CPT code 70470 – CT head without then with contrast

Key takeaways

CPT code 70470 covers a head CT performed without contrast first, then with contrast and further sections, in a single encounter.

Modifier 26 bills the radiologist’s interpretation and modifier TC bills the facility’s equipment, staff and supplies.

Billing 70450 and 70460 together to represent a combined study triggers an NCCI bundling edit and a denial.

Medicare payment for 70470 changes with locality and place of service, so check the CMS fee schedule lookup each year.

Practice management software like Pabau submits 837P claims through Claim.MD, tracks their status, and posts remittances without manual keying.

CPT code 70470: Definition and full descriptor

CPT code 70470 is the procedure code for computed tomography of the head or brain. The study is performed without contrast material first, then with contrast material and further sections. That descriptor is set by the American Medical Association’s CPT code set.

The code sits in the Radiology section, under Diagnostic Radiology (Diagnostic Imaging), Head and Neck subsection. Its category range is 70010-76499 and its narrower group range is 70010-70559.

The combined protocol is the critical distinction. The radiologist acquires non-contrast images first, then administers contrast and acquires additional sections. Both phases are captured, interpreted, and reported as a single encounter under 70470. Billing them as two separate codes triggers NCCI bundling edits and a denial.

Radiology practices billing across several imaging modalities need the whole three-code family in front of them. The protocol on the ordering physician’s signed order decides which code applies. A radiologist’s preference at reporting time does not.

CPT 70470 vs 70450 vs 70460: Which code to use

The three head CT codes map directly to the contrast protocol ordered. Select the code from what was performed and documented on the day. Where the protocol changed mid-study, the performed protocol governs the code choice.

• 70450: Use when the radiologist performs and interprets a non-contrast CT head only. No contrast was administered. Trauma, acute hemorrhage evaluation, and screening CTs often fall here.
• 70460: Use when contrast was administered and images were acquired post-contrast only. No non-contrast phase was performed first.
• 70470: Use when both phases were performed sequentially, with non-contrast images first and contrast plus additional sections after. The combined protocol suits tumor follow-up, lesion characterization, and cases needing a baseline and enhancement comparison.

Never bill 70450 and 70460 together to represent a combined study. CMS NCCI edits bundle the pair, and payers treat it as a single-code service. The correct code for both phases in one encounter is always 70470.

Modifiers for CPT code 70470

Modifiers for CPT code 70470 follow standard radiology billing conventions. The professional and technical components are often billed separately, depending on the practice setting. The table below covers the modifiers most relevant to this code.

Modifier 59 does not guarantee payment, and appending it routinely to override edits invites audit. Document the clinical rationale in the record before you append it. Payer policies on modifier 59 vary, so verify with each payer before billing.

Medicare reimbursement for CPT 70470

Medicare reimbursement for CPT code 70470 is calculated under the Medicare Physician Fee Schedule (MPFS). The schedule applies Relative Value Units (RVUs) adjusted by the Geographic Practice Cost Index (GPCI) for each locality. Because GPCI multipliers vary by state and CMS locality code, no single national figure applies to every practice.

Verify current rates with the CMS Physician Fee Schedule lookup tool for your locality and year. Practices billing the global code receive a combined rate. Those splitting into professional (modifier 26) and technical (TC) components receive the applicable sub-component rate instead.

Facility vs non-facility rates

CPT 70470 carries different Medicare rates depending on the place of service. Non-facility rates (Place of Service 11, office) are generally higher for the professional component, because the physician absorbs overhead costs. Facility rates are lower, because the facility bills separately for that overhead.

After CMS processes the claim, the electronic remittance advice confirms the paid amount and any adjustments. Reconcile each remittance against the locality-specific MPFS figure for the date of service.

ICD-10 codes that support medical necessity

Medical necessity for CPT code 70470 is governed by CMS Local Coverage Determination (LCD) A57215. That policy covers MRI and CT scans of the head and neck. The ordering physician’s documentation must establish a clinical indication that matches a covered diagnosis code.

The table below lists commonly accepted supporting diagnoses. Each one is drawn from the ICD-10-CM codes the policy recognizes for head imaging. A claim without a covered diagnosis code may be denied as medically unnecessary.

These codes may support medical necessity under LCD A57215. They do not guarantee coverage. The documentation must substantiate why the combined protocol is indicated rather than a simpler non-contrast study. Use specific rather than unspecified ICD-10 codes where the diagnosis is established.

Documentation requirements for the combined protocol

Documentation for CPT code 70470 claims must establish medical necessity for the combined protocol specifically. Support for a head CT in general will not carry the claim. Capturing every required field at the point of order reduces rework downstream.

• Ordering physician’s signed order: Must specify the clinical indication, the relevant history, and that contrast is required. An order for “CT head” without a contrast specification does not support 70470 billing.
• Clinical rationale in the record: The ordering note must explain why the combined protocol is needed. “Rule out mass lesion” or “known metastatic disease, assess enhancement” satisfies this. “Patient request” does not.
• Radiologist’s final report: Must document both phases and describe findings on non-contrast and contrast images separately. It must also reference the clinical question the ordering physician posed.
• Contrast administration documentation: The imaging record must confirm the type, dose, and route of contrast administered, plus any adverse reaction monitoring. Missing contrast documentation triggers technical denials even when the radiology report is complete.
• Supporting ICD-10 codes: At least one covered diagnosis code from LCD A57215 must appear on the claim. The diagnosis must match the ordering physician’s documentation, and the billing team never adds one without a clinical basis.

Radiology billing staff should build this checklist into the order workflow. Catching an incomplete order before the scan costs far less than correcting the claim afterward.

Bundling rules and NCCI edits

The National Correct Coding Initiative (NCCI) establishes which codes cannot be billed together without a modifier override. For CPT code 70470, the important bundling relationships involve the sibling head CT codes.

• 70470 and 70460: These two codes are an NCCI bundled pair. Billing them together for the same patient on the same date is not permitted. The combined-protocol code already includes the contrast phase that 70460 describes.
• 70470 and 70450: 70450 bundles with 70470 as well, because the non-contrast phase is included in the 70470 descriptor. Billing both for a single combined-protocol study violates the edit.
• Modifier 59 override: Modifier 59 may be appended when a distinct, separate service occurred. One example is a standalone non-contrast CT interpreted for one clinical reason, followed later that day by a combined-protocol CT ordered for a different indication. That scenario needs robust documentation and attracts payer scrutiny. Routine use of modifier 59 to bypass bundling edits carries compliance risk.

NCCI edit tables are updated quarterly, so verify current edit pairs through the CMS NCCI tools before you assume a pair has held. A structured denial management process catches NCCI rejections quickly and routes them to the right appeal path.

Related CPT codes in the head and neck CT family

CPT code 70470 belongs to the head and neck CT family, which spans codes 70450 through 70498. The family follows one pattern across four anatomic regions, shown in the grid below. The AAPC Codify CPT lookup gives searchable access to every code in the range.

CT angiography codes 70496 and 70498 are distinct services from the standard head CT codes. They require different clinical indications, carry separate reimbursement rates, and have their own NCCI edit pairs. Never substitute a CTA code for a standard CT code on the basis of contrast use alone.

How to bill CPT 70470: Step-by-step for radiology practices

Billing CPT code 70470 correctly means getting several steps right in sequence. A wrong code, a missing modifier, or a weak ICD-10 link each produces a denial. Fixing one afterward takes longer than preventing it. Here is the workflow for radiology billing teams.

1. Verify eligibility and benefits: Confirm the patient’s coverage, deductible status, and whether the plan requires prior authorization for CT with contrast. Run the check before the scan date.
2. Confirm the protocol from the order: The order must specify the combined protocol. If it reads only “CT head” or “CT head with contrast,” contact the ordering physician before selecting 70470.
3. Select the correct code: Use 70470 only when both phases were acquired and interpreted in the same encounter. Use 70450 for non-contrast only and 70460 for contrast only.
4. Apply the correct modifiers: Add modifier 26 for interpretation only, or TC for the technical component only. Append 76 or 77 for a documented repeat procedure on the same date.
5. Link appropriate ICD-10 codes: Attach at least one covered diagnosis code matching the ordering physician’s documented indication. Verify it is covered under LCD A57215.
6. Submit the claim: Build the claim in the 837P format and route it through your clearinghouse. Include the correct place of service code so the right facility or non-facility rate applies.
7. Monitor and reconcile: Track claim status and review remittances when payment posts. Flag denials tied to NCCI edits, medical necessity, and modifier errors, then route them to the appeal path within the payer’s filing window.

How claims management software handles 70470 billing

Most radiology billing teams work 70470 across three systems. Eligibility sits with the payer portal, the charge sits in the imaging system, and the claim file is built somewhere else again. Each handoff is a chance to lose the modifier or the diagnosis link.

Practice management software like Pabau keeps the sequence in one place. Pabau’s medical claims management tools integrate with Claim.MD to check eligibility before the study is booked. The same record carries the CPT code, its modifiers, and the supporting ICD-10 codes into an 837P claim.

Claims route to more than 4,000 US payers, and 835 remittances post back against the original charge automatically. Radiology billing staff then see which 70470 claims paid, which hit an NCCI edit, and which need an appeal.

Streamline radiology billing with Pabau

Pabau integrates with Claim.MD to submit CPT 70470 claims electronically, verify eligibility before each study, and post remittances automatically. See how radiology billing teams use Pabau to reduce first-pass denials.

Book a demo

Conclusion

CPT code 70470 is the right code when both phases of a head CT are ordered, performed, and interpreted in one encounter. The costly errors on this code are all preventable. A missing modifier, a weak ICD-10 link, and 70450 or 70460 billed alongside 70470 account for most of them.

Build the check into the order, before the scanner is booked. A protocol stated on the signed order, a covered diagnosis, and the right component modifier settle the coding question early.

Answering it there costs far less than appealing later. Book a demo to see how Pabau runs that sequence for radiology billing teams.

Continue your research

Need to understand how clearinghouse submissions work for imaging codes? Medical claims clearinghouse guide covers how 837P claims flow from practice to payer.

Trying to reduce denied radiology claims? Revenue cycle management overview explains the end-to-end billing workflow for imaging practices.

Want to understand Claim.MD pricing before integrating? Claim.MD pricing breakdown covers what clearinghouse fees look like in practice.

Frequently asked questions