Pain management billing is one of the most technically demanding billing specialties in outpatient medicine. Every injection procedure has multiple code options depending on the spinal level, the approach technique, and whether fluoroscopy or CT guidance was used. Fluoroscopy billing has strict rules about when it can be billed separately and when it is already included in the procedure code. And virtually every pain management procedure requires prior authorization from commercial payers and Medicare Advantage plans.

Getting pain management billing wrong is expensive. A single error on a high-value procedure like a spinal cord stimulator trial can cost $1,500–$3,000 in denied revenue. This guide provides a complete reference for pain management CPT codes, fluoroscopy rules, bilateral procedure billing, and prior authorization best practices.

Epidural Steroid Injection CPT Codes

Epidural steroid injections (ESI) are billed differently depending on the anatomical approach used (interlaminar vs transforaminal) and the spinal region treated (cervical/thoracic vs lumbar/sacral). The approach must be clearly documented in the procedure note — using the wrong code for the documented approach is a coding error.

Interlaminar Epidural Injections

• 62320 — Injection, interlaminar epidural, cervical or thoracic — without imaging guidance
• 62321 — Injection, interlaminar epidural, cervical or thoracic — with imaging guidance (fluoroscopy or CT) — imaging is INCLUDED in this code
• 62322 — Injection, interlaminar epidural, lumbar or sacral — without imaging guidance
• 62323 — Injection, interlaminar epidural, lumbar or sacral — with imaging guidance — imaging is INCLUDED in this code

Transforaminal Epidural Injections

• 64479 — Transforaminal epidural injection, cervical or thoracic — single level
• 64480 — Transforaminal epidural injection, cervical or thoracic — each additional level (add-on to 64479)
• 64483 — Transforaminal epidural injection, lumbar or sacral — single level
• 64484 — Transforaminal epidural injection, lumbar or sacral — each additional level (add-on to 64483)

Facet Joint and Medial Branch Block CPT Codes

Facet joint injection codes are used for both facet joint injections (intra-articular) and medial branch blocks (peri-articular). The same code set is used for both — the distinction is captured in the documentation and the procedure note, not the code itself.

Cervical and Thoracic Facet/Medial Branch Codes

• 64490 — Injection, paravertebral facet joint or facet joint nerve, cervical or thoracic — single level
• 64491 — Cervical or thoracic facet — second level (add-on to 64490)
• 64492 — Cervical or thoracic facet — third and any additional levels (add-on, report once)

Lumbar and Sacral Facet/Medial Branch Codes

• 64493 — Injection, paravertebral facet joint or facet joint nerve, lumbar or sacral — single level
• 64494 — Lumbar or sacral facet — second level (add-on to 64493)
• 64495 — Lumbar or sacral facet — third and any additional levels (add-on, report once)

Radiofrequency Ablation (RFA) CPT Codes

Radiofrequency ablation (neurotomy) codes are used when thermal energy is used to ablate the medial branch nerves supplying the facet joints. These are distinct from the medial branch block codes and should not be confused. All RFA codes include imaging guidance.

Fluoroscopy Billing Rules — The Most Misunderstood Area of Pain Management Billing

Fluoroscopy guidance can be billed separately only when the procedure code does NOT already include imaging guidance. If the procedure code includes "with imaging guidance" in its description — or if the code inherently requires imaging to be performed correctly — you cannot bill a separate fluoroscopy code.

• 77002 — Fluoroscopic guidance for needle placement (use for procedures where imaging is not included and fluoroscopy was used)
• 77003 — Fluoroscopic guidance for spinal or paraspinal needle placement and/or injection

Bilateral Procedure Billing Rules

When pain management procedures are performed bilaterally on the same date of service — for example, bilateral lumbar facet injections — specific modifier rules apply. The billing approach depends on whether the procedure code is designated as a bilateral code or a unilateral code in the CMS fee schedule.

• For bilateral procedures on the same date: bill the code once with Modifier 50 (bilateral procedure)
• Medicare typically reimburses bilateral procedures at 150% of the single-side rate — NOT 200%
• Some commercial payers may reimburse at 200% for bilateral procedures — verify each payer's bilateral procedure policy
• Some payers require billing the procedure twice on separate lines with RT (right) and LT (left) modifiers instead of Modifier 50 — always verify payer requirements

Prior Authorization in Pain Management

Prior authorization is required for virtually every interventional pain management procedure by commercial payers and Medicare Advantage plans. Traditional Medicare Part B generally does not require prior authorization for most pain management procedures — but Medicare Advantage plans often require extensive prior auth even for routine injections.

Frequently Asked Questions