Neurology billing

Counting nerve conduction studies and EMG

Under Palmetto GBA’s billing article, each nerve, or named branch, counts once however many sites or methods are tested on it, and motor and sensory studies count separately. Median motor and sensory on both hands plus ulnar motor and sensory on one is six studies, billed once as 95909. A complete needle exam of that arm adds one unit of 95886.

First Coast’s article denies studies past the maximum in CPT Appendix J, wants nerve conduction and needle EMG done the same day on the same claim, and for repeat testing accepts two tests per diagnosis in 12 months for conditions such as carpal tunnel and radiculopathy (three for motor neuron disease and plexopathy). Other contractors set their own limits, so we follow yours.

Botulinum toxin claims: units, waste and JW or JZ

Each toxin has its own code and billing unit: onabotulinumtoxinA (J0585), incobotulinumtoxinA (J0588) and daxibotulinumtoxinA (J0589) are billed per unit, abobotulinumtoxinA (J0586) per 5 units and rimabotulinumtoxinB (J0587) per 100. So 500 units of abobotulinumtoxinA is 100 billing units. Novitas’s botulinum toxin article rejects the claim if the injection code (such as 64612 or 64615) and the toxin code are not on the same claim, and can deny the injection along with a denied drug.

For a single-dose vial, the dose goes on one line and the discarded amount on a second line with JW, or the line carries JZ when nothing was wasted. A 200-unit vial that gives a 150-unit dose is billed as 150 units, plus 50 units with JW. Since October 1, 2023, claims without the right modifier can be returned, according to CMS’s JW and JZ FAQ. The note names the toxin, the dose in each muscle and the amount wasted, and for chronic migraine, migraines on 15 or more days a month.

E/M visits, G2211 and prior authorization

An E/M on the same day as an NCS, EMG or EEG takes modifier 25 only when it goes beyond the test’s own pre- and post-test work, and interpreting the test is never part of it, under the 2026 NCCI policy manual.

G2211 adds payment to an office visit when you give ongoing care for a single serious or complex condition. CMS’s G2211 guidance denies it when the visit carries modifier 25, so a visit billed with a same-day injection or nerve study loses it, unless the modifier 25 is for a preventive service, vaccine or annual wellness visit.

From 2026, Medicare Advantage, Medicaid and CHIP plans must decide standard prior authorization requests within 7 calendar days and urgent ones within 72 hours, with a specific reason for any denial, under CMS-0057-F. The rule does not cover drugs, so toxin and infusion approvals still run on each plan’s own clock. Our prior authorization team requests imaging, sleep studies and drugs before the visit.

Why neurology claims deny

Common neurology denials, with the reason codes that often carry them (codes vary by payer):

• More nerve studies than allowed that day, or a repeat test too soon (CO-151)
• A diagnosis the payer does not cover for the test or drug (CO-50 or CO-167)
• An EMG add-on (95885 to 95887) without the nerve conduction code on the claim (CO-107)
• An E/M with no separate service beyond a same-day test or injection (CO-97)
• A toxin line without JW or JZ, returned as incomplete (CO-16)
• No approval on file for the imaging, sleep study or drug (CO-197)

Each one goes through our denial management process, corrected and resubmitted or appealed with the report, and our denial code guides explain what each code means.

Credentialing for neurologists

Medicare screens physicians and medical groups at its limited-risk level. A sleep or neurodiagnostic lab that enrolls on its own as an independent diagnostic testing facility (IDTF) is screened at the moderate level, which adds an on-site visit. Our provider credentialing service handles both at $189 per payer application, less in bulk.