CCSD code A6810 – Peripheral nerve neurolysis and transposition

Key takeaways

CCSD code A6810 requires both acts named in its descriptor: the nerve is released, and then it is transposed.

Release without transposition is billed under A6700, A6600 or A6710, never under A6810.

Carpal tunnel release is excluded from A6810 and carries its own dedicated CCSD code.

Cubital tunnel syndrome at the elbow is the most common indication, paired with ICD-10 code G56.2.

Pre-authorisation and an operative note naming the specific nerve are both required before the claim is submitted.

CCSD Code A6810: official definition and chapter placement

The CCSD schedule, maintained by the Clinical Coding and Schedule Development Group, officially describes CCSD Code A6810 as “neurolysis and transposition of peripheral nerve (excludes carpal tunnel release)”. The code belongs to Chapter 3 of the CCSD schedule, which covers the spine, spinal cord, and peripheral nerves. Two independent payer chapter guides – AXA Health and Freedom Health Insurance – confirm this Chapter 3 placement.

The descriptor names two acts, and A6810 requires both of them. Neurolysis is the release of a peripheral nerve from compressive scar tissue, fibrous bands, or adjacent structures. Transposition is the re-routing of that same nerve into a new position, which may be subcutaneous, intramuscular, or submuscular.

A6810 applies when the surgeon frees the nerve and then moves it, on any peripheral nerve except the median nerve at the wrist. Release on its own does not qualify. An isolated decompression that leaves the nerve in its original bed is billed under A6700, A6600 or A6710, depending on the nerve and the site.

Neurolysis vs transposition: what each procedure involves

Neurolysis and transposition are two parts of the same operation when A6810 applies. Neurolysis frees the nerve from whatever is compressing it. Transposition then moves the nerve into a new position, so the compression cannot return. The table below sets out the three transposition variants a surgeon may record.

Neurolysis carried out on its own belongs to a different code. Where the surgeon releases the nerve and leaves it in its original bed, the claim goes under A6700, A6600 or A6710. The nerve and the site decide which of the three applies. A6810 is reserved for the operation that does both.

The operative note must specify which procedure type the surgeon performed. “Ulnar nerve decompression” on its own is not sufficient. The note must state whether the surgeon transposed the nerve, and which variant they used. Insurers read that detail to confirm A6810 rather than a less complex alternative.

The chart below maps each operative finding in this part of Chapter 3 to the code it belongs under.

Common clinical indications for CCSD Code A6810

Practices most frequently bill A6810 for ulnar nerve procedures at the elbow. It covers peripheral nerve entrapment across the upper and lower limbs alike. The diagnosis code submitted with the claim must match one of the accepted ICD-10 categories for medical necessity. Verify specific ICD-10 codes against the current NHS Classifications Browser before submitting; the codes below reflect standard clinical mapping.

• Cubital tunnel syndrome (ulnar nerve entrapment at elbow) – ICD-10 G56.2 (lesion of ulnar nerve). The most common indication for anterior transposition under A6810. It applies particularly where splinting and physiotherapy have not resolved symptoms after three to six months.
• Tardy ulnar palsy – Delayed-onset ulnar nerve dysfunction following old elbow trauma. Maps to G56.2 with supporting clinical history in the operative note.
• Other upper limb peripheral nerve entrapment – Radial nerve compression (G56.3), or entrapment at sites other than the wrist. Confirm the nerve and anatomical site in the operative note.
• Lower limb peripheral nerve entrapment – Common peroneal nerve compression (G57.3), or another G57-series mononeuropathy where the nerve is released and then re-routed. A6810 applies to lower limb peripheral nerves as well as upper limb.
• Post-traumatic nerve adhesion – Nerve bound by scar tissue following fracture, crush injury, or prior surgery. Document the original injury, the interval since injury, and the current neurological deficit.

A6810 is not appropriate for tarsal tunnel syndrome at the ankle, or for procedures on the median nerve at the wrist. Both have their own CCSD codes. Matching the ICD-10 diagnosis to the named nerve in the operative note is the most effective way to prevent a medical necessity denial.

What CCSD Code A6810 excludes: the carpal tunnel boundary

The code’s own descriptor explicitly excludes carpal tunnel release from CCSD Code A6810. The median nerve at the wrist has a dedicated CCSD code, so verify the exact code number in the current CCSD schedule. The schedule is a licensed document, and code numbers for adjacent procedures can be updated. Using A6810 for a carpal tunnel release is a coding error rather than a grey area. As a result, insurers who identify it on audit may seek recovery of the fee.

The anatomical boundary is clear in practice. The median nerve travels through the carpal tunnel at the wrist, and surgeons release it by dividing the flexor retinaculum. That operation falls outside A6810, whether the approach is open or endoscopic. Every other peripheral nerve may fall within A6810, depending on the procedure performed. That includes the ulnar nerve at the elbow, the radial nerve, the common peroneal nerve and the sural nerve.

Neighbouring CCSD codes and how to differentiate them

Chapter 3 of the CCSD schedule contains several codes that describe related peripheral nerve procedures. Selecting the wrong adjacent code is the second most common coding error on peripheral nerve claims, after the carpal tunnel exclusion. The reference table below covers the codes most frequently confused with A6810. Fee values are not published here, because the schedule is licensed and fees change. Check your contracted payer schedule, or the wider CCSD codes reference, for current rates.

Verify every adjacent code against the current licensed CCSD schedule before you submit, because the schedule is revised and codes move. The BUPA CCSD codes reference shows how one major payer applies the same schedule in practice.

Documentation requirements for a valid A6810 claim

Inadequate operative note specificity is the leading cause of A6810 claim denial. Insurers will almost always query or reject an operative note that says “ulnar nerve surgery at elbow”. The note must be granular enough that a medical reviewer can confirm A6810 is the correct code without calling the surgeon.

Every A6810 claim has to be supported by an operative note carrying all of the following elements.

1. Named nerve(s) operated on – state the nerve by name and anatomical location (e.g. “ulnar nerve at the medial epicondyle”).
2. Procedure type – specify neurolysis, anterior subcutaneous transposition, submuscular transposition, or intramuscular transposition. “Decompression” alone is insufficient.
3. Operative approach – open or endoscopic; incision site and length; whether the medial epicondyle was osteotomised if a submuscular technique was used.
4. Pre-authorisation number – the insurer-issued number obtained before surgery. Insurers reject claims submitted without it at the administrative stage, before clinical review even begins.
5. Surgeon and anaesthetist details – consultant name, GMC number, and anaesthetist details where a separate anaesthesia claim will be submitted.
6. Intraoperative nerve monitoring (if performed) – document whether electrophysiological monitoring was used, who performed it, and the findings. This supports a separate monitoring claim where payer policy permits it; see the note on companion codes below.
7. ICD-10 diagnosis code – the primary diagnosis code that supports medical necessity (e.g. G56.2 for cubital tunnel syndrome), consistent with the pre-authorisation request.

Consultants arriving from the NHS often underestimate how much more detailed PMI operative documentation has to be. NHS coding teams complete the coding from the record afterwards. By contrast, a private insurer expects the note itself to validate the code.

Pre-authorisation: what payers require before approving A6810

All major UK private medical insurers treat peripheral nerve neurolysis and transposition as elective surgical procedures requiring pre-authorisation before the operation takes place. Insurers rarely grant authorisation sought after surgery, and they deny the claim as a result. Verify current pre-auth requirements directly with each payer before booking; rules change and the guidance below reflects general practice rather than a specific policy cycle.

The pre-authorisation pack for a cubital tunnel case usually has three parts.

• Nerve conduction study results confirming ulnar nerve slowing across the elbow.
• Three to six months of documented conservative management, such as splinting and activity modification.
• A consultant referral letter naming the proposed CCSD code.

All three need to reach the insurer before you book the operation.

Common reasons A6810 claims are denied

Insurers deny A6810 claims more often than most surgical procedure claims. The code sits on an exclusion boundary at the carpal tunnel. It also demands more specific operative documentation than a straightforward excision or repair code. These are the six denial patterns encountered most frequently in UK private practice billing.

1. Code used for carpal tunnel release. A direct exclusion violation. Fix: bill carpal tunnel release under the correct dedicated CCSD code. If already submitted, notify the insurer, withdraw the A6810 claim, and resubmit under the correct code.
2. Operative note does not name the specific nerve. A reviewer who cannot identify the nerve from the note cannot confirm the code is correct. Fix: rebuild the operative note template so the nerve name and anatomical site are mandatory fields before the note is signed off.
3. No pre-authorisation number on the claim. Administrative denial before clinical review. Fix: enter the pre-auth number on the claim form at submission. Practice management software with a dedicated pre-auth field, such as Pabau’s claims management software, does this automatically.
4. Wrong companion code submitted. An anaesthesia code that does not match the surgical procedure category, or a monitoring code that the payer does not permit alongside A6810. Fix: confirm companion code combinations with the payer before submission.
5. Procedure billed under an incorrect neighbouring code. A6810 selected where A6400 (nerve repair) or A6110 (neuroma excision) was accurate, or where the nerve was released but never transposed. Fix: review the operative note against the Chapter 3 code table before billing.
6. Diagnosis code does not support medical necessity. A code too non-specific may trigger a medical necessity query, such as a general peripheral nerve disorder code where G56.2 was available. Fix: use the most specific ICD-10 code supported by the clinical notes and nerve conduction results.

Companion codes: anaesthesia and add-on procedures

Most A6810 procedures are performed under general or regional anaesthesia, generating a separate anaesthesia claim. How that claim is structured depends on which payer the patient is insured with and whether the anaesthetist holds their own recognition with that insurer.

Three companion-code scenarios arise regularly on A6810 cases. Each requires a separate conversation with the payer before submission.

• Anaesthesia code pairing. The anaesthesia CCSD code appropriate for a peripheral nerve procedure at the elbow is not universal across payer schedules. Some payers use a time-based anaesthesia unit system; others apply a fixed surgical anaesthesia code. The anaesthetist’s own billing team usually handles this. The surgeon’s practice should still confirm the pairing before submission, because a mismatch between the anaesthesia and surgical codes is denied.
• Intraoperative neurophysiology (nerve monitoring). Whether electrophysiological monitoring during an A6810 procedure can be separately billed depends entirely on the payer. BUPA, AXA Health and Aviva each set their own policy on nerve monitoring. It is either bundled within the surgical fee or reimbursed separately. Always verify with the payer before advising patients that monitoring will be separately charged.
• Bilateral or multiple nerve procedures in a single session. CCSD billing rules for bilateral peripheral nerve procedures and for multiple nerve operations in the same operative session vary by payer. Some apply a full fee for the primary nerve and a percentage reduction for each additional nerve; others require a separate pre-authorisation for each nerve. Do not assume a bilateral modifier adds automatically; contact the payer’s provider line before the operation to confirm the billing structure.

How to bill CCSD Code A6810 correctly in your practice management system

A complete A6810 billing workflow has six steps, and following them in order prevents most of the denial causes above. Practice management software like Pabau carries a built-in CCSD code set, so staff pick the code from a validated list rather than type it by hand.

1. Confirm pre-authorisation before surgery. Obtain the authorisation number from the insurer, then record the date and the reference against the patient’s episode. In Pabau, that number carries through to the claim automatically.
2. Select A6810 from the CCSD schedule. In a system with a built-in CCSD code set, search for “A6810” or “neurolysis transposition” rather than typing the code manually.
3. Attach the correct ICD-10 diagnosis code. G56.2 for cubital tunnel syndrome (ulnar nerve lesion), or the appropriate G57-series code for lower limb peripheral nerve entrapment. The diagnosis must match the pre-auth request.
4. Reference the operative note. The billing record should carry the operative note date and its document identifier. Stored documentation shortens your response to insurer queries or audits.
5. Add companion anaesthesia code. Confirm the correct anaesthesia code with the anaesthetist’s team and enter it on the claim where the anaesthetist is billing through the same practice. If billing separately, share the A6810 claim reference so the insurer can match both claims.
6. Submit with the authorisation number. The pre-auth number belongs in the designated field on the insurer’s claim form. Claims without it are administratively rejected before clinical review, so make that field mandatory at submission.

Pabau holds the CCSD code set, the authorisation number, the diagnosis code and the operative note reference against the same patient record. Your billing team builds the claim from what the surgeon already recorded, instead of chasing scattered records. Peripheral nerve claims leave the practice sooner and come back queried less often.

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Pabau’s built-in CCSD code set, pre-authorisation tracking, and digital operative note linking help UK private practices submit peripheral nerve claims correctly the first time.

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Conclusion

CCSD code A6810 is straightforward to select once three conditions are met: the operative note names the nerve and says what was done to it, the pre-authorisation is in place before the operation, and the coder understands and respects the carpal tunnel exclusion.

Denials on peripheral nerve claims almost always trace back to one of those three conditions. A vague note, a missing authorisation number, or a carpal tunnel release billed here instead of under its own code will each stop the claim.

Keep the code, the diagnosis and the authorisation number on one patient record, from booking through to submission. Your billing team then stops rebuilding each claim from scratch. Book a demo to see how Pabau handles UK private practice billing end to end.

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