CPT code 70490 – CT soft tissue neck without contrast

Key takeaways

CPT Code 70490 is only for CT of the soft tissue neck without contrast. If the radiology report shows contrast was given, expect the claim to be denied.

The 70490/70491/70492 triad maps to without, with, and with-and-without contrast. Never bill 70490 and 70491 together for the same neck study on the same date.

Modifier 26 (professional component) and modifier TC (technical component) split global billing when the facility and radiologist bill separately.

Pabau, the practice management platform we build, validates claims before submission and tracks their status through its Claim.MD clearinghouse integration.

CPT Code 70490: Official descriptor and clinical scope

CPT Code 70490 covers CT imaging of the cervical soft tissues from the base of the skull to the thoracic inlet. It carries the official AMA CPT descriptor: “Computed tomography, soft tissue neck; without contrast material.” The radiologist gives no intravenous contrast at any point during the study.

Without-contrast imaging suits evaluation of calcified structures, dense foreign bodies, and suspected thyroid or salivary gland calcification. It also provides a baseline before a contrast study. Radiologists also order 70490 when a patient has a documented contrast allergy or renal impairment that precludes contrast administration.

The code family covers only the soft tissue of the neck, not the osseous cervical spine. Cervical spine CT, however, falls under a separate code range. Correct anatomical identification in the ordering physician’s note is the first documentation requirement payers review on audit.

CPT 70490 vs 70491 vs 70492: Choosing the right contrast-level code

The three neck CT codes map directly to contrast level. In practice, billing the wrong one is a frequent cause of neck CT denials. National Correct Coding Initiative (NCCI) edits also prevent billing 70490 and 70491 together. This applies to the same anatomical region on the same date of service.

If the radiologist acquires both a non-contrast and a post-contrast series in one session, the correct code is 70492. Billing both 70490 and 70491 on the same date triggers an NCCI column 1/column 2 edit. The edit denies the lesser-valued code outright.

Modifiers for CPT Code 70490: Professional component, technical component, and others

Modifier selection for CPT 70490 depends on the billing setting. Four scenarios arise in practice:

• Global billing (no modifier): The facility owns the equipment and employs the radiologist, billing both components together. The claim carries no modifier. Most hospital-based radiology departments bill globally.
• Modifier 26 (professional component): The radiologist bills only for the interpretation and report. The facility bills separately for the equipment, supplies, and technical staff. Modifier 26 goes on the radiologist’s claim.
• Modifier TC (technical component): The facility bills for equipment and technical personnel only. It goes on the facility’s claim when the radiologist bills separately under modifier 26.
• Modifier 59 (distinct procedural service): It covers a neck CT done on the same date as a CT of another anatomical region. Documentation must support medical necessity for both. Without it, payers may bundle the second study.

Independent imaging centers billing in a non-facility setting typically bill the global code without a modifier. Verify the payer’s specific modifier policy before submission. Some Medicaid managed care plans require modifier 26 even when the practice owns the equipment.

Medicare reimbursement rate for CPT 70490

Medicare reimburses CPT 70490 under the CMS Physician Fee Schedule. Rates vary by geographic locality through the Geographic Practice Cost Index (GPCI). The figures below are 2026 CMS national amounts at the non-QPP conversion factor of $33.4009, before GPCI adjustment. Always confirm the rate for your Medicare Administrative Contractor (MAC) jurisdiction in the CMS look-up tool. The GPCI moves each local rate above or below the national figure.

When the radiologist and the facility bill separately, the global payment splits into a professional share and a technical share.

The table adds the work RVU behind each amount and shows what changes in a facility setting.

RVU data changes each January 1, and Congress can adjust it mid-year. Use the FastRVU look-up tool to confirm current work, practice expense, and malpractice RVUs for your locality. Do this before contract negotiations or fee schedule analysis.

Prior authorization requirements for CPT Code 70490

Prior authorization for CPT Code 70490 varies by payer. Medicare’s Appropriate Use Criteria (AUC) program for advanced diagnostic imaging is currently not in effect. CMS paused the program and rescinded its regulations in the CY 2024 Physician Fee Schedule final rule.

Commercial payers apply their own prior authorization rules, which change more frequently than Medicare policy. Patterns across major payers include:

• UnitedHealthcare: It requires prior authorization for most outpatient CT studies through its Radiology Benefit Manager (RBM). Submit clinical notes, ordering physician documentation, and the ICD-10 diagnosis code supporting medical necessity.
• Aetna: Uses an AUC-aligned clinical review process. Aetna generally requires authorization unless the order comes from an emergency or inpatient setting.
• Cigna: Routes CT authorization requests through eviCore. Clinical documentation must show that the soft tissue neck is the anatomical target and state the clinical indication. It must also explain why without-contrast imaging is appropriate for this patient.
• Medicaid managed care: Rules vary by state. Some plans require authorization for all advanced imaging; others exempt emergent studies or studies ordered by a treating specialist.

Documentation that consistently supports approval starts with the ordering physician’s clinical note stating the specific indication. Add prior relevant studies and relevant labs, such as creatinine if the team considered and rejected contrast. Include the radiologist’s preliminary assessment of the imaging plan too.

Common ICD-10-CM codes paired with CPT Code 70490

The diagnosis code must support the clinical rationale for imaging the soft tissue neck specifically without contrast. Payers cross-check the diagnosis against the CPT code when they adjudicate medical necessity. Confirm the most specific code the documentation supports in the ICD-10-CM code set.

When the clinical indication calls for both pre- and post-contrast imaging, document the rationale for 70492 in the ordering note. Do not submit 70490 and assume the payer will accept it as a standalone study.

Why CPT 70490 claims get denied and how to fix them

Radiology billers see a predictable set of denial patterns for CPT 70490. Each one maps to a claim adjustment reason code (CARC). As a result, the code on the remittance tells you which fix to make.

• Wrong contrast-level code billed (CARC 4 / CARC 97): The most frequent error. If the scan acquired post-contrast images, 70490 is wrong. Pull the radiology report and verify the contrast administration note before submission.
• Missing or insufficient medical necessity documentation (CARC 50): The ordering physician’s note must state the clinical indication and explain why CT is necessary. A note reading “neck mass, CT ordered” may not satisfy payer requirements. Link the ICD-10 to a clinical finding, not just a symptom code.
• Prior authorization not obtained (CARC 15): The authorization number is missing, or it arrived after the date of service. Route every CT request through your prior authorization queue before scheduling.
• Modifier missing or incorrect (CARC 4): In a split-billing arrangement, payers will deny the radiologist’s claim without modifier 26 or bundle it with the facility claim. Confirm the billing setting before submission.
• Bundling with same-date head CT (NCCI edit): If you bill a head CT (70450-70470 range) the same date, payers may bundle the neck study. Modifier 59 overrides the edit only when documentation shows both studies are distinct and separately medically necessary.
• Timely filing exceeded (CARC 29): Most commercial payers require submission within 90-180 days of service. Medicare’s timely filing limit is one year from the date of service.

After a medical necessity denial, resubmit with an appeal (or reconsideration request) and attach an Explanation of Medical Necessity (EOMN) letter. The letter cites the specific clinical findings that support the imaging order. Track electronic remittance advice (ERA) through your clearinghouse, so CARC codes surface as soon as the ERA posts. Waiting for the paper explanation of benefits (EOB) costs days.

Bundling and unbundling rules for neck CT codes

NCCI edits define which code pairs a provider cannot bill together for the same patient on the same date of service. Only an appropriate modifier overrides the edit.

NCCI treats the 70490-70491 pair as a column 1/column 2 relationship. The two codes are contrast-level variations of the same procedure on the same anatomical site. In fact, billing both is an unbundling attempt. The correct code depends on which series the radiologist acquired, and when:

• Non-contrast series acquired, then contrast administered during same visit: Bill 70492 only. This code already includes both the without-contrast and with-contrast acquisitions in a single study.
• Separate non-contrast study legitimately ordered on a different date: 70490 is appropriate for the non-contrast visit. Use 70491 or 70492 for the contrast visit. Dates of service must differ.
• Non-contrast and contrast studies ordered for genuinely distinct clinical questions: Modifier 59 may apply. However, the medical records must document two separate clinical indications. Payers scrutinize this pattern, so documentation must be airtight.

CMS updates NCCI edits quarterly. Review the CMS NCCI Policy Manual at the start of each quarter. This confirms that the edits applicable to your CPT pairs have not changed. Our denial management guide walks through a full workflow for handling NCCI-triggered rejections.

Related neck and head CT CPT codes

Coders working in radiology billing need to navigate the full head and neck CT block. The table below maps the codes around CPT Code 70490. Use it to select the correct code when the study involves adjacent anatomy or a different modality.

Radiology billing workflow: Submitting clean CPT 70490 claims

A structured pre-submission checklist catches most avoidable CPT Code 70490 denials before the claim reaches the clearinghouse. Run these five checks, in order, on every neck CT claim.

• Step 1 — Verify the radiology report: Confirm the report documents soft tissue neck as the anatomical target. It must state explicitly whether the scan used IV contrast. This sets the correct code from 70490, 70491, or 70492.
• Step 2 — Confirm prior authorization: Match the authorization number to the CPT code authorized. An auth for 70491 does not cover 70490.
• Step 3 — Pair the correct ICD-10: Select the most specific ICD-10-CM code that links the clinical finding to the imaging order. Avoid symptom-only codes when the record documents a confirmed diagnosis.
• Step 4 — Apply the correct modifier: Determine whether the claim is global, professional component only, or technical component only. Then append the appropriate modifier, or none for a global claim.
• Step 5 — Scrub the claim before transmission: Run the claim through an electronic claims scrubber or claims management software before it reaches the clearinghouse. The check catches NCCI edits, modifier conflicts, and missing required fields.

Electronic remittance advice through a medical claims clearinghouse posts CARC and remittance advice remark codes (RARC) automatically. Your team can then triage and resubmit without matching paper EOBs to claim lines by hand.

How claims management software reduces CPT 70490 denials

Without a claims system, billers check contrast level, modifiers, and authorization numbers by hand. Then they chase claim status on payer portals. A missed field only shows up weeks later as a CARC on the remittance.

Pabau pulls the patient, insurer, and treatment details from the patient record into a pre-filled claim. Validation checks run in the background for required details such as membership numbers and authorization codes. Claims go out through the Claim.MD clearinghouse integration, which also runs real-time eligibility checks.

Every claim then sits in one view by status, from pending to paid or error. Electronic remittance advice posts against the right invoice. As a result, a CARC 4 on a 70490 claim surfaces as soon as it arrives. Your team corrects and resubmits while the radiology report is still fresh.

Stop losing revenue to radiology billing errors

Pabau validates radiology claims before submission and posts ERA remittances through the Claim.MD clearinghouse. Your team sees denial codes early and resubmits faster.

Book a demo

Conclusion

Treat the radiology report as the deciding document for every 70490 claim. If it doesn’t state plainly that the scan used no contrast, query the radiologist before you bill, not after the denial.

A few minutes of checking per claim costs far less than an appeal with an EOMN letter. Split-billing practices gain the most. A missing modifier 26 can get the radiologist’s claim denied or bundled with the facility’s.

Book a demo to see how Pabau validates and tracks radiology claims, so fewer 70490 denials reach your desk.

Continue your research

Want more claims accepted on first submission? Clean claim requirements in medical billing explains what makes a claim pass on first submission and how to build a pre-submission checklist.

Trying to reduce your practice’s denial rate overall? Denial codes in medical billing maps the most common CARC and RARC codes to their root causes and resubmission paths.

Acquired both a non-contrast and a contrast series? CPT Code 70492 covers neck CT with and without contrast, the code to bill instead of 70490 plus 70491.

Imaging the neck vessels rather than the soft tissue? CPT Code 70496 covers CT angiography of the neck.

Building a broader radiology billing workflow? What is medical billing covers the revenue cycle from order to payment posting.

Frequently asked questions