CPT code 70220 – Paranasal sinus X-ray series, complete

Key Takeaways

CPT code 70220 covers a complete paranasal sinus X-ray series requiring a minimum of 3 views, distinguishing it from the partial series under CPT 70210.

The three standard projections are Waters, Caldwell, lateral, and submentovertex; the radiology report must document each view obtained.

Modifier 26 (professional component) or TC (technical component) must be appended when billing is split between the interpreting physician and the facility.

Pabau’s claims management software flags incomplete radiology documentation before submission, reducing 70220 denials from missing view counts.

CPT code 70220: Official descriptor and procedure overview

CPT code 70220 is defined by the American Medical Association with the official descriptor: Radiologic examination, paranasal sinuses, complete, minimum of 3 views. The code belongs to the Diagnostic Radiology section of the CPT code set, specifically the subsection covering head and neck imaging.

Clinicians order this study to evaluate acute or chronic sinusitis, assess post-operative sinus cavities, or investigate facial trauma when CT imaging is not immediately available or clinically indicated. The plain-film series captures fluid levels, mucosal thickening, and bony changes across multiple sinus compartments.

View requirements and documentation standards

A complete paranasal sinus series requires a minimum of three radiographic projections. The most common combination includes the Waters view (occipitomental), Caldwell view (occipitofrontal), and lateral view. A submentovertex (jug-handle) view is added when sphenoid or ethmoid visualization is specifically needed.

Every view must be explicitly documented. Payers audit the radiology report for a list of projections obtained; a report that says “sinus X-rays performed” without naming the individual views does not support CPT code 70220. The report should state each projection by name and note the radiologist’s interpretation of each.

• Waters view: Primary projection for maxillary sinuses and orbital floors
• Caldwell view: Frontal sinuses, ethmoid air cells, and nasal septum
• Lateral view: Sphenoid sinus, posterior ethmoid cells, and overall sinus depth
• Submentovertex view: Added when sphenoid or ethmoid detail is clinically required

The ordering provider’s documentation must also reflect the clinical indication that prompted the study. A note that simply records “sinus X-ray ordered” without documenting presenting symptoms, duration, or prior treatment is insufficient to establish medical necessity. Payers cross-reference the physician’s encounter note against the radiology report when adjudicating claims. Sound medical billing fundamentals start with complete documentation at the point of care, before the claim is ever submitted.

CPT 70220 vs CPT 70210: Choosing the right code

CPT 70210 covers a limited paranasal sinus radiologic examination with fewer than three views; CPT code 70220 covers the complete series with a minimum of three. The distinction is entirely view-count driven, not anatomically driven.

When only two projections are obtained because a patient cannot cooperate or positioning is limited, do not bill CPT code 70220. Submit 70210 and document the clinical reason for the reduced series. Submitting 70220 for a two-view study is an upcoding violation regardless of intent.

CT sinus codes (70486, 70487, 70488) are in a separate family. CPT 70486 covers CT paranasal sinuses without contrast, 70487 with contrast, and 70488 with and without. Billing CPT code 70220 and a sinus CT on the same date of service for the same clinical indication will trigger National Correct Coding Initiative (NCCI) edit review and is likely to result in one code being denied. Consult the current NCCI edit tables before billing both on the same day.

ICD-10 diagnosis codes that support CPT code 70220

Payers validate that the submitted ICD-10-CM diagnosis code establishes medical necessity for a complete paranasal sinus radiologic examination. The CDC ICD-10-CM lookup tool is the authoritative source for current code descriptors and effective dates.

Nonspecific symptom codes (headache, facial pain) often fail MAC medical necessity review for sinus plain films. If the clinical documentation supports a sinusitis diagnosis, code the specific condition rather than the symptom. Symptom codes are acceptable when a definitive sinusitis diagnosis has not yet been established, but payers may require a more specific code on appeal.

Modifiers for CPT code 70220

Modifier selection for CPT code 70220 depends on the place of service and billing arrangement. Radiology codes use a global billing model that encompasses both the technical component (equipment, film, technologist) and the professional component (physician interpretation and report).

Applying modifier 52 when fewer views are obtained keeps the code at 70220 but signals reduced service. Many billers instead downcode to 70210, which is cleaner. If you use modifier 52 on 70220, document the specific clinical reason (patient uncooperative, positioning contraindicated) in both the encounter note and the radiology report.

Medicare reimbursement for CPT code 70220

Medicare payment for CPT code 70220 is set annually through the Medicare Physician Fee Schedule (MPFS). Rates vary by geographic location and by whether the service is billed globally, as the professional component only (modifier 26), or as the technical component only (modifier TC). The CMS MPFS lookup tool is the only authoritative source for current-year rates; any figure not pulled directly from that tool and dated to the current fee schedule year should not be published or relied upon for financial planning.

CMS designates a -day global period for CPT code 70220, confirming that no post-service visits are bundled into the payment. Work RVU values and the corresponding national payment amounts can be verified using the FastRVU 2026 RVU lookup, which imports current CMS data and applies the geographic adjustment factor for any Medicare Administrative Contractor (MAC) jurisdiction.

Commercial payers typically reimburse at a percentage of the Medicare fee schedule, though contracted rates vary. Prior authorization is not universally required for sinus plain films, but some Medicare Advantage plans and commercial payers have implemented authorization requirements for all outpatient imaging. Verify payer-specific policies before scheduling the study when time permits.

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Medical necessity and documentation requirements

MAC Local Coverage Determinations (LCDs) govern which clinical indications support Medicare payment for sinus plain films. LCD policies vary by jurisdiction; the applicable LCD number and version date should be referenced in any internal policy documentation. Broadly, payers expect the ordering provider’s note to include all of the following before a CPT code 70220 claim will clear prepayment review:

• Presenting symptoms (facial pain, nasal congestion, purulent discharge, headache) with onset date and duration
• Relevant clinical history, including prior episodes and any treatments already attempted
• Specific clinical indication for plain-film imaging rather than watchful waiting or empiric treatment
• Ordering rationale, particularly when CT sinuses were not ordered instead

The medical billing compliance challenge here is that the radiology department receives the order and performs the study, but the medical necessity documentation lives in the ordering provider’s note. Coordinating between the ordering clinic and the radiology practice is where most documentation gaps appear. Ensuring the ordering encounter note is complete before the study is performed prevents the most common pre-payment audit findings for CPT code 70220.

Common denial reasons for CPT code 70220 and corrective actions

Understanding why CPT code 70220 claims are denied is the fastest path to improving first-pass payment rates. The table below maps the most frequent denial categories to their root cause and the corrective action that resolves each one.

Tracking denial patterns by CARC (Claim Adjustment Reason Code) is the most efficient way to identify systemic documentation problems. Denial codes in medical billing map directly to the corrective action required. Practices that log denial reasons by CPT code can pinpoint whether a 70220 denial surge is a documentation issue, a modifier issue, or a diagnosis pairing problem rather than chasing individual claims one at a time.

Effective denial management workflows for radiology codes include a pre-submission view-count audit, a diagnosis pairing crosswalk check, and an NCCI edit screen before the claim leaves the practice. Each of these steps catches a different category of 70220 denial upstream rather than downstream.

Billing CPT code 70220 in practice: Workflow tips

An end-to-end billing workflow for CPT code 70220 covers five checkpoints. Missing any one of them produces a predictable denial category.

1. Order verification: Confirm the ordering provider’s note documents presenting symptoms, duration, and clinical rationale. The note must exist and be complete before imaging is performed.
2. View count audit: After the radiology report is generated, count the named projections. Three or more supports 70220; fewer than three requires downcoding to 70210 or requesting a radiologist addendum.
3. Diagnosis pairing: Match the radiology report’s clinical impression against the ordering note’s diagnosis. Select the most specific ICD-10-CM sinusitis code the documentation supports, verified against the applicable MAC LCD.
4. Modifier assignment: Determine the billing arrangement (global, professional component only, technical component only) and assign the correct modifier based on place of service and payer contract.
5. Clearinghouse submission and tracking: Submit the claim electronically and track the response. Pabau integrates with electronic claims via Claim.MD, enabling real-time eligibility verification and electronic remittance advice (ERA) posting so denials are matched against the original claim automatically rather than manually reconciled.

Practice management systems that surface documentation gaps before submission, rather than after denial, make a material difference to first-pass payment rates for diagnostic radiology. Pabau’s radiology claims management tools are built to flag incomplete documentation fields and route claims through the Claim.MD clearinghouse, which covers more than 4,000 US payers, including real-time eligibility verification and 835 remittance file processing. That means a denied 70220 claim surfaces with its CARC code the same day rather than weeks later.

Revenue cycle managers who also need broader context on how coding fits into the payment cycle will find the full revenue cycle management overview useful when building out radiology billing protocols.

Conclusion

CPT code 70220 is straightforward to bill correctly when the radiology report names the projections and the ordering note documents the clinical indication. The most preventable denials trace back to view-count mismatches and nonspecific ICD-10 diagnosis coding, both of which are upstream documentation problems, not billing errors.

Pabau’s integrated claims management and Claim.MD clearinghouse connection gives radiology and multi-specialty practices a pre-submission documentation check and same-day denial visibility. Book a demo to see how the workflow works for your coding team.

Continue your research

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Want to see how ERA files reduce manual posting for diagnostic imaging? Electronic remittance advice explains 835 file structure and how automated ERA posting eliminates manual denial reconciliation.

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