CPT code 60100 – Thyroid percutaneous core needle biopsy

Key takeaways

CPT code 60100 covers percutaneous core needle biopsy of the thyroid, which yields a histologic tissue core.

Fine needle aspiration (FNA) is billed with 10005 or 10021, so the procedure note must name the needle type and specimen.

Imaging guidance is not included in 60100, and CPT 76942 may be reported separately when real-time ultrasound is documented.

Billing 60100 for an FNA, or the reverse, misstates the service and can create False Claims Act exposure.

Pabau, the practice management platform we build, tracks denials by CPT code and payer, so repeat 60100 errors surface early.

CPT code 60100: Definition and procedure category

CPT code 60100 is a surgical biopsy code for one clinical action. A core needle is advanced through the skin into thyroid tissue to remove a cylindrical sample for histologic analysis. The official AMA descriptor is: Biopsy thyroid, percutaneous core needle.

60100 sits in the Surgery section of the CPT code set, under Endocrine System, in the Excision Procedures on the Thyroid Gland family (60100-60281). Specimen type separates it from adjacent codes. A core needle extracts intact tissue architecture, while fine needle aspiration draws loose cells. That difference decides the code family and the documentation behind it.

• Code family: Excision Procedures on the Thyroid Gland, CPT 60100-60281
• Specimen type: Histologic core (tissue architecture intact)
• Needle type: Core needle (14-18 gauge typical), not a fine needle
• Guidance: Not included in 60100. Ultrasound guidance is billed separately when used and documented.
• Global period: 0 days (minor procedure, no postoperative follow-up included)

The 0-day global period matters for scheduling. A distinct procedure on the same day as 60100 may need modifier -59 to avoid automatic bundling by payers. A significant, separately identifiable E/M visit takes modifier -25 instead.

How percutaneous core needle thyroid biopsy is performed

The procedure note must document each of the following steps to support billing and withstand a payer audit. Generic documentation (“biopsy performed”) is not enough for CPT 60100.

1. Patient positioning and consent: Patient supine, neck extended. Written informed consent documented in the record.
2. Lesion identification: Target thyroid nodule identified clinically or by imaging. Characteristics (size, location, echogenicity) noted in the procedure note.
3. Needle selection: A core biopsy needle (typically 14-18 gauge, automated or semi-automated) is selected. The note must explicitly state “core needle”, not “needle” alone.
4. Guidance (if used): If ultrasound guidance is used, the clinician performing it documents real-time visualization of needle advancement. This documentation is required to bill CPT 76942 separately.
5. Passes and specimen: The number of passes is documented. The specimen sent to pathology is described as a “histologic core” or “tissue core”, which confirms it is not an aspirate.
6. Post-procedure: Hemostasis achieved, pressure applied, patient monitored. Any complications noted.

Each of these elements has a billing consequence. A missing needle-type notation is a frequent audit trigger for 60100 claims. Without it, the payer can’t verify that a core needle was used rather than a fine needle.

CPT 60100 vs CPT 10005: Choosing the right thyroid biopsy code

The most common miscoding error in thyroid biopsy billing is submitting CPT 60100 for a procedure that was an FNA, or the reverse. The two code families are mutually exclusive. The clinical record must support whichever code is billed, and billing the wrong one can create False Claims Act exposure.

The pathology report settles it. If it documents a “tissue core” or “core biopsy specimen”, bill 60100. If it documents “aspirated material”, “cytology smears” or a “cell block”, the procedure was an FNA. Then bill 10005 with ultrasound guidance, or 10021 without imaging guidance. Never infer needle type from imaging guidance alone, as the diagram below shows.

Does CPT 60100 include ultrasound guidance? Coding with CPT 76942

No. CPT 60100 does not include imaging guidance. When ultrasound guides needle placement during a thyroid core biopsy, CPT 76942 may be reported separately, subject to NCCI edit review and payer policy. That code covers ultrasonic guidance for needle placement, with imaging supervision and interpretation, and report.

Before billing 76942 alongside CPT code 60100, run three checks:

• NCCI edit status: Check the current CMS NCCI table for the 60100/76942 pair. If a column 1/column 2 edit exists with a modifier indicator of “1”, modifier -59 (or the matching X modifier) may bypass it. If the indicator is “0”, the codes can’t be billed together with any modifier.
• Documentation: The procedure note must state that real-time ultrasound was used to visualize the needle. “Ultrasound performed before the procedure” does not support 76942, because guidance must be real-time and intra-procedural.
• Who performed the guidance: If the performing clinician and the radiologist are different people, the imaging code’s supervision and interpretation requirements must still be met.

Some payers apply local coverage determination (LCD) restrictions that limit separate billing of 76942 with thyroid biopsy codes. Always check payer policy before filing. When in doubt, use the CMS Physician Fee Schedule lookup tool to confirm the current payment status indicator for 76942 in your setting.

Modifiers for CPT code 60100

Modifier selection errors are a common root cause of CPT code 60100 denials. The table below covers the modifiers most often applied to thyroid biopsy claims.

Medicare does not routinely accept modifier -50 on thyroid biopsy codes. Most MACs prefer bilateral billing as two line items, 60100-LT and 60100-RT. The first unit pays at 100% of the fee schedule and the second at 50%. Verify your MAC’s bilateral billing policy before submitting.

CPT 60100 reimbursement and Medicare fee schedule

The figures below reflect 2026 Medicare Physician Fee Schedule data for CPT code 60100, at the CMS CY2026 conversion factor of $33.40. Rates update every year and vary by geographic practice cost index (GPCI). Check current amounts in the CMS PFS lookup tool or the FastRVU 2026 RVU lookup before billing.

Commercial payer rates vary, so verify them against your contracted fee schedule. Practices billing 60100 through Pabau send claims via the Claim.MD clearinghouse, which supports CMS-1500 and 837P electronic claims to thousands of US payers. Its real-time eligibility check confirms the patient’s plan covers thyroid core biopsy in your setting before the procedure date.

Documentation requirements for billing CPT 60100

Missing documentation is the main audit trigger for CPT code 60100 claims. Every element below belongs in the procedure note or linked records before the claim is filed. Treat it as a pre-submission checklist rather than a post-denial fix.

• Clinical indication: Thyroid nodule characteristics (size in centimeters, location, echogenicity if imaged) and any prior FNA results. Add the medical necessity rationale for core versus fine needle sampling.
• Needle type and gauge: Explicit statement that a core biopsy needle was used, with gauge documented. “14-gauge automated core needle” meets the standard, while “needle biopsy” does not.
• Number of passes: Document each pass and the adequacy of the specimen obtained per pass.
• Imaging guidance (if used): Real-time ultrasound visualization of needle advancement, documented in the procedure note. Include who performed the guidance if different from the operating clinician. Required to support separate billing of CPT 76942.
• Specimen disposition: Explicit statement that the core specimen was submitted to pathology for histologic evaluation. Include the pathology requisition or accession number reference.
• Time and date: Procedure date, start time, and the attending or operating clinician’s signature.

A detailed procedure note paired with a well-structured superbill lets the claim go out clean the first time. A procedure note template can prompt for each field above, so a missing needle gauge is caught before the claim reaches the billing queue.

Prior authorization and medical necessity for CPT 60100

Prior authorization (PA) requirements for CPT code 60100 vary by payer and plan year. Medicare and most Medicaid programs don’t require PA for thyroid core biopsy under standard medical necessity criteria. Many commercial insurers and managed care plans do, so verify with each payer before scheduling.

Common medical necessity criteria payers apply when reviewing PA requests for 60100 include:

• Nodule size threshold: Most payers follow American Thyroid Association (ATA) guidelines. These generally recommend biopsy for nodules 1 cm or larger with suspicious sonographic features, or 1.5 cm or larger for low-suspicion nodules.
• Bethesda classification context: If a prior FNA returned an indeterminate result (Bethesda III or IV), core needle biopsy is often the next step. Payers are more likely to authorize it in that case.
• Imaging documentation: Most payers require an ultrasound report confirming nodule characteristics before approving 60100. Attach the ultrasound report to the PA request.
• Clinician specialty: Some plans restrict 60100 to endocrinologists, head and neck surgeons, or interventional radiologists. Verify network and specialty restrictions.

Use the payer’s prior authorization lookup tool or provider services line to confirm PA requirements before each case. Run insurance eligibility verification at scheduling, not only at check-in. A PA denial found after the claim is filed is far harder to appeal than one caught in advance.

NCCI edits and bundling rules for CPT 60100

The National Correct Coding Initiative (NCCI) governs which codes can be billed with CPT code 60100 and which are bundled into it. Edits update quarterly, so always check the current CMS NCCI table for the exact edit status.

The NCCI Policy Manual notes that procedures in the same anatomical area and the same operative session are generally bundled. Separate reporting needs a clear clinical distinction. Document the clinical reason for any separately billed service in the procedure note.

Common claim denial reasons for CPT 60100 and how to fix them

Most CPT code 60100 denials fall into five categories. Each has a documented root cause and a specific corrective action.

• Wrong code selection (FNA billed as core): This is the most expensive error. Root cause: the coder infers needle type from the clinical setting rather than the procedure note. Fix: require the note to state needle type before 60100 is assigned. If the note is ambiguous, query the clinician before billing.
• Missing ultrasound guidance documentation: The payer denies 76942 billed alongside 60100. Root cause: the note states “ultrasound was available” rather than “real-time ultrasound guidance was used.” Fix: add a dedicated imaging guidance field to the procedure note template, with a checkbox for real-time use.
• NCCI edit violation: Automatic denial when two codes are billed together without the correct modifier. Root cause: the biller applies modifier -59 to a pair with a “0” indicator, which does not allow bypass. Fix: verify each NCCI pair in the current table before filing. Document the clinical rationale when modifier bypass is valid.
• Missing prior authorization: The payer returns the claim with denial code CO-15 (the authorization number is missing, invalid, or does not apply). Fix: add a PA verification step to the scheduling workflow, and capture the authorization number in the patient record before the appointment.
• Global period bundling: The payer bundles a service billed within the global period of a prior 60100 claim. Root cause: with a 0-day global, this usually reflects a billing system misconfiguration. Fix: confirm the global period is set to 0 days in your billing system, and audit for repeat denials on the same patient.

Structured denial management in healthcare tracks denial codes by CPT code, payer and root cause. When 60100 denials cluster on one payer, a policy step is usually missing. Look first at the PA lookup, the modifier rule and the note template. A list of medical billing denial codes helps you map each CARC to its root cause.

How Pabau prevents denials on CPT 60100 claims

Most 60100 denials start before the claim is built. The procedure note leaves out the needle type, eligibility gets checked at check-in, or a modifier rule is missed. A coder then finds the problem after the payer has already rejected the claim.

Pabau connects the procedure note to the claim. Note templates prompt for needle type, gauge, passes and real-time guidance, and built-in CPT and ICD-10 catalogs cut code-entry errors. Claims then go out as 837P files through Claim.MD, with ERA (835) remittances posted back against them.

Pabau’s specialty practice claims software tracks denials by CPT code and payer. When 60100 rejections cluster on one payer, your billing team sees it in the dashboard. They can fix the template or the PA step before the next case.

Bill thyroid core biopsies right the first time

Pabau helps endocrine and surgical practices document procedures, submit claims electronically and track denials by code. Your CPT 60100 claims reach payers with the right supporting detail the first time.

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Conclusion

Start every thyroid biopsy claim with the pathology report. If it says tissue core, bill 60100. If it says aspirate, the FNA codes apply, and no modifier changes that.

The bigger win sits upstream. Build needle type, gauge and real-time guidance into the procedure note template, and move eligibility and PA checks to scheduling. Coders stop querying clinicians, and the denials that remain are the ones that need a judgment call.

The trade-off is a few extra fields for the clinician on each case, which is cheaper than reworking a denied claim. Book a demo to see how Pabau carries a thyroid biopsy from procedure note to paid claim.

Continue your research

Want to understand how the clearinghouse fits into claim submission? Medical claims clearinghouse guide covers how 837P files move from the practice to the payer and where errors are caught.

Looking for guidance on electronic remittance? Electronic remittance advice (ERA) breaks down how 835 files work and how to reconcile payments against submitted claims.

Billing the same procedure for a UK insurer? CCSD code B1230: core biopsy of thyroid gland covers the UK private billing equivalent of CPT 60100.

Imaging the nodule before the biopsy? CPT code 76536 explains how to bill the diagnostic thyroid and head and neck ultrasound.

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