0509T Pattern erg with i & r
Also known as: Pattern ERG, Steady-state pattern ERG
Pattern electroretinography with interpretation and report.
In Plain Language
Eye electrical response test; Retinal nerve function check
Clinical Context
Used to assess function of retinal ganglion cells in conditions such as glaucoma, optic neuropathy, or retinal pathology. Provides objective measure of macular and optic nerve function.
RVU Breakdown
| Work RVU | 0.39 |
| Total RVU | 0.39 |
Est. Medicare Payment
National estimate based on 2026 CMS PFS Conversion Factor ($33.40). Actual payment varies by locality (GPCI adjustment).
Billing & Documentation
Category III codes are temporary codes for emerging technology, services, and procedures. They are not assigned RVU values by CMS. Coverage and reimbursement vary by payer — check with individual insurers before billing. These codes sunset after 5 years if not converted to Category I.
Specialties
Frequently Asked Questions
What is CPT code 0509T?
CPT 0509T (Pattern erg with i & r) is a Category III code. Pattern electroretinography with interpretation and report.
Is 0509T a permanent CPT code?
No — 0509T is a Category III temporary code for emerging technology. It may be converted to a permanent Category I code if widely adopted. Category III codes expire after 5 years without renewal.
When is CPT 0509T used?
Used to assess function of retinal ganglion cells in conditions such as glaucoma, optic neuropathy, or retinal pathology. Provides objective measure of macular and optic nerve function.
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CPT® is a registered trademark of the American Medical Association. Data sourced from CMS Physician Fee Schedule RVU26A. Descriptions, synonyms, and clinical context are original content by RVU Edge.