CCSD code 22025 – EMG and nerve conduction studies for myasthenia gravis

Key takeaways

CCSD code 22025 covers the EMG, nerve conduction and single fiber EMG work done to investigate myasthenia gravis.

The fee pays for the test session and the signed written interpretation, so a record showing only one of them is incomplete.

UK ICD-10 uses G70.0 for myasthenia gravis, and it has no separate code for an exacerbation.

22024 covers the same EMG work without single fiber studies, which is the distinction billers get wrong most often.

Most insurers want the authorization number logged before the test date rather than on the day.

CCSD code 22025 covers a test and a report

CCSD code 22025 pays for the EMG and nerve conduction work used to investigate myasthenia gravis, single fiber EMG included. It applies only where myasthenia gravis is the question being answered.

The Clinical Coding and Schedule Development Group (CCSD) maintains the code as part of the UK private healthcare schedule. Bupa, AXA Health, Aviva, Vitality and other private medical insurers bill against that schedule.

22025 sits in chapter 3 of the schedule, under neurophysiological procedures at section 3.9. It carries a Minor complexity rating, which is what most insurer fee schedules key their rate to. The same neurophysiology section also holds the EEG codes, and CCSD code 22000 covers a routine waking study in a patient over 5.

At the claim stage, scope is the part that decides payment. Two components sit inside the code: the test session itself, and the written clinical interpretation of it. Document one without the other and the claim is incomplete.

Inside a myasthenia gravis EMG session

Knowing what happens in the room makes the documentation easier to get right. A session usually runs three tests in sequence, performed by a consultant neurologist or a clinical neurophysiologist. Each one looks at a different part of neuromuscular function.

• Needle EMG: Records electrical activity in individual muscle fibers at rest and during voluntary contraction. It helps separate a neuromuscular junction disorder from primary muscle disease.
• Nerve conduction studies (NCS): Surface electrode recordings of motor and sensory nerve responses. They establish baseline nerve function and rule out peripheral neuropathy as the cause.
• Single fiber EMG (SFEMG): The specialist component, and the reason this code exists. A fine electrode records action potentials from muscle fibers served by the same motor neuron. The clinician measures neuromuscular jitter, which reflects how reliably the junction transmits. Raised jitter and blocking are hallmarks of myasthenia gravis, and published neurophysiology guidelines put SFEMG sensitivity at roughly 95% in a clinically affected muscle.
• Repetitive nerve stimulation (RNS): Often run in the same session. It tests the junction at a population level using repeated stimuli, then measures the decrement in the compound muscle action potential. RNS is less sensitive than SFEMG, but it depends less on operator technique.

When an insurer accepts the test as necessary

Insurers accept 22025 when the clinical record shows a clear reason to investigate myasthenia gravis. These indications are broadly accepted across the UK private market:

• Suspected or confirmed myasthenia gravis
• Unexplained ptosis with a fatigable component
• Fatigable proximal limb weakness with no other established cause
• Bulbar symptoms such as dysarthria or dysphagia that worsen with repeated activity
• A positive acetylcholine receptor or MuSK antibody result that needs electrophysiological confirmation
• Monitoring of known myasthenia gravis after a treatment change or a relapse

Borderline referrals are where the reviews happen. Fatigue in a patient with non-specific autoimmune disease, for example, will often be queried. For those cases, the referral letter and the notes need to spell out the reasoning rather than imply it.

Recording and reporting are two separate jobs

This is where 22025 claims fall apart under audit, so it is worth being precise about the two halves.

Recording is the physical test session. The clinician, or a supervised technician, performs the needle EMG, the surface NCS and the SFEMG, and captures the waveform data.

Reporting is the written clinical interpretation. The consultant reviews the findings, reads them against the clinical history, and produces a signed report.

Both have to be attributable to the billing consultant. If a technician records the session unsupervised and the consultant writes up the result without being present, many insurers will refuse the claim. Supervision and delegation rules differ by payer, so confirm yours before splitting the work across the team.

• The report is a distinct document, not a note appended to the referral letter
• It carries the consultant’s interpretation, not only the measurement values
• The consultant who signs it is the one the insurer recognizes for this procedure
• Both documents can be produced on request during a claims audit

Use G70.0, not the US five-character codes

Every 22025 claim needs a supporting ICD-10 diagnosis code, and for myasthenia gravis that code is G70.0.

A lot of coding material online is written for the US. There, ICD-10-CM splits myasthenia gravis into G70.00 and G70.01, for cases without and with exacerbation. The UK ICD-10 classification used alongside CCSD has no such subdivision. Submit a five-character code to a UK insurer and it will not match their approved list.

Approved diagnosis lists still vary by payer, so check the insurer’s own list if you bill a code other than G70.0.

G70.0 is also the diagnosis code if the patient later goes to surgery. An open thymectomy is billed under B1800, with G70.0 listed first on the claim.

The neighboring codes that get billed by mistake

The closest call is 22024, which covers the same EMG work when single fiber studies are not part of the session. Choosing between the two comes down to one question: was SFEMG performed?

Numeric proximity is a trap in this part of the schedule. 22021, one digit away from 22022, is anorectal physiology, which belongs to a different specialty. Read the descriptor rather than the number.

If you bill across several investigations, the CCSD codes index is the quicker way to check a neighboring descriptor before you submit. Codes and descriptors are revised periodically, so treat a locally saved copy of the schedule as a draft.

Six steps that get a 22025 claim paid

Every step below maps to a denial reason that shows up on this code, so the sequence doubles as a pre-submission checklist.

1. Confirm cover and file the referral: Check the policy covers 22025 before the appointment is booked. Ask whether a GP or consultant referral letter is a precondition, then save it to the patient record.
2. Get the authorization number: Contact the insurer to find out whether pre-authorization applies to this code. Record the reference against the appointment before the test date, not afterwards.
3. Check the consultant is recognized: Insurers recognize practitioners procedure by procedure. Confirm the billing consultant is on the insurer’s list for 22025 while the appointment is still being booked.
4. Record the full session: Complete the needle EMG, the NCS and the SFEMG. Document the muscles and nerves tested, the waveform values and the jitter measurements.
5. Sign a separate written report: The billing consultant signs a distinct interpretation. It reads the findings against the clinical history and states a conclusion on the myasthenia gravis question.
6. Submit 22025 with G70.0: Most UK private claims go through Healthcode. Put the procedure code and the diagnosis code on the same submission line, and attach or reference the clinical report.

Keeping coverage, authorization and report status on one patient record is the practical route to fewer claim rejections. Spreadsheets tend to hold the authorization number in one place and the report status somewhere else, which is how steps two and five get missed.

Which insurers want authorization first

Prior authorization for 22025 depends on the insurer, the policy and the policy year, so the only reliable answer comes from the payer. The patterns below are a starting point, not a substitute for checking.

Submit without the authorization the policy required and most insurers will not pay retrospectively. A few consider a late request where the clinical situation was urgent, but those are judged case by case. Treat pre-authorization as a booking task rather than a test-day one.

Why 22025 claims get rejected, and how to stop it

Rejections on this code repeat a short list of patterns. Each has a fix that belongs in the workflow rather than in an appeal letter.

Every one of these is an audit question waiting to happen. The record behind the claim matters as much as the claim itself.

What the clinical report has to contain

The report has to stand alone as a record of what was done, what was found and what it means. A reviewer should see both halves of the code satisfied without having to request a second document.

These nine elements are the working minimum:

• Patient demographics and the date of the study
• Clinical indication, covering the referral diagnosis and the reason for investigating
• Muscles and nerves tested, with laterality specified
• EMG findings: spontaneous activity, motor unit morphology and recruitment pattern
• NCS findings: conduction velocities, amplitudes and distal latencies
• SFEMG findings: jitter values, blocking percentage and the muscles sampled
• Clinical interpretation of what the findings mean for the myasthenia gravis question
• Conclusion stating whether the results support or exclude myasthenia gravis
• Signature of the billing consultant, dated

Billing 22025 with other codes on the same day

Co-billing comes down to the insurer’s bundling rules and the codes involved, so three questions cover most of what a practice runs into.

• Can you add a standard EMG code? Not for the same limbs on the same day. 22025 is written to cover the full session for the myasthenia gravis investigation.
• Can you bill a consultation alongside it? Usually yes, where a new patient consultation happened at the same appointment and is documented separately. Same-day consultation rules still differ by insurer.
• What about repetitive nerve stimulation? RNS has no standalone code in the schedules we checked, so plan on it sitting within the session fee. Confirm the position with the payer if your report itemizes it.

Healix and some other payers apply explicit unbundling guidelines to electrophysiology codes. Bundling rules move with each schedule update, so a yearly review of the payers you bill most is worth the hour.

How Pabau keeps a 22025 claim complete

Most of the failure points on this code are administrative, and they are spread across three systems: the diary, the clinical record and the invoice. The authorization number lives in an inbox, the report sits in a shared drive, and the person raising the invoice cannot see either.

Pabau keeps all three on the same patient record. The authorization reference is stored against the appointment. The report template holds required fields, so an unsigned study stays flagged. The diagnosis code is linked in the billing record before the invoice goes out.

Claims then go out through the Healthcode integration with the code, the diagnosis and the reference already attached. For a neurophysiology practice, that means fewer invoices held back for a missing signature, and less time spent reconstructing a study weeks after it happened.

Keep CCSD claims complete before they are submitted

Pabau stores the authorization reference against the appointment, flags a report that has not been signed, and links the diagnosis code in the billing record. Your team submits once and chases less.

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Conclusion

22025 rewards a practice that treats billing as part of the appointment. The fee covers work done in the room and work done later at a desk. Both have to reach the record.

Get three habits in place and the rejections mostly stop. Confirm authorization and recognition while the appointment is being booked. Treat the signed interpretation as part of the procedure rather than paperwork that follows it. Link G70.0, never a US five-character variant.

The trade-off worth remembering is that none of this can be repaired after submission. Book a demo to see how Pabau keeps authorization, documentation and coding on one record for a private neurology practice.

Continue your research

Running the EMG without single fiber studies? CCSD code 22024 is the code that applies when SFEMG is not part of the session.

Billing more of the CCSD schedule than this one code? Bupa CCSD codes explains how the schedule maps onto Bupa’s own code list.

Need the published fee rates? Bupa procedure codes and fee schedule sets out the current rates for Bupa-recognized practitioners.

Frequently asked questions