CCSD code 20240 – Impedance audiogram as part of another procedure

Key takeaways

CCSD code 20240 covers an impedance audiogram performed as part of another procedure, so it always sits under a primary procedure code.

Tympanometry and acoustic reflex testing form the core of the test, with Eustachian tube assessment added where it is clinically indicated.

Submitting 20240 with no host code, or mistaking it for standalone code 20230, causes most rejections.

Practice management software like Pabau validates the required fields on a claim before submission and keeps the documentation trail insurers ask for.

CCSD code 20240 never stands alone on an invoice

CCSD code 20240 is the Clinical Coding and Schedule Development code for “impedance audiogram as part of other procedure”. Those last five words carry the whole rule. The code is ancillary, so it describes a test done inside a wider clinical encounter rather than the reason the patient booked.

The CCSD classifies it that way because of how impedance testing usually arises. A patient comes in for an ENT consultation or a hearing assessment. The clinician then adds impedance testing to check middle ear function in the same session.

Ancillary status has one practical consequence. The primary procedure takes its own line on the invoice, and 20240 goes underneath it. Bupa, AXA Health and the other major payers enforce that pairing when they adjudicate. A claim showing only 20240 is rejected automatically, with no host procedure to attach it to.

Three tests hide inside one impedance audiogram

An impedance audiogram measures how the middle ear conducts and reflects sound energy. Nothing is asked of the patient, since the test is objective and needs no behavioral response. It usually runs three components in sequence.

• Tympanometry: A probe tip sits in the ear canal while air pressure is varied to measure eardrum compliance. Results plot as a tympanogram. Type A means normal middle ear function, and Type B suggests fluid or perforation. Type C points to the negative pressure typical of Eustachian tube dysfunction.
• Acoustic reflex testing: A loud stimulus makes the stapedius muscle contract, which stiffens the ossicular chain. The threshold at which the reflex fires tells you about the middle ear and the cochlea. Whether it fires at all says something about the facial nerve pathway.
• Eustachian tube function assessment: Where it is clinically indicated, the tympanometer can also check whether the tube opens properly during swallowing. That matters in recurrent otitis media and at post-grommet follow-up.

British Society of Audiology guidance treats tympanometry and acoustic reflex testing together as the standard core of the test. Equipment must be a calibrated impedance audiometer maintained to BS EN 60645-5. Expect roughly five to ten minutes per ear, depending on how many components you run.

When an impedance audiogram earns its place on the claim

Bill 20240 when middle ear function needs objective evaluation during a broader ENT or audiology encounter. The usual clinical triggers are these.

• Suspected otitis media with effusion, where tympanometry confirms the flat Type B trace and absent acoustic reflexes
• Eustachian tube dysfunction, assessed before grommet insertion and again at post-operative follow-up
• Asymmetric sensorineural hearing loss, where acoustic reflexes help separate a cochlear lesion from a retrocochlear one
• Conductive hearing loss, where the test distinguishes ossicular chain disruption from middle ear effusion
• Facial nerve assessment, using reflex thresholds and decay testing in facial palsy and acoustic neuroma workup
• Hearing aid candidacy, where insurers often want middle ear status confirmed before they authorize assessment codes

An audiologist or an ENT surgeon performs the test, using a calibrated impedance audiometer. In a joint practice, the surgeon often delegates impedance testing to the audiologist sitting alongside them.

Whoever runs it, the primary procedure code has to reflect who is billing, and the note has to attribute the audiogram to the right session.

20230 or 20240? One question settles it

Mixing up 20240 and 20230 is the most common coding error in impedance audiometry billing. Both codes describe the same physical test.

What separates them is context, because 20230 is the standalone code and 20240 is the ancillary one. Pick the wrong one and the claim is invalid, not merely untidy. The same trap runs through the schedule, where B2752 pays for a subcutaneous mastectomy only if no implant goes in during that operation.

Glaucoma surgery splits the same way, where CCSD code C6012 applies only when canaloplasty and cataract surgery happen at one sitting. Canaloplasty on its own bills as C6011.

So there is a single decision rule. If the impedance test is the only thing on the schedule for that appointment, use 20230. If anything else is billed for the same date of service, the audiogram is 20240.

Capturing the appointment purpose at the point of booking lets billing staff apply that rule without reading back through the clinical notes.

The audiology codes that sit either side of 20240

Audiology billing runs on a small cluster of CCSD codes that practitioners use alongside 20240 or instead of it. Knowing the neighbours cuts miscoding and makes insurer queries quicker to answer.

Treat those descriptors as a guide rather than gospel. Wording shifts between schedule releases, and individual payers apply their own fee adjustments on top.

Five steps from appointment to paid claim

A clean 20240 invoice rests on four elements. You need the primary code, the ancillary line beneath it, a description that explains the test, and notes you can retrieve on request.

Five steps get all four into place:

1. Identify the primary procedure code. The usual hosts are a pure tone audiogram (20200) or an outpatient consultation code. A surgical code works too, where impedance testing happened on the same date. The host must reflect the main clinical activity. Never pick a code simply to give 20240 somewhere to sit.
2. Add 20240 as a separate line item. On Healthcode and insurer submission forms, each procedure gets its own line with its CCSD code, a quantity of one, and the fee. Fees for 20240 and 20230 are set separately, so check the payer portal before you invoice.
3. State the clinical reason in the description field. Most practices leave the bare descriptor there. Write something closer to “tympanometry and acoustic reflex testing, bilateral, otitis media with effusion workup” instead. Bupa runs automated pre-payment audits on ancillary codes, and the extra detail heads off queries.
4. Confirm pre-authorization for both codes. Where impedance testing is likely, request authorization for the host code and 20240 together at the outset. Adding 20240 later to an episode authorized only for the consultation is a common rejection. Some insurers accept retrospective requests, and others simply do not pay.
5. Submit through Healthcode or the insurer’s portal. Healthcode is the standard electronic pathway for most major UK insurers. Paper invoices skip automated validation, so they take longer and surface errors later.

What your notes must show if Bupa audits you

Insurers expect the record to support both the primary procedure and the impedance test. A claim can be paid first and clawed back later if the notes fall short on audit. Run through this checklist before the invoice goes out.

• Date of service: The audiogram must be recorded on the same date as the primary procedure. Billing 20240 against a different date is a coding violation and will be rejected.
• Indication for the test: A short justification does the job. “Bilateral hearing loss with flat tympanogram on screening” or “post-grommet follow-up, assessing Eustachian tube function” both demonstrate medical necessity.
• Equipment used: Note the make and model of the impedance audiometer, plus its last calibration date. Bupa and AXA Health may ask for this on audit.
• Results: Record the tympanogram type for each ear, the acoustic reflex thresholds or their absence, and any Eustachian tube findings. “Impedance audiometry performed” on its own does not satisfy anyone.
• Clinician identity: Name whoever performed the test. Where an audiologist works inside an ENT surgeon’s practice, both names belong in the relevant parts of the note.

Structured patient records with pre-built audiology templates make that standard far easier to hold across a team. Paper notes drift as soon as a busy clinician starts abbreviating.

Every insurer reads ancillary codes a little differently

The major UK private medical insurers all handle ancillary audiology codes in their own way. The table below sets out what each one wants for 20240. Fees are deliberately left out, since they are revised annually and only the current schedule is safe to quote.

Bundling is where the genuine disagreement sits. Insurers argue that a quick impedance test belongs to the consultation. Practices point to the specialist equipment and the extra chair time it takes. The schedule bundles access steps elsewhere too, since CCSD code A5580 already covers the lumbar puncture used to deliver the infusion.

Your clinical record is the lever in that argument. A note listing the components performed and their findings is much harder to fold into a consultation fee than a one-line entry. One documentation standard applied to every ancillary code you bill, not just this one, is what keeps the pushback down.

Worth knowing too: Bupa CCSD codes are published with a complexity band and a benefit maximum where one applies. 20240 shows neither. Its fee is confirmed against the member policy rather than read off a table.

Codes that only ever sit beside another show up outside audiology too. AA588 covers a coronary angioplasty standby team, and it goes on the same authorization request as the angioplasty code. Eye surgery follows the pattern, since CCSD code C5910 lists its co-procedure codes on one authorization request and invoices each on its own line.

Where 20240 claims fall over, step by step

Rejection patterns for 20240 barely vary between practices or payers. Almost all of them are preventable at invoice creation rather than through an appeal. Mapped onto the claim’s path, the failure points look like this.

• No primary procedure code on the invoice. Far and away the most common rejection. A lone 20240 reads as a standalone claim, which contradicts its classification. A pre-submission check for any 20240 line without a host code on the same date fixes it.
• The wrong code of the pair. A clinician runs impedance testing during a consultation, and admin codes it 20230. The insurer can then reject that 20230, because a consultation was billed the same day. Use the comparison table above to choose.
• Pre-authorization missing for the ancillary code. Some Bupa and AXA Health policies authorize line by line rather than per episode. Adding 20240 to an invoice authorized only for the consultation triggers a “not authorised” rejection.
• Documentation too thin on audit. Bupa audits ancillary codes retrospectively. Notes with no results, no equipment detail and no indication can lose you the fee months after it was paid.
• The member policy bundles it. Some policies treat standard audiological tests during a consultation as included. That is a policy decision rather than a coding error. Read the member’s schedule, then challenge the decision with the equipment and the chair time involved.
• Dates that do not match. If the primary procedure and 20240 reach the insurer on different dates, adjudication cannot link them. Both belong on one submission, sharing one date of service.

How Pabau keeps CCSD 20240 claims audit-ready

Every rejection above starts in the same place: a spreadsheet or a paper ledger, where no one checks the invoice before it goes out. Practice management software like Pabau moves that validation into the workflow, so problems surface while the claim can still be fixed.

Pabau’s claims management software gives audiology and ENT teams a stored CCSD code library to invoice from. Invoice lines also pre-fill from what is already on the patient record. Staff pick 20240 from the library rather than retyping it, and the required claim fields are checked for completeness before submission.

The audit trail sits in the same place as the notes. When an insurer asks for support on a 20240 claim, you export the record instead of rebuilding it from paper. For a multi-clinician ENT practice, that turns a two-hour job into a fifteen-minute one.

Keep every CCSD 20240 claim submission-ready

Pabau helps audiology and ENT practices store their CCSD code library and check that every required claim field is complete. The documentation trail private insurers ask for on audit stays in one place.

Book a demo

Conclusion

CCSD code 20240 is simple once the pairing rule sticks. Bill it whenever an impedance audiogram runs as part of another procedure, always beneath the host code, never on its own.

The errors cluster in three places. Practices lose the fee by reaching for 20230 when a consultation was also billed. Others forget to pre-authorize the ancillary line, or write notes that record no results. None of those is a knowledge problem, so the answer is a workflow that catches them before submission rather than a coder who remembers harder.

Get that right and the money arrives on the first submission, with nothing clawed back at audit. Book a demo to see how Pabau handles CCSD billing and audit records for audiology and ENT practices.

Continue your research

Looking for a full Bupa CCSD code reference? Bupa CCSD codes guide covers the most commonly billed codes across all Bupa-recognized specialties, with guidance on navigating the fee schedule.

Need to understand Bupa’s procedure fee structure? Bupa procedure codes and fee schedule explains how fees are set, updated and verified for UK private practice billing.

Wondering why claims keep coming back? Denial codes in medical billing decodes the rejection reasons payers return, and what to change before you resubmit.

Comparing systems to run private billing on? Best medical billing software in the UK weighs the platforms UK practices use for insurer submissions and reconciliation.

Frequently asked questions