CPT® Code 71046

Quick Reference

• Code definition: CPT 71046 reports a radiologic examination of the chest capturing exactly two projections, most commonly the posteroanterior (PA) and lateral views obtained in an ambulatory or outpatient setting.
• Key billing rule: View count is the sole differentiator within the 71045 to 71048 family. Clinical complexity never justifies upcoding; report the code matching the number of views documented in the radiology report, not the order.
• Modifier essentials: PCTC indicator = 1 supports global (no modifier), professional component (modifier 26), and technical component (modifier TC) billing. The three variants cannot be billed simultaneously for the same service; TC and 26 together equal the global.
• Documentation must-have: A radiologist-signed interpretation report with clinical indication, technique, findings, and impression is required to support the professional component. Incidental image review without a formal signed report does not support billing modifier 26 [1].
• Top confusion point: Portable/bedside AP chest X-rays obtained in the ICU or ED are single-view exams and must be reported as 71045. Billing 71046 for a one-view portable AP is upcoding regardless of clinical acuity.
• Payer alert: Medicare does not cover chest X-rays as a routine screening benefit and does not reimburse pre-operative chest X-rays without a patient-specific documented clinical indication. An ABN is required before service when medical necessity is questionable [2] [7].
• MUE: Maximum 2 units per date of service with MAI = 3 (date-of-service edit; cannot be overridden by modifier) [3].

When to Use This Code

CPT 71046 applies when exactly two chest projections are obtained and documented. The standard outpatient combination is the PA view plus the lateral view. The PA view (patient's back toward the beam) is preferred over the AP view in ambulatory settings because it minimizes cardiac magnification; the lateral view adds depth to localize lesions, evaluate the retrosternal and retrocardiac spaces, posterior costophrenic angles, and vertebral bodies. The PA + lateral pairing provides substantially more diagnostic information than a single AP view and is the workhorse of outpatient chest imaging.

Other two-view combinations reportable under 71046 include AP + lateral, PA + apical lordotic (to improve visualization of upper lobe pathology), and AP + lateral decubitus (to assess whether pleural fluid is free-flowing or loculated). The code is agnostic to which two views are obtained; view count alone distinguishes 71046 from its siblings.

Clinical indications include:

• New or worsening cough, dyspnea, or chest pain requiring radiographic workup
• Suspected pneumonia, pleural effusion, pneumothorax, or hemothorax
• Heart failure monitoring for pulmonary edema progression or response to treatment
• Pulmonary nodule detection and follow-up imaging
• Suspected lung mass, mediastinal abnormality, or TB evaluation
• Post-thoracic procedure assessment (distinct from PICC tip confirmation; see bundling rules below)
• Pre-operative evaluation when a patient-specific clinical indication is documented

Scope boundaries: This code covers plain-film radiography only, whether digital or conventional film. Contrast-enhanced imaging of the chest uses CT codes (71250, 71260, 71270). Fluoroscopic studies carry separate codes. Portable AP exams, virtually always single-view, belong under 71045.

Setting and supervision: A qualified radiologic technologist performs the exam under general supervision. The supervising physician need not be physically present during image acquisition but must be available and the service must fall within the practice scope [4]. The technical and professional components may be billed globally by one entity or split between a facility (TC) and an interpreting physician (modifier 26).

CPT guideline restrictions to know:

Do not report 71046 on the same date as PICC insertion codes 36572, 36573, or 36584 when the chest X-ray is for catheter tip confirmation. Those PICC codes include confirmation of catheter tip location; if confirmation is not performed, report 36572, 36573, or 36584 with modifier 52.

When 71046 is performed during a critical care encounter by the physician providing critical care, it is bundled into the critical care payment and cannot be billed separately by that physician. Facilities may bill separately.

Code Differentiation Table

The critical differentiator is the view count documented in the radiology report, not the clinical complexity, the setting, or the number of findings. A standing PA + lateral for a routine outpatient cough is 71046. A portable AP for a critically ill intubated patient is 71045. Coders must verify view count from the report, not from the order.

flowchart TD
    A[Chest X-Ray Performed] --> B{How many views documented in report?}
    B -->|1 view| C[71045]
    B -->|2 views| D[71046]
    B -->|3 views| E[71047]
    B -->|4 or more views| F[71048]
    C --> G{Portable or bedside?}
    G -->|Yes| H[71045 - typical ICU/ED portable AP]
    G -->|No| I[71045 - outpatient single view]

Billing & Modifier Rules

TC/26 split billing:

PCTC indicator = 1 supports three distinct billing arrangements for 71046:

• Global (no modifier): Bill when the same provider group both owns the imaging equipment and employs or contracts with the interpreting radiologist. Applies to private radiology practices with their own X-ray units performing and interpreting their own studies.
• Modifier 26 (Professional Component): Bill when the physician interprets but does not own the imaging equipment. Applies to radiologists reading hospital or clinic images, teleradiology reads, and employed radiologists interpreting studies in hospital settings. The 2026 MPFS professional component payment is approximately $10.02 [4].
• Modifier TC (Technical Component): Bill when the entity owns and operates the equipment but a separate physician provides the interpretation. Hospitals billing under OPPS and imaging centers with contracted independent radiologists bill TC. The 2026 MPFS technical component payment is approximately $23.05 [4].

Billing the global and either TC or modifier 26 simultaneously for the same service results in duplicate payment. The TC and modifier 26 components together equal the global.

Technology modifiers:

• Modifier FY: Append when the X-ray is taken using computed radiography (cassette-based imaging) technology, per payer policy.
• Modifier FX: Append when the X-ray is taken using conventional film, for payers requiring technology identification.

Add-on code 0174T: Report 0174T in addition to 71046 when computer-aided detection (CAD) software is used concurrently with the primary physician interpretation. Do not report 0175T in conjunction with 71046; 0175T applies to CAD performed remotely from the primary interpretation, not concurrently.

MUE and units:

The 2026 NCCI MUE for 71046 is 2 units with MAI = 3 [3]. MAI 3 applies across the entire date of service per beneficiary per billing provider and cannot be overridden by modifier attachment. Claims exceeding 2 units on the same date auto-deny. Clinically, 2 units may be appropriate when a pre-procedure 2-view exam and a post-procedure 2-view exam are both obtained on the same day, each with a separately documented clinical reason.

MUE comparison across the chest X-ray family:

Global period: XXX. No surgical global period applies. Each encounter is billed independently with no automatic bundling of related subsequent services.

Documentation Essentials

Required elements:

• View count explicitly stated: The radiology report must document the number and type of views obtained (e.g., "PA and lateral views of the chest were performed"). This is the primary record element distinguishing 71046 from 71045, 71047, and 71048. If the report documents only one view, the claim must be billed as 71045 regardless of what was ordered.
• Clinical indication: The ordering diagnosis or symptom must appear in the order and be referenced in the report. "Chest X-ray" as a standalone order without clinical context does not satisfy the medical necessity requirement under 42 CFR § 410.32 [2].
• Signed interpretation report: A formal report with technique, findings, and impression signed by the interpreting physician is required for the professional component. CMS IOM Pub. 100-02, Ch. 15 § 80 requires personal physician review; technologist descriptions or unsigned templated reports do not meet this standard [1].
• Written order from an authorized provider: A physician or authorized non-physician practitioner must generate the imaging order. Radiologist self-referral without an ordering provider is non-compliant.

Audit red flags specific to 71046:

• Billing 71046 for all chest X-rays without differentiating portable from standing exams. Auditors pull the equipment used or the order specifying "portable." If the report documents a single AP view, billing 71046 creates an upcoding mismatch.
• Pre-operative chest X-rays with no patient-specific clinical indication beyond "pre-op clearance." HHS OIG identifies routine pre-op imaging as an overpayment risk.
• Missing or unsigned radiology interpretation reports when billing modifier 26. Unsigned reports, templated attestations, or technologist readings without physician review signature are denial triggers.
• Billing 71046 on the same date as 36572, 36573, or 36584 when the radiograph documents catheter tip position. PICC insertion codes include tip confirmation; a separate chest X-ray for this purpose is non-separately billable.

Medicare, Commercial & Medicaid Payer Rules

Medicare:

No National Coverage Determination exists for chest X-rays, and no dedicated LCD for CPT 71046 has been published [5]. Coverage is adjudicated under the "reasonable and necessary" standard per Social Security Act § 1862(a)(1)(A) [6] and the medical necessity requirements at 42 CFR § 410.32 [2].

Key Medicare-specific restrictions:

• Routine screening: Medicare Part B does not cover chest X-rays as a periodic screening benefit. An exam ordered for annual health screening without a documented symptom or clinical indication is not covered. Issue an ABN before service when medical necessity is uncertain [7].
• Pre-operative chest X-rays: Medicare does not reimburse pre-op chest X-rays ordered solely for surgical clearance. The clinical indication must be patient-specific and documented (e.g., new respiratory symptoms, known COPD requiring pulmonary status assessment before anesthesia). "Pre-op workup" as the sole indication is insufficient.
• Critical care bundling: When 71046 is performed during a critical care period by the same physician providing critical care, it is bundled into critical care reimbursement (CPT 99291/99292) and is not separately billable by that physician. Facilities may bill separately.
• MUE enforcement: Maximum 2 units per date of service per MAI 3 edit. No modifier override is available [3].

2026 Medicare payment (national, pre-GPCI adjustment) [4]:

Hospital Outpatient (OPPS): The APC status indicator for 71046 is "Codes That May Be Paid Through a Composite APC." The facility bills 71046-TC under OPPS subject to composite APC packaging rules; the interpreting radiologist bills modifier 26 separately under MPFS. Verify current APC assignment, as composite packaging can suppress separate TC payment depending on other services on the same claim.

ASC: 71046 is separately payable in the ASC setting when provided integral to a surgical procedure on the ASC list, with payment based on MPFS nonfacility PE RVUs.

Commercial payers:

Most commercial payers follow Medicare's coverage logic for 71046 but may differ on several points. Some payers auto-downcode to 71045 when only AP documentation appears in the record for a claim billed as 71046, without requesting additional documentation first. Teleradiology arrangements may require the radiology report to be attached to the claim at submission for professional component billing. Prior authorization for outpatient chest X-rays is uncommon but verify for imaging bundles at high-volume outpatient sites.

Common Denials & Prevention

Denial: Wrong view count (upcoding) Automated claims editing systems cross-reference modifier 26 claims against available radiology reports. Portable equipment flags trigger review. If the report documents one AP view and the claim reflects 71046, payers downcode to 71045 and recover the difference. Prevention: Train billing staff to pull the signed radiology report before code assignment. The report governs, not the order. A PA + lateral order that results in a single AP film (e.g., patient unable to stand) must be billed as 71045.

Denial: Medical necessity not documented Claims billed for screening or routine pre-op without a covered diagnosis deny under 42 CFR § 410.32 [2]. Generic Z-codes such as Z01.810 (encounter for preprocedural cardiovascular examination) require supporting clinical documentation explaining why imaging is indicated for this specific patient. Prevention: Document the clinical indication in the order and confirm it is referenced in the radiology report. When medical necessity is questionable, issue an ABN before service. Never submit without a written order tied to a covered clinical indication.

Denial: MUE exceeded A claim billing 3 or more units of 71046 on the same date auto-denies; MAI = 3 means no modifier can unlock additional units [3]. Prevention: Audit daily billing volume for 71046. When two separate 2-view studies are clinically justified on the same day, bill 2 units and retain documentation of the distinct clinical reasons for each study (e.g., chest trauma at 8 AM; chest tube placement at 3 PM).

Denial: Bundled with PICC insertion Claims for 71046 on the same date as 36572, 36573, or 36584 deny when the chest X-ray serves as tip confirmation. Those PICC codes include tip confirmation in their service definition. Prevention: If the chest X-ray is for a distinct clinical indication unrelated to PICC placement (e.g., concurrent pneumonia workup), document the separate indication clearly and consider an X-modifier to support separate billing. If the sole purpose of the X-ray is tip confirmation, do not bill 71046.

Denial: No signed interpretation report for modifier 26 Unsigned reports, templated attestations without evidence of personal physician review, or technologist descriptions are rejected by MAC auditors applying the physician interpretation requirement [1]. Prevention: Confirm a signed, finalized report is on file before claim submission. Electronic attestation is acceptable when it constitutes a legal signature under the practice's EHR policies.

Coding Scenarios

Scenario 1: A 65-year-old presents to a pulmonology practice with two weeks of productive cough and low-grade fever. The physician orders a PA and lateral chest X-ray. The practice owns the digital X-ray unit and the ordering pulmonologist personally reviews and signs the interpretation report the same day.

Correct coding: 71046 (global, no modifier) with R05.9 (cough, unspecified)

Why: The same entity performs both the technical and professional components, making global billing appropriate. Two views are documented in the signed report, confirming 71046 over 71045.

Scenario 2: A hospitalist orders a PA and lateral chest X-ray for a Medicare patient admitted for acute decompensated heart failure. The hospital's radiology equipment is used; an independent radiology group provides the signed interpretation under a professional services agreement.

Correct coding: Hospital bills 71046-TC under OPPS. Radiologist bills 71046-26 under MPFS with I50.9 (heart failure, unspecified).

Why: The hospital owns the equipment and bills TC; the independent interpreting physician bills modifier 26. Either party billing the global would create a duplicate payment scenario.

Scenario 3: An ICU patient is intubated for respiratory failure. A portable AP chest X-ray is ordered to assess endotracheal tube position. The radiology report documents "single AP supine view obtained."

Correct coding: 71045, not 71046.

Why: One view is obtained and documented. Clinical acuity does not change the view count. Billing 71046 for a single-view portable AP misrepresents the service; the report governs.

Scenario 4: A surgeon schedules a healthy 44-year-old for elective laparoscopic cholecystectomy. With no cardiac or pulmonary history, the surgeon orders a "routine pre-op chest X-ray" with no additional clinical documentation.

Correct coding: An ABN must be issued and signed by the patient before the service. If no ABN is obtained and Medicare denies, the provider cannot bill the patient.

Why: Medicare does not cover routine pre-operative chest X-rays absent a patient-specific clinical indication [2] [7]. "Pre-op clearance" alone does not satisfy 42 CFR § 410.32. Without ABN documentation, the financial liability falls on the provider.

Related Codes

• 71045 — Radiologic exam, chest; single view. Use for all portable AP exams and any encounter where exactly one projection is obtained.
• 71047 — Radiologic exam, chest; 3 views. Use when exactly three projections are documented.
• 71048 — Radiologic exam, chest; 4 or more views. Use for comprehensive chest series with multiple additional projections.
• 71035 — Radiologic exam, chest; special views. Active code for non-standard projections; may be separately reportable alongside 71046.
• 0174T — Computer-aided detection (CAD), chest radiograph, concurrent with primary interpretation. Add-on to 71046 when CAD software is used during the read.
• 0175T — CAD, chest radiograph, performed remote from primary interpretation. Do not report with 71046; applies to remote CAD only.
• 36572 — PICC insertion without subcutaneous port or pump, younger than 5 years. Do not separately bill 71046 for catheter tip confirmation on the same date.
• 36573 — PICC insertion without subcutaneous port or pump, age 5 years and older. Same bundling restriction as 36572.
• 36584 — Replacement of peripherally inserted central venous catheter (PICC). Do not separately bill 71046 for tip confirmation on the same date.

Sources

1. CMS IOM Publication 100-02, Medicare Benefit Policy Manual, Chapter 15 §80 — CMS — Physician interpretation requirement for billing the professional component of diagnostic X-ray services.
2. 42 CFR § 410.32 — Diagnostic X-ray tests; conditions for coverage — eCFR — Physician order, medical necessity documentation, and supervision requirements for diagnostic X-rays; basis for pre-op and screening coverage restrictions.
3. CMS NCCI Practitioner Services MUE Table, 2026 Q2 — CMS — MUE = 2, MAI = 3 for CPT 71046, effective April 1, 2026.
4. CMS 2026 National Physician Fee Schedule Relative Value File — CMS — RVU data, PCTC indicators, supervision levels, and 2026 payment calculations for 71046.
5. CMS Medicare Coverage Database — CMS — No active NCD or dedicated LCD identified for CPT 71046 as of March 2026.
6. Social Security Act § 1862(a)(1)(A) — SSA — Reasonable and necessary standard governing Medicare coverage determinations in the absence of an NCD.
7. 42 CFR § 411.408 — ABN requirements — eCFR — Advance Beneficiary Notice regulations governing when ABNs are required and provider financial liability.