CPT code 73090 – Forearm X-ray, 2 views

Key takeaways

CPT code 73090 covers a two-view X-ray of the radius and ulna, not the elbow (73080) or wrist (73100 or 73110).

Modifier -26 bills the interpretation only, modifier -TC bills the technical component only, and no modifier means a global bill.

Most payers expect a laterality modifier (-RT or -LT), and a missing one is a top denial trigger.

Pabau’s claims management software checks eligibility and validates required fields before a 73090 claim goes to Claim.MD.

CPT code 73090: Official descriptor and anatomical scope

CPT code 73090 describes “Radiologic examination; forearm, 2 views” as published by the American Medical Association. The forearm, for coding purposes, means the segment between the wrist joint and the elbow joint, comprising the radius and the ulna. The code captures both bones in a single study. It is intended for the forearm shaft, and the elbow (73080) and wrist (73100/73110) have their own codes.

Two views is the minimum, and most practices capture AP and lateral projections as the standard pair. Additional views (oblique, stress) in the same encounter still bill as 73090. The code does not increment beyond the two-view floor.

CPT 73090 code details at a glance

The table below pulls together the quick-reference data coders need before building a claim. Medicare payment figures change each January with the CMS Physician Fee Schedule, so verify current rates against the live lookup before billing.

Procedure description and clinical indications

A forearm X-ray under CPT 73090 captures the full length of the radius and ulna in at least two planes. The standard acquisition is an AP (anteroposterior) and a lateral, with the patient’s arm extended and supinated for the AP view. Clinicians order forearm radiography when they need to visualize the diaphysis of both long bones, not the joint surfaces themselves.

Common clinical indications that support medical necessity include:

• Fracture evaluation: both-bone forearm fractures, isolated radius fractures, and isolated ulna (nightstick) fractures
• Post-reduction or post-operative imaging: confirming alignment after fracture management
• Suspected osteomyelitis or periosteal reaction: infection or inflammatory changes along the shaft
• Deformity assessment: congenital or acquired bowing, Madelung deformity
• Foreign body localization: radiopaque objects embedded in the forearm soft tissue
• Stress fracture workup: particularly in athletes with forearm pain and equivocal clinical findings
• Tumor or lesion surveillance: cortical lesions, enchondromas, fibrous dysplasia

Medical necessity documentation must specify the clinical indication in the order. Payers applying Local Coverage Determination (LCD) criteria look for a diagnosis that maps directly to the forearm. A wrist or elbow diagnosis points them to an adjacent code instead of 73090.

How to bill CPT code 73090: Modifiers and billing scenarios

Modifier selection is driven by where the service is performed and how the work is split between the facility and the interpreting physician. Getting this wrong generates the most common 73090 denials.

Modifier -RT (right side) and -LT (left side) are required by most commercial payers and many Medicare Administrative Contractors even when the study is unilateral. The radiology order should document laterality explicitly so the modifier matches the report.

ICD-10 codes commonly paired with CPT 73090

The diagnosis code you attach to 73090 must establish that the forearm, specifically, needed imaging. A wrist pain code such as M25.531 or M25.532 (pain in right or left wrist) on a forearm X-ray often draws a medical necessity denial. The diagnosis points to a different anatomical segment.

Use the most specific ICD-10 code available, including laterality. An “unspecified” code is acceptable only when laterality is genuinely unknown at the time of the order, which is rare for forearm injuries.

CPT 73090 vs adjacent forearm and extremity X-ray codes

The upper extremity radiology family is the most error-prone segment for anatomical miscoding. The most common mistake is billing 73080 (elbow) when the documentation describes a forearm shaft injury. The mirror error is billing 73090 when the order references the wrist. The table below isolates the key differentiators for the six codes most often confused with CPT code 73090.

The decisive factor is where the radiograph is centered. If the beam centres on the mid-shaft of the radius and ulna, use 73090. If the clinical order says “elbow” or the imaging report documents joint-space evaluation, use 73080. A study centered on the wrist joint takes 73100 for two views or 73110 for three or more.

The guide below lines up each upper extremity code from shoulder to finger, so the segment in the order points straight to the code.

Can CPT code 73090 be billed with other codes?

Same-day billing of adjacent extremity codes is the second most common source of 73090 claim edits. The CMS National Correct Coding Initiative (NCCI) publishes bundling edit tables quarterly. Specific edit pairs can change, so verify current edits before filing.

General bundling rules for CPT 73090:

• 73090 + 73080 (elbow) on the same encounter: NCCI edits commonly bundle these when the clinical documentation does not clearly justify both studies. Document separate clinical indications for each anatomical region.
• 73090 + 73100/73110 (wrist) on the same encounter: Billable when the clinical notes support separate medical necessity for the forearm study and the wrist study. Both require distinct ICD-10 diagnosis codes.
• Bilateral forearm studies: Use modifier -50 for a single-line bilateral claim, or two separate line items with -RT and -LT. Payer rules differ — check the payer’s bilateral policy before submitting.
• Fracture care codes (e.g. 25600-25609): Some payers treat post-reduction imaging under 73090 as inclusive when the fracture care code already includes a radiology component. Confirm via the payer’s LCD.

Prior authorization requirements for CPT 73090

Prior authorization (PA) requirements for forearm X-rays vary by payer and plan. Medicare does not require PA for 73090 under current policy, but Medicaid managed care plans and commercial insurers differ significantly.

• Medicare: Generally no prior authorization required for diagnostic radiography. Emergency situations waive PA requirements across payers.
• Medicaid managed care: PA requirements vary by state and plan. Many plans waive PA for acute trauma presentations (fracture, suspected fracture).
• Commercial payers: Some plans require PA for all diagnostic imaging, regardless of clinical urgency. Others use step-therapy policies that require a clinical history of conservative management first.
• Documentation to support LCD review: Include the referring physician’s order, clinical indication, laterality, and history such as injury mechanism and symptom duration.

Check the payer’s portal or call provider services before scheduling non-urgent forearm imaging when PA status is uncertain. Submitting without a required PA usually ends in a denial, and an appeal alone rarely recovers it. A written prior authorization process catches these cases at scheduling, before the study is done.

Common CPT 73090 claim denial reasons and how to fix them

Most 73090 denials fall into six categories, and each has a direct corrective action. The payer’s denial reason codes tell you which category a claim landed in. A steady denial management process then stops the same error recurring across radiology claims.

Documentation requirements for CPT 73090

A 73090 claim that survives payer audit contains the following elements in the patient’s record and the radiology report.

• Physician order: written or electronic order from the referring provider stating the clinical indication and laterality
• Clinical indication: symptom description or provisional diagnosis that maps to the forearm (not the wrist or elbow)
• View count: the radiology report must state the number and type of views obtained (minimum 2)
• Laterality documentation: the report and the order must agree on which arm was imaged
• Interpreting physician signature: the final read report must be signed or authenticated by the interpreting radiologist
• Date of service: the imaging date on the claim must match the report date

Medicare’s Conditions of Participation require a physician order for all diagnostic imaging services. Payers performing post-payment audits will request the order alongside the radiology report. Missing either element is grounds for recoupment.

Medicare reimbursement rate for CPT code 73090

Medicare reimbursement for CPT 73090 is calculated from the Relative Value Unit (RVU) methodology under the CMS Physician Fee Schedule. The national rate is then adjusted by the geographic practice cost index (GPCI) for your locality, so payment varies by ZIP code.

Approximate national averages are below as a reference point. In a facility setting, Medicare pays the physician the professional component only. Verify the current year’s exact figures via the CMS PFS search tool.

These figures are estimates based on typical RVU weights and the 2025-2026 conversion factor. CMS updates the conversion factor annually. Use the CMS PFS lookup tool with your MAC locality code to retrieve the exact payment amount for your practice location.

How claims management software reduces errors on 73090 claims

Three errors drive most 73090 denials: the wrong anatomical code, a missing laterality modifier, and an ICD-10 code the payer won’t accept. Picking the right code is still the coder’s job. Claims software helps catch missing details before submission, so fewer claims come back for avoidable reasons.

Pabau, the practice management platform we build, includes claims software for practices that bill insurance. For a 73090 claim, it covers four steps.

• Electronic submission through Claim.MD: claims go to the clearinghouse from the patient record, so nobody re-keys a 73090 line into a separate portal.
• Real-time eligibility checks: coverage is confirmed before the visit, so a lapsed plan shows up before the X-ray rather than after the denial.
• Pre-submission validation: required claim fields are checked before the claim leaves, so your team fixes an incomplete claim in-house instead of waiting on a rejection.
• Claim status tracking: each submitted claim shows where it sits, so stalled 73090 claims get followed up without a call to the payer.

Because the order, the radiology report and the claim sit on one patient record, laterality and diagnosis are easy to check against each other. If your team is newer to insurance claims, our guide to medical billing workflows covers each step from encounter to payment.

Send cleaner forearm X-ray claims

Pabau submits 73090 claims through Claim.MD, with eligibility checks and required-field validation before each one goes out. See how it works in a live demo.

Book a demo

Conclusion

Treat the order as the source of truth for every 73090 claim. When it names the forearm, states the side and gives a forearm diagnosis, the code, modifier and ICD-10 pairing follow from it.

The trade-off is a few extra seconds at order entry. That costs far less than reworking a denied claim that pays only $22 to $35 globally in the first place.

Pabau’s claims management software submits claims electronically through Claim.MD, with eligibility checks and validation before each submission. Book a demo to see how it fits your radiology billing workflow.

Continue your research

Need a clean claim checklist for radiology? Clean claim requirements in medical billing covers the nine elements every radiology claim needs to avoid front-end edits.

How does electronic remittance work after a 73090 payment? Electronic remittance advice (ERA) explained walks through how 835 ERA files map denial reason codes back to specific claim lines.

Want to understand the clearinghouse between your system and the payer? Medical claims clearinghouse guide explains what a clearinghouse does, what the 837P file contains, and how edits catch errors before the claim reaches the insurer.

Frequently asked questions