CPT code 73560: Knee X-ray billing, reimbursement, and modifiers

Key takeaways

CPT code 73560 describes a radiologic examination of the knee with 1 or 2 views, maintained by the American Medical Association.

The 2026 Medicare national average runs about $22 to $28 for the professional component and $15 to $20 for the technical component.

Upcoding to 73562 or 73564 when the report documents only 1 or 2 views is the most common denial trigger in this family.

CPT 73565 is a bilateral standing anteroposterior view of both knees, not a substitute for billing 73560 on each side.

Practice management software like Pabau supports clean claim submission for radiology and orthopedic practices, including bilateral modifier application.

CPT code 73560 is the billable code for a radiologic examination of the knee with 1 or 2 views. The American Medical Association (AMA) maintains it in the diagnostic radiology section of the CPT code set.

This reference covers the official descriptor, Medicare rates, modifier rules, the ICD-10 crosswalk, documentation requirements, and the billing errors that trigger denials.

The code-family comparison and modifier guide below matter most to orthopedic practices, urgent care centers, and radiology groups that bill in-house. Knowing what separates 73560 from 73562 and 73564 catches selection errors before a claim reaches the payer.

CPT code 73560: Definition and official descriptor

CPT code 73560 captures a radiologic examination of the knee with 1 or 2 views. The full AMA descriptor reads: Radiologic examination, knee; 1 or 2 views. The code sits in the Diagnostic Radiology (Diagnostic Imaging) subsection of the CPT manual, which covers conventional X-ray procedures for the knee joint.

The code applies only when 1 or 2 views are captured. Three views moves the claim to 73562, and four or more requires 73564. Confirm the view count documented in the radiology report before selecting from this family. The ladder below reads in the same order a coder works, from the report to the code.

Clinical indications: When is a 1 or 2 view knee X-ray ordered?

A 1 or 2 view knee X-ray answers a specific, time-sensitive clinical question rather than surveying the whole joint. Ordering providers request this view count in straightforward presentations, where a focused image settles the question on its own.

• Acute knee trauma: Initial evaluation of suspected fracture after falls, sports injuries, or direct blows. A single AP or lateral view often confirms or excludes a cortical break quickly.
• Knee pain with low complexity: Anterior or medial knee pain without red flags. Degenerative change or a loose body is the primary differential.
• Post-reduction check: Confirming joint congruence following a patella dislocation reduction, without a full multi-view series.
• Pre-operative planning (limited): A focused view when the surgeon needs a current weight-bearing or lateral image before a minor procedure.
• Follow-up imaging: Monitoring known osteoarthritis or a healing fracture where a single anatomical plane is sufficient.
• Effusion assessment: Lateral view to detect joint effusion in the suprapatellar pouch.

Medical necessity must be supported by a documented clinical indication. Payers routinely deny claims where the ordering note does not reflect a condition that warrants imaging. Local Coverage Determinations (LCDs) issued by Medicare Administrative Contractors set the diagnosis requirements for each region.

Medicare reimbursement and fee schedule for CPT 73560

The CMS Physician Fee Schedule sets national payment rates for CPT code 73560, adjusted by geographic pricing locality. The figures below reflect national averages from available fee schedule data.

Always verify the current year’s rates in the CMS MPFS Look-Up Tool before submitting claims, since rates are updated annually. Geographic adjustment factors can move reimbursement by 15-25% either way, depending on locality.

Rates apply at the place of service level. Hospital outpatient departments (POS 22) typically reimburse at the facility rate. Physician offices (POS 11) and independent imaging centers (POS 19) may qualify for non-facility rates when billing the global service.

Use the FastRVU 2026 RVU lookup to check work, practice expense, and malpractice RVU values for 73560 in your locality.

Practices can make reimbursement more predictable by routing claims through a clearinghouse that validates the data before submission. Practice management software like Pabau submits electronic claims through Claim.MD, which reaches thousands of commercial and government payers. Real-time eligibility checks and 835 ERA retrieval let billing teams reconcile payments faster.

Applicable modifiers for CPT code 73560

Modifier selection is where most 73560 billing errors originate. The correct modifier depends on who performs and interprets the study, where the service is rendered, and whether both knees are imaged.

Bilateral billing is where payer policy diverges most sharply. Medicare generally accepts modifier 50 on a single claim line with 73560, paid at 150% of the allowed amount. Some MACs require two separate lines with RT and LT instead.

Check your MAC’s LCD and the payer’s own billing guide before submitting bilateral knee claims. Misapplying the bilateral rule produces systematic underpayments or denials that are hard to audit after the fact.

ICD-10 codes that support medical necessity for knee X-ray billing

Pairing CPT code 73560 with a specific, well-documented ICD-10-CM diagnosis is the single most important step in establishing medical necessity.

The table below covers the most commonly paired diagnoses, and it is not exhaustive. The wider ICD-10-CM code index carries the full set, and your MAC’s Local Coverage Determinations decide which are covered in your region.

Use the most specific laterality code available. Bilateral diagnoses such as M17.0 pair with bilateral claim submissions using modifier 50 or RT/LT. Avoid non-specific pain codes like M25.569 as a standalone diagnosis when a more precise code exists. Payers increasingly flag them as insufficient to establish medical necessity.

Documentation requirements for billing a knee X-ray

Complete documentation protects the claim and supports audit defense. Every element below must appear in the patient record before the claim goes out. A payer can request records or issue a denial over any single missing item.

• Ordering provider identity: Name and NPI of the physician or qualified provider who ordered the study, with the clinical indication documented in their note.
• Clinical indication: A specific symptom, diagnosis, or clinical question the imaging is meant to answer, matching the ICD-10 code on the claim.
• View count: The radiology report or technologist note must state how many views were obtained. “AP and lateral” confirms 2 views for 73560.
• Interpretation report: A signed, dated interpretation report from the reading physician. This is the primary documentation for the professional component (modifier 26).
• Patient demographics: Date of service, patient name, date of birth, and insurance details matching the claim.
• Place of service: A POS code that matches where the service was physically performed.

A structured superbill that captures view count and clinical indication at the point of service keeps documentation complete. Practices that pre-populate the superbill template with the 73560-73564 family and its modifiers catch selection errors before the claim leaves the office.

Common billing errors and how to avoid them

Five billing patterns generate most of the denials and compliance risk on CPT code 73560. Each one maps to a process failure that can be corrected at the point of claim creation.

• Upcoding to 73562 or 73564: The report documents 1 or 2 views, but the claim carries a 3-view or 4-view code. This is the family’s most serious error. When in doubt, confirm the count with the reading radiologist.
• Missing the professional/technical split: Physician practices that own imaging equipment may bill 73560 globally without modifiers. Those that do not own the equipment must append modifier 26. Billing globally in a split arrangement overstates the claim.
• Incorrect bilateral modifier: Appending modifier 50 when the payer wants RT/LT on two lines, or the reverse, produces a systematic denial pattern. Check the MAC’s published guidance before defaulting to modifier 50.
• Reporting 73565 instead of 73560 twice: CPT 73565 covers both knees, standing, anteroposterior. That is one bilateral weight-bearing view, not two standard knee X-rays. Using it for routine bilateral imaging is an improper code selection.
• Non-specific ICD-10 codes: M25.569 (pain in unspecified knee) as the sole diagnosis raises the medical necessity denial rate. Capture laterality in the diagnosis whenever a lateralized code exists.

Denial patterns on 73560 usually trace back to the claim-creation workflow rather than deliberate coding choices. Claims software for imaging practices can flag a missing modifier or a code-family mismatch at the moment the claim is built. Tracking denial reason codes by CPT code then shows billing teams which payers reject the same item repeatedly.

Related CPT codes: 73562, 73564, and 73565

The knee X-ray code family covers four distinct scenarios. Selecting among them requires knowing how many views appear in the radiology report, not how many were ordered.

The AAPC Codify CPT lookup carries the full descriptor for each code in this family.

A practical rule sorts most claims. If the report says “AP and lateral knee,” that is 2 views and 73560 is correct. If it lists AP, lateral, and a tunnel or Merchant view, that is 3 views and 73562 applies. Never assign a higher code without explicit view documentation.

CPT 73560 vs knee MRI codes 73721 and 73722

X-ray and MRI serve different diagnostic purposes for knee pathology and are billed separately. Understanding the clinical pathway prevents inappropriate code selection when both are ordered in a single encounter.

When X-ray and MRI are ordered on the same date of service, both codes may be billed. The clinical documentation has to support each one as independently indicated.

X-ray commonly precedes MRI in the diagnostic pathway. The AP and lateral view rules out fracture and checks alignment before MRI looks at soft tissue. Check NCCI bundling edits before billing 73560 and 73721 together, since an edit may prohibit the pair for a specific payer.

Bilateral knee X-ray billing: Can you bill CPT 73560 twice?

Yes, both knees can be billed when both are examined, but the method depends on payer policy. Reporting bilateral imaging for CPT code 73560 means choosing between two approaches. The wrong choice for a given payer produces systematic denials or underpayment.

• Modifier 50 on one line: Bill 73560-50 on a single claim line. Medicare and many commercial payers accept this at 150% of the allowed amount. The payer treats it as two procedures, so no second line is needed.
• RT and LT on two separate lines: Bill 73560-RT on line 1 and 73560-LT on line 2, each at 100% of the allowed amount. Some MACs require this format. Total reimbursement is equivalent, but the line-item structure differs.
• Do not report 73565: CPT 73565 covers both knees, standing, anteroposterior, which is one bilateral weight-bearing view. It is not a substitute for standard imaging of both knees.
• Separate clinical indications matter: If only one knee has a documented indication, the second image may be denied. Both sides need supporting diagnosis codes on the claim.

Reviewing electronic remittance advice on bilateral 73560 claims shows which payer applied the denial and why. A payer-specific reference sheet for bilateral radiology billing takes the trial and error out of the next claim. Refresh it each year, when MACs republish their LCDs.

How Pabau keeps knee X-ray claims accurate before they go out

Most radiology billing still runs on memory and a printed cheat sheet. A coder reads the report, recalls which view count maps to which code, and types the modifier by hand. Each of those steps is a place where 73560 turns into 73562, or where a bilateral claim goes out with the wrong modifier.

Pabau keeps the code, the modifier, and the supporting diagnosis on the same record as the imaging appointment. Billing staff build the claim from what the clinician documented, rather than from a separate spreadsheet. Claims then go out electronically through Claim.MD, with eligibility checked before the patient is imaged.

The outcome is fewer claims coming back over a view count or a missing modifier. Remittance advice lands in the same place, so a denial on 73560 surfaces the week it happens rather than at month end. Every Pabau subscription includes the full feature set, so claims tooling is never a separate tier.

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Pabau’s claims management software helps orthopedic and imaging practices submit clean claims, with modifier application, ICD-10 crosswalks, and ERA reconciliation built into the workflow.

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Conclusion

Three checks decide whether a 73560 claim survives. Count the views in the signed report. Match the modifier to the payer’s bilateral rule. Pair the code with the most specific lateralized ICD-10 diagnosis the record supports.

Building those checks into claim creation costs far less than working the denials afterward. A practice that fixes the workflow once stops re-arguing the same rejection every quarter. The trade-off is the up-front discipline of documenting view count at the point of service, every time.

Book a demo to see how Pabau carries a knee X-ray from the imaging appointment through to the remittance.

Continue your research

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Want to reduce denial rates across all imaging codes? Denial codes in medical billing covers the most common CARC codes and how to respond to each.

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