CPT 23491Surgery

Reinforce shoulder bones

CPT code 23491 covers surgical procedures to reinforce shoulder bones, typically using bone grafts or synthetic materials to strengthen weakened or damaged bone structures in the shoulder joint.

Showing rates for

National Average

Base Medicare rate

$1,002.42

This calculator gives a typical-case estimate using standard Medicare modifier rules. Actual payment depends on payer policies, documentation, code-specific CMS status indicators, and locality. Verify before billing.

RVU breakdown

Work RVU

14.54

PE RVU (NF)

13.47

MP RVU

2.98

Total RVU

30.99

Conversion factor: 32.3465 · Source: CMS MPFS RVU25A · Confidence: High

NCCI bundling edits

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Billing tips

Document medical necessity with imaging studies showing cortical destruction >50% or Mirels score ≥8 for impending pathological fracture
Impact: Prevents medical necessity denials which account for 35-40% of initial claim rejections for this code; saves average $1002.42 per prevented denial
Always verify pre-authorization requirements as most payers classify 23491 as requiring prior approval due to prophylactic nature
Impact: Lack of pre-authorization is the leading cause of denial, affecting 45% of claims; obtaining authorization prevents 100% payment denial
Bill in facility setting when performed as inpatient or hospital outpatient to capture appropriate facility fees; physician still receives $1002.42 regardless of setting
Impact: Ensures facility receives separate technical component payment; no impact on physician professional fee but critical for facility revenue cycle
Append modifier 22 with detailed operative note when bone reinforcement requires custom implant fabrication, extensive curettage, or grafting beyond routine
Impact: Successfully supported modifier 22 claims increase reimbursement by $200-$500; requires documentation of time exceeding 90 minutes and specific complexity factors
Use ICD-10 codes specifying neoplasm site, laterality, and malignant vs benign nature; link to codes demonstrating impending fracture risk such as M84.5x1-M84.5x9
Impact: Precise diagnosis coding reduces medical review requests by 60% and accelerates clean claim processing by 8-12 days
Submit operative report with claim for first-time billing to expedite review; include details on materials used (allograft, autograft, PMMA cement, plate/screw construct)

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 23491 in 2025?

Medicare pays $1002.42 for CPT 23491 in 2025 based on the national average rate. This applies to both facility and non-facility settings, with the same rate of $1002.42 for the professional component.

What is the total RVU value for CPT 23491?

CPT 23491 has a total RVU of 30.99 for 2025, consisting of 14.54 work RVUs, 13.47 practice expense RVUs, and 2.98 malpractice RVUs. This high RVU value reflects the complexity and risk of prophylactic shoulder bone reinforcement.

Does CPT 23491 require prior authorization from insurance?

Most commercial payers and Medicare Advantage plans require prior authorization for CPT 23491 due to its prophylactic nature and high cost. Traditional Medicare does not require prior authorization but claims are subject to medical necessity review. Verify specific payer requirements before scheduling.

What diagnosis codes support medical necessity for CPT 23491?

Common supporting diagnosis codes include C79.51 (secondary malignant neoplasm of bone), M85.50-M85.59 (aneurysmal bone cyst), M85.60-M85.69 (other cyst of bone), and M84.50-M84.59 (pathological fracture in neoplastic disease). The diagnosis must demonstrate impending fracture risk in the shoulder region.

Can CPT 23491 be billed bilaterally with modifier 50?

Yes, CPT 23491 can be billed with modifier 50 for bilateral procedures when both shoulders require prophylactic reinforcement in the same operative session. This is uncommon but may occur in patients with bilateral metastatic disease. Bilateral billing typically reimburses at 150% of the unilateral rate.

What modifiers are required when billing CPT 23491?

Laterality modifiers LT (left) or RT (right) are mandatory for CPT 23491. Additional modifiers may include 22 (increased procedural services), 59 (distinct procedural service), 78 (return to OR), or AS (assistant surgeon) depending on specific circumstances of the procedure.

How does CPT 23491 differ from shoulder fracture treatment codes?

CPT 23491 is specifically for prophylactic reinforcement performed before fracture occurs in weakened bone. Fracture treatment codes (23505-23680 series) are used when an actual fracture is present. Using 23491 when a fracture already exists will result in denial and require recoding to the appropriate fracture treatment code.