X-ray exam of ankle
CPT code 73610 covers a basic X-ray examination of the ankle, typically involving 2-3 views to evaluate bones and joints for injuries, arthritis, or other abnormalities.
RVU breakdown
Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High
Billing tips
Always specify laterality (RT/LT modifiers) even though not required by Medicare - many commercial payers will deny without it
Impact: Prevents automatic denials and reduces claim rework time by 3-5 days per claim
Document the number of views taken (minimum 2 for complete exam) - if fewer than 2 views, code 73600 (limited study) should be used instead
Impact: Using 73610 for single view risks $10-15 overpayment recoupment per claim during audits
Bill globally (no modifier) when performing in office setting with owned equipment - don't split components unnecessarily
Impact: Maximizes reimbursement at full $35.26 versus reduced component payments
For bilateral ankle X-rays, bill 73610 twice with RT and LT modifiers (or modifier 50 per payer preference) rather than doubling units
Impact: Bilateral reimbursement typically 150% of unilateral rate ($52.89 total) when billed correctly
Link appropriate ICD-10 diagnosis codes that support medical necessity - ankle pain (M25.57-) or injury codes (S93.4-) are most common
Impact: Prevents medical necessity denials which represent 15-20% of all 73610 claim denials
For post-reduction or post-operative films same day, use modifier 76 and document clinical necessity in interpretation report
Impact: Ensures payment for medically necessary repeat studies; without modifier 76, second study will deny as duplicate
Common denials
Medical necessity not established - vague diagnosis like 'ankle pain' without additional clinical context
How to appeal: Provide documentation of physical examination findings, mechanism of injury, Ottawa ankle rules assessment, or failed conservative treatment. Include physician notes supporting need for imaging per ACR Appropriateness Criteria.
Duplicate service - same code billed multiple times same day without appropriate modifiers
How to appeal: Submit operative/procedure notes demonstrating separate encounters or use of modifier 76 for repeat procedures. Document clinical necessity for repeat imaging (post-reduction, evaluation of treatment, new injury).
Insufficient documentation - radiology report does not specify number of views or anatomic structures evaluated
How to appeal: Provide complete radiology report listing each view obtained (AP, lateral, mortise, etc.) and complete interpretation. Ensure report is signed and dated by interpreting physician.
Missing or incorrect laterality modifier required by commercial payers
How to appeal: Resubmit claim with appropriate RT or LT modifier. Include statement that laterality was documented in original order and report. Most payers accept corrected claims without requiring full appeal process.
Frequently asked questions
What is the Medicare reimbursement rate for CPT 73610 in 2025?
Medicare pays $35.26 for CPT code 73610 (X-ray exam of ankle) in 2025 based on the national average non-facility rate. Both facility and non-facility rates are identical at $35.26. The code has a total RVU value of 1.09.
How many X-ray views are required to bill CPT 73610?
CPT 73610 requires a minimum of two views for a complete ankle X-ray examination. Common views include anteroposterior (AP), lateral, and mortise views. If only one view is obtained, code 73600 (limited ankle X-ray) should be used instead.
What is the difference between CPT 73610 and 73600?
CPT 73610 is a complete ankle X-ray examination with 2 or more views, while 73600 is a limited study with 1 view. Code 73610 reimburses at $35.26 compared to a lower rate for 73600. The number of views documented determines which code to use.
Do I need to use laterality modifiers RT or LT with CPT 73610?
Medicare does not require laterality modifiers for 73610, but many commercial payers do require RT (right) or LT (left) modifiers for claim processing. Best practice is to always include laterality modifiers to prevent denials and facilitate faster payment across all payers.
Can CPT 73610 be billed bilaterally for both ankles?
Yes, for bilateral ankle X-rays, bill CPT 73610 twice with RT and LT modifiers, or use modifier 50 (bilateral procedure) per payer requirements. Bilateral reimbursement is typically 150% of the unilateral rate, not 200%, resulting in approximately $52.89 total payment.
When should I use modifier 26 or TC with CPT 73610?
Use modifier 26 for the professional component (physician interpretation only) when you don't own the equipment. Use modifier TC for the technical component (equipment and technologist) when not providing interpretation. Bill globally without modifiers when providing both components in your facility.
What ICD-10 codes support medical necessity for CPT 73610?
Common supporting diagnoses include ankle pain (M25.571-M25.579), ankle sprain (S93.4-), ankle fracture (S82.-, S92.-), ankle arthritis (M19.07-), and ankle instability (M25.37-). Documentation should link the diagnosis to clinical findings justifying the X-ray examination.