 23, 2026
At a glance
- Category
- Billing
- Primary sources
- 1
- Workspace handoff
- ask d3 →
Where this comes up
This shows up in revenue-cycle work — claim scrubbing, charge entry, posting, A/R follow-up, and month-end close. Billers and practice managers hit this term when reconciling a payment, working a denial queue, or auditing why a claim aged past 60 days.
Full definition
What it is in practice
CMS HCPCS uses G-codes for Medicare-specific services (G0438 IPPE, G0439 AWV, G2211, G2212). Many G-codes have no commercial-payer equivalent.
How it shows up in your practice
Confirm payer-specific acceptance of G-codes before billing non-Medicare payers. Commercial payers often want the corresponding CPT instead.
Sources
- CMS — HCPCS Level IIhttps://www.cms.gov/medicare/coding-billing/healthcare-common-procedure-system-hcpcs-level-ii-coding-procedures
Look up G-codes in Ask D3
Open ask d3 →Related terms
- BillingHCPCS Level IIThe CMS-maintained code set covering products, supplies, and services not included in CPT — primarily durable medical equipment, drugs, and Medicare-specific services.
- BillingG2211 (Visit Complexity Add-on)Medicare HCPCS add-on code recognizing the visit complexity inherent to evaluation and management services associated with primary care and certain longitudinal care.
- BillingAnnual Wellness Visit (AWV)A Medicare-covered preventive visit (G0438 initial, G0439 subsequent) focused on personalized prevention plans.
- BillingInitial Preventive Physical (IPPE / Welcome to Medicare)One-time Medicare preventive visit (G0402) furnished within 12 months of Part B enrollment.
D3rx is a healthcare-billing and compliance research aid maintained by D3rx Inc. Articles are drafted by an LLM (Anthropic Claude) against primary HHS, OCR, CMS, eCFR, NIST, and state-regulator publications, and reviewed for restraint and source fidelity by the D3rx team.
Reviewer status: a named credentialed reviewer (CHC, CHPC, or healthcare attorney) is being engaged. Until that engagement is finalized, this page does not claim credentialed review.
Related across the archive
- GlossaryHCPCS Level IIThe CMS-maintained code set covering products, supplies, and services not included in CPT — primarily durable medical equipment, drugs, and Medicare-specific services.
- GlossaryAnnual Wellness Visit (AWV)A Medicare-covered preventive visit (G0438 initial, G0439 subsequent) focused on personalized prevention plans.
- GlossaryG2211 (Visit Complexity Add-on)Medicare HCPCS add-on code recognizing the visit complexity inherent to evaluation and management services associated with primary care and certain longitudinal care.
- GlossaryInitial Preventive Physical (IPPE / Welcome to Medicare)One-time Medicare preventive visit (G0402) furnished within 12 months of Part B enrollment.
- GlossaryJ-CodeHCPCS Level II codes (J0000-J9999) used to bill drugs administered other than by oral method.
- GlossaryModifier JWHCPCS modifier indicating drug amount discarded from a single-use vial or single-use package.
- GlossaryModifier RT / LTHCPCS modifiers identifying procedures performed on the right (RT) or left (LT) side of the body.
- BillingAWV + Problem Visit Same Day: How to Bill CorrectlyYes, you can bill AWV and a problem visit the same day. Here's how to do it correctly with modifier -25.
This glossary entry is a research aid for billing and compliance staff. It does not provide legal, medical, or financial advice and does not replace counsel. References cited link to primary sources at HHS, OCR, CMS, eCFR, NIST, and the relevant payer or industry body.