CPT
70450 — CT scan of head/brain without contrast
Same scan can cost 5x more at a hospital than at an imaging center.
Imaging
73564 — Radiologic examination, knee; 4 or more views
An X-ray of the knee taken from four or more different angles, providing a comprehensive evaluation of bone, joint space, and alignment.
- Typical setting: Hospital, imaging center, urgent care
- National avg charge (illustrative): $40–$95 Medicare allowed; $60–$220 commercial; varies by region
- Most-disputed reason: Billing 73564 (4+ views) when only 3 views were obtained — should be 73562; always confirm view count from the radiology report
What it means
What 73564 actually means
An X-ray of the knee taken from four or more different angles, providing a comprehensive evaluation of bone, joint space, and alignment. This level of detail is used for complex knee evaluations including preoperative planning or detailed arthritis assessment.
Common errors with this code
What goes wrong on real bills.
Most bills that look correct still contain at least one of these issues. Up to 49% of medical bills contain errors (CFPB).
- Billing 73564 (4+ views) when only 3 views were obtained — should be 73562; always confirm view count from the radiology report
- Billing 73564 in combination with the bilateral standing knee code (73565) without documentation that all views were distinct studies
- Missing laterality modifier (RT/LT) on unilateral knee X-ray claims
If you see 73564 on your bill
Three steps before paying.
1. Get the itemized bill. If your statement only shows a summary, request the CPT-level itemized bill before paying. Generate the request language →
2. Cross-check against the EOB. Compare what your insurer's Explanation of Benefits says you owe versus what the hospital is asking. They disagree more often than people think. Read the bill-vs-EOB guide →
3. Run a free Bill Scan. Upload the bill (and EOB if you have it) and BillBusted will flag the most likely issues with this specific code in your specific state. Run free scan →
Related codes
Other codes in this category.
People who land on 73564 often also see these adjacent codes on the same bill.
CPT
70470 — CT head/brain with and without contrast
If contrast wasn't given, 70470 is the wrong code.
CPT
70486 — CT maxillofacial area; without contrast material
Imaging — verify professional + technical components weren't double-billed.
CPT
70551 — MRI brain without contrast
Same scan can be 5x cheaper at a freestanding imaging center.
CPT
71045 — Chest X-ray, single view
Same image can cost 10x more at a hospital than a freestanding imaging center.
CPT
71046 — Chest X-ray, two views (PA + lateral)
Two-view CXR is standard. Watch the price gap between hospital and freestanding.
Related BillBusted guides
Plain-English reads if you see 73564 on a bill.
73564 FAQ
Plain-English answers.
What does 73564 usually cost?
$40–$95 Medicare allowed; $60–$220 commercial; varies by region. Costs vary by region, payer contract, and whether the service was performed in a hospital outpatient department (which adds a facility fee) versus a free-standing clinic.
What's the most common billing error on 73564?
Billing 73564 (4+ views) when only 3 views were obtained — should be 73562; always confirm view count from the radiology report
What should I do if I see 73564 on my bill?
Request the itemized bill and the matching EOB from your insurer. Compare the units/quantity billed against what you actually received. Run a free BillBusted scan to flag the most likely errors specific to 73564 before paying.
Don't pay 73564 blindly.
The free scan tells you in under 60 seconds whether this charge looks reasonable for your situation.