Neurology Medical Billing: The Complete Guide for Practices

Your billing manager pulls the aging report on a Friday afternoon. The EMG claims from three weeks ago are still sitting there. Two EEGs came back denied for medical necessity. An infusion claim bounced because the diagnosis code didn't match the one on the authorization. None of these were clinical mistakes. Every one of them was a billing problem.

That's neurology medical billing in a nutshell. The care is complex, so the coding is complex, and payers know exactly where to push back. This guide walks through where neurology claims break, what's changing in 2026 and 2027, and how to decide whether to keep billing in house or bring in help.

Why Neurology Claims Break in the Same Places

Most specialties have one or two tricky code families. Neurology has several, and they often land on the same visit. One day can include a high-complexity E/M visit, a nerve conduction study across multiple nerves, and needle EMG. Each piece has its own documentation rules, modifiers, and bundling edits.

If denials feel worse than they used to, you're not imagining it. Experian Health's 2025 State of Claims survey found that 41% of providers now see denial rates of 10% or higher, up from 38% the year before. Becker's Hospital Review reported that missing or inaccurate claim data drove half of those denials, and authorization problems drove 35%. Neurology gets hit hard by both.

The Codes That Carry Your Revenue

Here's where most neurology revenue lives, and where it most often leaks.

• Routine and long-term EEG. Routine EEG codes (95812 through 95822) and long-term monitoring codes (95700 through 95726) need documentation that shows why the study was ordered. When the technical and professional work are split, modifiers 26 and TC have to be applied correctly.
• Nerve conduction studies and needle EMG. NCS codes 95907 through 95913 are billed by the number of studies, not the number of nerves. When needle EMG happens at the same session, it's reported with add-on codes 95885 through 95887. Billing standalone EMG codes alongside NCS is one of the most common bundling errors.
• Botox for chronic migraine. The injection (64615) and the drug (J0585, billed per unit) go out together. Payers usually want proof of chronic migraine and failed preventive treatments first. Discarded drug from a single-dose vial goes on its own line with the JW modifier.
• MS and other infusions. Infusion administration (96365 and 96366) plus the drug code. These are high-dollar claims, so a small diagnosis or authorization mismatch costs real money.
• E/M visits on procedure days. A separately identifiable visit on the same day as a procedure needs modifier 25 and documentation that stands on its own.

For a closer look at the patterns behind these errors, see our breakdown of the five denial triggers neurology practices see most.

The MS Code Change That's Still Causing Denials

On October 1, 2025, the old catch-all code G35 stopped being billable. The FY2026 ICD-10-CM update replaced it with codes for each type of MS. That includes G35.A for relapsing-remitting MS, the G35.B codes for primary progressive MS, the G35.C codes for secondary progressive MS, and G35.D for unspecified MS.

Two things trip practices up. First, the physician has to document the MS type and whether it's active. A coder can't add that after the fact. Second, the code on the claim has to match the code on the prior authorization. If an infusion was authorized under the old code and the claim goes out with the new one, expect pushback. CMS publishes the full ICD-10 code set if you want to check your templates.

The 40 Requests a Week Problem

Prior authorization is the part of neurology billing that wears your staff down. MRIs, video EEG, EMG, Botox, and infusions all tend to need approval first.

The AMA's 2025 prior authorization survey found physicians complete about 40 prior authorizations a week. That workload eats roughly 13 hours of physician and staff time. Neurologists feel it too. In a 2026 comment letter to CMS, the American Academy of Neurology called prior authorization burden one of its members' top concerns.

There is some relief. Under the CMS Interoperability and Prior Authorization Final Rule, Medicare Advantage and Medicaid plans have had to answer urgent requests within 72 hours since January 1, 2026. Standard requests get 7 calendar days. They also have to give a specific reason when they deny. By January 1, 2027, those plans must offer electronic prior authorization APIs.

That only helps if someone on your team is watching the clock. For practical ways to speed things up, read Prior Authorization in Neurology: Cutting MRI, EEG, EMG Delays.

What a 1.68% Cut Really Costs You

In July, CMS proposed the 2027 Medicare physician fee schedule. For most physicians, the conversion factor would drop 1.68%, from $33.40 to $32.84, according to the CMS fact sheet.

That sounds small. But it applies to every Medicare service you bill, and many neurology practices treat a large share of Medicare patients. CMS usually finalizes the rule in early November, so the numbers may still change before January.

You can't change the fee schedule. You can make sure you collect every dollar it still pays. Our 2027 Medicare Impact Calculator estimates your change using your own codes in about two minutes. For the full picture, read 2027 Medicare Fee Cuts: Can Your Practice Revenue Take the Hit?

Should You Keep Neurology Billing In House?

There's no single right answer. It depends on your volume, your staff, and how much time your team spends fixing claims instead of sending them.

• Keep it in house if your team is stable and specialized. You have coders who know neurology, low turnover, and software that catches errors before claims go out.
• Outsource if you're short-staffed or losing ground. If denials are climbing, A/R is aging past 90 days, or one person holds all the billing knowledge, a dedicated billing team protects you.
• Consider a hybrid model. Some practices keep scheduling and eligibility in house and outsource coding, follow-up, and appeals.
• Check your software either way. In house or outsourced, your neurology EHR and practice management system decide how clean your claims are before anyone touches them.

What Practices That Get Paid Do Differently

Whoever does the work, these habits separate practices that get paid from practices that chase payments.

• Eligibility checked at scheduling. Not the morning of the visit. Problems caught early never become denials.
• Authorizations verified before the study is booked. EEG, EMG, MRI, Botox, and infusions all get checked up front.
• Templates that match payer language. Your documentation should already answer the medical necessity question a reviewer will ask.
• NCCI edits run before submission. Bundling conflicts are cheap to fix before a claim goes out and expensive after.
• Denials reviewed by cause every month. One pile of denials hides the pattern. Sorting by cause shows you what to fix first.
• Clean claim rate tracked as a core number. If you don't know your first-pass rate, you can't improve it.

Why Some Neurology Practices Barely Feel These Changes

Since 1977, ADS has helped specialty practices get paid for the work they do. Our neurology medical billing services and software are built around the codes and payer rules above, and our clients see a nearly 99% first-pass clean claim rate. Run the ONC-certified MedicsCloud EHR with MedicsScribeAI and MedicsPremier practice management in house, or hand the full revenue cycle to ADSRCM and keep the EHR you have.

Want to know where your neurology revenue is leaking? Book a free Revenue Health Review. We'll look at your denials, aging, and authorization workflow and show you what to fix first. Schedule your review, or call 1-800-899-4237 ext 2264 and a real person will answer in under 2 minutes.

Sources

• CMS fact sheet: CY 2027 Medicare Physician Fee Schedule proposed rule
• CMS fact sheet: Interoperability and Prior Authorization Final Rule (CMS-0057-F)
• CMS: ICD-10 code sets
• AMA: 2025 prior authorization physician survey findings
• American Academy of Neurology: 2026 comment letter to CMS on prior authorization
• Experian Health: 2025 State of Claims survey
• Becker's Hospital Review: What's to blame for claim denials?