Neurodiagnostics Billing (EEG, EMG)

Neurodiagnostic billing turns on counting. An EEG is billed by recording length. A nerve conduction study is billed by how many nerves were tested. Needle EMG is billed by limb or muscle group. Small counting errors can change both coding and payment, and payers watch these claims closely.

The tests are often done together, so bundling edits are common. A study that is correct clinically can still deny if the code mix does not match payer edits. Westmont connects neurology practices, hospital neurodiagnostic labs, and independent testing providers with vetted billing experts who know how to count studies, document them, and respond to payer review.

Who this is for

• Neurology practices that run EEG and EMG in the office
• Hospital neurodiagnostic labs and epilepsy monitoring units
• Physical medicine and rehabilitation practices performing EMG and nerve studies
• Independent diagnostic testing providers
• Mobile EEG and neurodiagnostic services
• Pain and spine practices that include electrodiagnostic testing

What gets billed

• Routine EEG recordings in different states, such as awake or asleep
• Extended EEG recordings
• Nerve conduction studies, counted by number of nerves tested
• Needle EMG by limb
• Add-on EMG services tied to nerve conduction studies
• Neuromuscular junction testing
• Evoked potential studies
• Technical component for equipment and technologist time
• Professional interpretation and report

Commonly billed codes

Code	Type	What it covers
95816	CPT	Routine EEG with awake and drowsy recording
95819	CPT	Routine EEG with awake and asleep recording
95812	CPT	Extended EEG recording, 41 to 60 minutes
95813	CPT	Extended EEG recording, over 60 minutes
95907	CPT	Nerve conduction studies, 1 to 2 studies
95909	CPT	Nerve conduction studies, 5 to 6 studies
95913	CPT	Nerve conduction studies, 13 or more studies
95860	CPT	Needle EMG of one limb
95861	CPT	Needle EMG of two limbs
95886	CPT	Add-on needle EMG with nerve conduction, each limb, with testing and interpretation
G40.909	ICD-10-CM	Epilepsy, unspecified, not intractable
G56.00	ICD-10-CM	Carpal tunnel syndrome, unspecified upper limb
G62.9	ICD-10-CM	Polyneuropathy, unspecified

Note

Codes are examples for orientation, not a complete list, and do not guarantee coverage or payment. Always check current code sets and payer policy.

Billing challenges in neurodiagnostics

• Counting nerve conduction studies. The total depends on how many separate nerve studies were done, and each payer may cap units per diagnosis. Billers count from the report, not just the order, and compare to payer limits.
• Needle EMG and add-on coding. When needle EMG is done with nerve conduction, the add-on code is generally used instead of older limb-based codes. Billers apply current CPT guidance and payer edits.
• Documentation of time. EEG codes depend on recording duration. Billers confirm start and stop times in the technologist log and the report.
• Technical and professional splits. Equipment may be owned by a hospital while a physician reads the study. Billers confirm who bills what and use modifiers 26 and TC where required.
• Medical necessity. Many payers link tests to specific symptoms or diagnoses. Billers review the order for a clear reason and check for payer policies on testing for common conditions.
• Qualified performers. Some payers have rules about who may perform or supervise tests, and about physician training. Billers keep enrollment and provider credentials in order.
• Long-term and ambulatory EEG. Prolonged monitoring uses a different set of codes and billing rules. Billers track code updates, since these codes changed in recent years, and confirm vendor roles.

How Westmont can help

• Match your practice with vetted billing experts experienced in EEG, EMG, and nerve testing
• Support end-to-end revenue cycle work, from order intake to payment posting
• Help with denial management and appeals tied to unit counts and medical necessity
• Assist with credentialing and payer enrollment
• Review how technical and professional components are billed

Frequently asked questions

How are EMG and nerve conduction studies billed?

Nerve conduction studies are billed by the number of studies done, grouped in ranges. Needle EMG is billed by limb or with an add-on when done with nerve conduction. Each claim should reflect the report, with a diagnosis that supports the testing. Check payer limits on units per diagnosis.

Why are nerve conduction claims denied?

Common reasons are too many units for the diagnosis, documentation that does not match the codes, and bundling with other services. Payers also review testing that appears routine. Clear reports and consistent counting help support the claim.

What changed for EEG billing in recent years?

CPT updated several EEG codes, especially for long-term and video monitoring. Billers should review the current code set each year, since descriptions and rules can change. Check AMA and payer updates before using older codes.

Can a neurology practice bill both the technical and professional parts?

Yes, when the practice owns the equipment, employs the technologist, and the physician interprets the study, a global claim is common. If a hospital owns the equipment, the split changes. Rules differ by payer, so confirm before billing.

Do EEG or EMG tests need prior authorization?

Some payers require it, especially for extended or long-term monitoring and in certain settings. Requirements vary and change. Check payer lists regularly and ask your billing partner to track authorizations.

Related billing services

• Neurology Billing
• Sleep Study Center Billing
• Neurosurgery Billing
• PM&R Billing
• Pain Management Billing
• Sleep Medicine Billing