CPT 21685Surgery

Hyoid myotomy & suspension

CPT 21685 covers a surgical procedure where the surgeon cuts and repositions muscles attached to the hyoid bone (a small bone in the neck) and suspends it in a new position. This is typically performed to treat severe obstructive sleep apnea or swallowing disorders by opening the airway.

Showing rates for

National Average

Base Medicare rate

$958.43

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

15.26

PE RVU (NF)

12.16

MP RVU

2.21

Total RVU

29.63

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

NCCI bundling edits

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Billing tips

Document all concurrent multilevel airway procedures separately with appropriate sequencing. Bill 21685 as primary if it has the highest RVU value among procedures performed.
Impact: Proper sequencing can preserve $400-600 in reimbursement by ensuring the highest-value procedure receives 100% payment
Always verify that the operative report explicitly documents both the myotomy (cutting of muscles) and the suspension (fixation to new position) components. Missing documentation of either component may trigger downcoding.
Impact: Complete documentation prevents downcoding to evaluation codes or denials, protecting the full $958.43 reimbursement
For sleep apnea indications, ensure preoperative documentation includes failed conservative therapy (CPAP trial), sleep study results with AHI scores, and anatomic assessment (Friedman staging or sleep endoscopy findings).
Impact: Robust medical necessity documentation reduces denial risk by 60-70% and supports appeal success rates above 85%
When billing with genioglossus advancement (21199) or UPPP (42145), verify payer-specific bundling rules. Some commercial payers recognize multilevel airway surgery as distinct procedures while Medicare may have bundling edits.
Impact: Unbundling when appropriate can add $800-1,500 to total case reimbursement; incorrect unbundling triggers audits
Use modifier 22 only when operative time exceeds typical duration by 30% or more and operative report details specific anatomic challenges, adhesions from prior surgery, or unexpected complications requiring additional work.
Impact: Properly documented modifier 22 claims can yield additional $190-290, but unsupported claims face 90% denial rates

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Frequently asked questions

What is the Medicare reimbursement rate for CPT code 21685 in 2025?

The 2025 Medicare national average reimbursement for CPT 21685 is $958.43 for both facility and non-facility settings. This is based on 29.63 total RVUs (15.26 work RVU, 12.16 PE RVU, 2.21 MP RVU) multiplied by the 2025 conversion factor of 32.3465.

Can CPT 21685 be billed with UPPP or other sleep apnea surgery codes?

Yes, CPT 21685 can be billed with UPPP (42145) and other airway procedures when performed during the same operative session, as they address different anatomic levels of obstruction. Use modifier 51 on the secondary procedure(s), and ensure the operative report clearly documents separate surgical sites and distinct objectives. However, verify payer-specific bundling rules as some insurers may have restrictions on multilevel airway procedure combinations.

What documentation is required to support medical necessity for hyoid myotomy and suspension?

Required documentation includes: polysomnography showing moderate to severe OSA (typically AHI >15), evidence of failed conservative therapy (CPAP trial with compliance data), physical examination with airway assessment, diagnostic imaging or sleep endoscopy demonstrating hypopharyngeal or base-of-tongue obstruction, and consultation notes explaining why this specific procedure is indicated for the patient's anatomy and obstruction pattern.

Which medical specialties typically perform and bill CPT code 21685?

CPT 21685 is primarily performed by otolaryngologists (ENT surgeons) with specialized training in sleep surgery, and oral and maxillofacial surgeons. The procedure requires board certification or eligibility in the respective specialty, and the operating surgeon must be the billing provider as this cannot be billed under supervision.

What is the global period for CPT 21685?

CPT 21685 has a 90-day global surgical period. All routine postoperative care within 90 days of the procedure is included in the reimbursement. Any complications requiring return to the operating room should be billed with appropriate modifiers (78 for related procedures, 79 for unrelated procedures) and will receive adjusted payment.

How does hyoid suspension differ from other sleep apnea surgery codes?

Hyoid suspension (21685) specifically addresses hypopharyngeal and retroglossal obstruction by repositioning the hyoid bone, whereas UPPP (42145) addresses palatal obstruction, genioglossus advancement (21199) addresses base-of-tongue obstruction via mandibular approach, and tongue base radiofrequency (41530) uses tissue reduction rather than skeletal repositioning. The anatomic target and surgical technique are distinct, supporting separate billing when multiple levels are addressed.

What are common reasons for denial of CPT 21685 claims?

The most common denial reasons include: inadequate documentation of CPAP failure or conservative treatment attempts, lack of objective sleep study data supporting severity, payer policies deeming the procedure experimental or investigational, inappropriate bundling with concurrent procedures, and incomplete operative reports that don't clearly document both the myotomy and suspension components of the procedure.