CPT code 11621: Excision of malignant lesion, scalp, neck, hands, feet
CPT code 11621 covers malignant lesion excision of 0.6 to 1.0 cm on the scalp, n...
Last Updated: July 31, 2026
Key takeaways
CPT Code 15845 describes a graft for facial nerve paralysis using regional muscle transfer, classified under the Integumentary System in the CPT codebook.
Pair this code with ICD-10 diagnosis codes such as G51.0 (Bell’s palsy) or other G51.x codes. A mismatched or missing diagnosis code is the leading denial trigger for this procedure.
Modifiers -22, -51, and -80 may apply depending on procedure complexity and surgical team. Verify applicability against current AMA CPT guidelines before every submission.
Pabau’s claims management software helps plastic surgery and reconstructive practices submit CPT 15845 claims with correct modifiers, linked diagnosis codes, and a full audit trail.
CPT Code 15845 is the AMA CPT descriptor for a graft for facial nerve paralysis using regional muscle transfer. Surgeons bill it when they reroute an adjacent muscle, such as the temporalis, to restore movement to a paralyzed face.
Getting the claim right takes more than the procedure code. Modifiers, the ICD-10 crosswalk, facility vs. non-facility rates, and CCI bundling rules all have to align. Missing any one of them can trigger a denial or a post-payment audit.
This reference guide covers the official descriptor, procedure details, applicable modifiers, and Medicare reimbursement rates. It also covers the ICD-10 diagnosis code crosswalk, CCI bundling edits, related codes in the facial nerve paralysis family, and documentation requirements for accurate billing.
CPT Code 15845: Definition and clinical description
CPT Code 15845 carries the official AMA CPT descriptor: Graft for facial nerve paralysis; regional muscle transfer. The code sits within the Integumentary System section of the CPT codebook, specifically under “Other Repair (Closure) Procedures on the Integumentary System.”
Coders working across plastic surgery EMR platforms will encounter this code when a surgeon transfers an adjacent, functioning muscle. The muscle restores movement and symmetry to a paralyzed face.
The key distinction in the descriptor is regional muscle transfer. The donor muscle remains attached to its original blood supply and nerve, then is repositioned to animate the paralyzed face.
This is a technically distinct approach from a free muscle transfer, which harvests a muscle from a distant site with microvascular reattachment.
Procedure description: Regional muscle transfer for facial nerve paralysis
Facial nerve paralysis, also documented as facial palsy or facial paresis (ICD-10: G51.x), causes unilateral loss of facial muscle function. Patients lose the ability to close the eye, smile, or show expression on the affected side. When nerve repair is not feasible, regional muscle transfer is a common reconstructive option.
In the regional transfer technique, the surgeon mobilizes a nearby muscle, typically the temporalis or masseter. The muscle is rerouted to simulate the action of the paralyzed mimetic muscles. Because the muscle keeps its blood and nerve supply, it can be reinnervated or trained to contract in a coordinated way.
The approach is distinct from free muscle graft (CPT 15842), where a distant muscle, often the gracilis, is harvested and requires microvascular anastomosis.
- Donor muscle: typically temporalis or masseter (regional, pedicled)
- Blood supply: preserved (not divided and reattached)
- Procedure setting: hospital operating room or ambulatory surgical center
- Recovery: multi-week, with physical therapy to retrain the muscle
- Specialty: performed by facial plastic surgeons, reconstructive surgeons, or neurotologists
Accurate coding for plastic surgery billing workflows requires the operative note to confirm which muscle was transferred and the surgical technique used. It also requires the documented diagnosis of facial nerve paralysis. Missing any of these elements gives payers grounds to deny the claim.
CPT Code 15845 vs CPT Code 15842: Key differences
The most common coding error in this procedure family is confusing CPT Code 15845 with CPT 15842. Both codes cover facial nerve paralysis grafting, but the technique determines the correct code.
The operative note is the determining document. If the surgeon harvested a temporalis or masseter muscle and rerouted it without dividing the blood supply, report CPT Code 15845. If a gracilis or other distant free muscle was harvested with microvascular reattachment, report CPT 15842 instead.
Applicable modifiers for CPT 15845
Modifier selection for CPT Code 15845 depends on the clinical circumstances of the encounter. According to current AMA CPT coding resources, the modifiers most commonly encountered with surgical integumentary codes include the following.
Always verify applicability against the current AMA CPT guidelines before submission, as incorrect modifier use is a frequent audit trigger.
Modifier -22 requires a written report explaining the increased complexity. Without detailed documentation in the operative note, payers routinely reject -22 claims. Modifier -51 is typically appended to the secondary code, not to 15845 itself, when multiple procedures are performed. Check individual payer policies before using modifier -51 with Medicare, as some payers process multiple-procedure reductions automatically.
Pro Tip
Document every modifier decision in the operative note before submitting the claim. For modifier -22, include a separate written report describing the specific circumstances that increased procedural complexity. Payers pull records on high-complexity modifier submissions, and insufficient documentation is the primary reason for -22 denials on CPT Code 15845 claims.
Reimbursement rates for CPT Code 15845
Medicare reimbursement for CPT Code 15845 varies by place of service and geographic locality. Use the CMS Physician Fee Schedule (MPFS) lookup tool to obtain current rates for your specific MAC jurisdiction.
The rates below are indicative ranges based on 2026 MPFS data. Actual payments depend on the locality-adjusted conversion factor, work RVUs, practice expense RVUs, and malpractice RVUs assigned to this code.
Confirm rates every year using the CMS Physician Fee Schedule lookup tool, since MPFS updates change the locality-adjusted conversion factor annually. Avoid referencing prior-year figures in claim submissions or pre-authorization requests.
Medicare coverage and payer considerations
Medicare covers CPT Code 15845 when the claim is supported by a documented diagnosis of facial nerve paralysis and the procedure is medically necessary. Prior authorization requirements vary by Medicare Advantage plan and commercial payer. Coverage criteria for facial nerve paralysis grafting may reference local or national coverage determinations (LCDs / NCDs). Billing teams should consult the relevant MAC’s LCD before submission.
- Confirm the payer’s prior authorization requirements before scheduling
- Obtain operative notes that explicitly state the diagnosis, the donor muscle used, and the transfer technique
- For commercial payers, review Aetna, BCBS, and UHC clinical policy bulletins for coverage criteria
- Medicare Advantage plans may have stricter requirements than traditional Medicare
ICD-10 diagnosis codes used with CPT 15845
A diagnosis code confirming facial nerve paralysis must accompany every CPT Code 15845 claim. The following ICD-10-CM codes are commonly linked with this procedure. Verify crosswalk accuracy against current CDC/NCHS ICD-10-CM guidance and ensure the selected code matches the clinical documentation precisely.
The diagnosis code must reflect the etiology documented by the treating physician, not a generic catchall. Using G51.9 (unspecified) when the clinical record confirms Bell’s palsy (G51.0) is a specificity error that payers flag. Specificity matters for medical billing compliance across all specialties.
Bundling rules and CCI edits for CPT 15845
The National Correct Coding Initiative (NCCI) publishes CCI edits that govern which codes can and cannot be billed together. NCCI edits are updated quarterly, so the pairs listed here represent the structural categories most relevant to CPT Code 15845 based on current policy guidance.
Always run claims against the current NCCI tables before submission. Practices managing claims management workflows should integrate real-time CCI edit checks into their billing process.
- Surgical approach codes: Incision and closure codes integral to the primary procedure are typically bundled and cannot be billed separately alongside CPT 15845.
- Anesthesia: Anesthesia codes are never reported by the operating surgeon on the same claim as the surgical code.
- Component procedures: Preparatory steps, such as simple wound preparation or basic skin closure, are part of the transfer technique. Bundle them into 15845 rather than listing them as separate line items.
- Override modifier: Modifier -59 (Distinct Procedural Service) may be appended to a bundled code when the clinical circumstances genuinely justify separate billing. Payers require supporting documentation.
Because NCCI edits change quarterly, verify the current edit version at the time of claim submission. Billing teams at reconstructive surgery clinics should schedule a quarterly review of CCI tables for all high-value procedure codes, including CPT 15845.
Documentation requirements and coding tips
Facial reanimation surgery coding rises or falls on the operative note. Reviewers look for specific elements: a claim submitted without them is a denial waiting to happen.
- Confirmed diagnosis: The operative note must state the diagnosis and etiology, such as idiopathic Bell’s palsy or traumatic nerve injury.
- Technique documentation: Specify that a regional muscle was transferred, name the donor muscle (e.g., temporalis), and describe how it was repositioned and secured.
- Medical necessity statement: Include a brief statement explaining why muscle transfer was chosen over other options (nerve grafting, watchful waiting).
- Laterality: Document which side of the face was operated on; use RT/LT modifiers and confirm laterality in the operative report.
- Procedure duration and complexity: If using modifier -22, provide specific notes on the circumstances that increased operative time or complexity beyond the typical case.
Coders working with plastic surgery billing software should create a documentation checklist specific to CPT Code 15845 that surgeons complete before the claim is submitted. A pre-submission checklist catches the most common denial triggers at the point of care rather than during a post-payment audit.
Related CPT codes in the facial nerve paralysis family
CPT codes 15840 through 15845 form the facial nerve paralysis graft family within the Integumentary System. Use the table below to select the correct code based on the procedure performed. Browse the full range using the AAPC Codify CPT lookup.
Codes 15840 and 15841 involve tissue grafts rather than whole-muscle transfers. The distinction between 15842 and 15845 is entirely about the muscle origin and whether microvascular anastomosis was performed.
Review the operative note before selecting any code in this family. Practices managing multiple CPT code families across specialties benefit from specialty-specific coding references built into their billing workflow.
How Pabau simplifies CPT 15845 billing and documentation
Surgical procedure codes like CPT Code 15845 involve multiple moving parts: modifier selection, diagnosis crosswalk, CCI edit compliance, and facility vs. non-facility rate calculations. Manual processes leave room for a missed step at any one of those points, and each miss risks a denial.
Claims management software built for procedure-intensive specialties embeds these checks directly into the claim workflow.
Pabau’s plastic surgery EMR and practice management platform integrates CPT billing, claim submission, and audit trail tracking. When a coder links CPT Code 15845 to the claim, the system prompts for a matching diagnosis code and flags missing modifiers. It also logs every change to the claim record.
This creates the documentation trail that payers require when reviewing complex surgical submissions.
For practices that want to tighten their CPT billing process, the following steps reduce denial rates on high-complexity procedure codes:
- Build a pre-submission checklist for each CPT code family your practice bills regularly, including CPT 15845
- Configure your billing system to require a G51.x or equivalent diagnosis code when CPT 15845 is entered
- Set a quarterly calendar reminder to review NCCI CCI edit updates that affect your procedure code set
- Audit denied claims monthly to identify modifier patterns that trigger payer-specific rejections
- Link operative note templates to specific CPT codes so surgeons capture required documentation at the point of care
Practices running practice management across multiple surgeons or locations benefit most from automated checks. These catch errors before claims leave the practice, rather than after the payer issues a denial.
Simplify CPT billing for surgical and reconstructive practices
Pabau's claims management tools help your team link diagnosis codes and apply the right modifiers to codes like CPT 15845. Track claim status for every submission from one platform.
Pro Tip
Run a quarterly audit of your CPT 15845 claims. Pull all submissions from the past 90 days, filter for denials, and categorize them by denial reason code. Most practices find that 70-80% of denials cluster around two or three fixable causes, such as missing modifier documentation or ICD-10 code specificity errors. Fix the root cause once and prevent the same denial pattern from recurring.
Conclusion
Getting CPT Code 15845 right comes down to the operative note, not the code selection. A well-documented regional muscle transfer, clearly distinguished from a free muscle flap or fascia graft, clears most payer reviews on the first submission. The practices with the fewest denials build modifier and diagnosis checks into the workflow before the claim goes out. They fix errors before submission, not after a rejection lands.
Pabau’s HIPAA-compliant practice management platform builds these checks into the daily billing workflow for surgical and reconstructive practices. Book a demo to see how Pabau handles procedure code billing for complex surgical specialties.
Continue your research
Coding a facial autograft instead of a muscle transfer? CPT Code 15135 covers dermal autografts to the face and scalp, a related facial reconstruction code.
Billing a related body-contouring procedure? CPT Code 15830 walks through panniculectomy billing, another high-complexity integumentary procedure.
Need the coding rules for eyelid reconstruction? CPT Code 15821 covers lower eyelid blepharoplasty billing for reconstructive and cosmetic cases.
Billing a skin substitute graft add-on? CPT Code 15276 explains the add-on rules for skin substitute grafts used in reconstructive wound care.
Frequently asked questions
What is CPT Code 15845 used for?
CPT Code 15845 is used to report a graft for facial nerve paralysis via regional muscle transfer. An adjacent muscle, such as the temporalis, is rerouted to restore facial movement while keeping its blood supply intact. It is reported by the operating surgeon for reconstructive procedures addressing facial palsy from Bell’s palsy, traumatic nerve injury, or post-surgical paralysis.
What is the reimbursement rate for CPT 15845?
Medicare reimbursement for CPT 15845 varies by geographic locality and place of service. Facility rates (hospital or ASC) are lower for the physician component, as the facility bills separately. Always confirm the current rate using the CMS Physician Fee Schedule lookup tool, as MPFS rates change annually.
What modifiers apply to CPT Code 15845?
Modifiers -22 (Increased Procedural Services), -51 (Multiple Procedures), -59 (Distinct Procedural Service), and -80 (Assistant Surgeon) are the modifiers most commonly applicable to CPT 15845. Modifier -22 requires a written report detailing the increased complexity. Always verify modifier applicability against the current AMA CPT guidelines and individual payer policies before submission.
What ICD-10 codes are used with CPT 15845?
The most common ICD-10-CM codes paired with CPT 15845 are G51.0 (Bell’s palsy), G51.8 (other facial nerve disorders), and G51.9 (unspecified). Use the most specific code supported by clinical documentation; G51.0 is preferred over G51.9 when the diagnosis is Bell’s palsy. Verify the crosswalk against current CDC/NCHS ICD-10-CM guidance.
How does CPT 15845 differ from CPT 15842?
CPT 15845 reports a regional (pedicled) muscle transfer where the donor muscle’s blood supply is preserved throughout the procedure, typically using the temporalis or masseter. CPT 15842 reports a free muscle flap using microsurgical technique, where a distant muscle is harvested and reattached via microvascular anastomosis. The operative note determines the correct code: if microvascular reattachment was performed, use 15842; if the muscle was simply rerouted, use 15845.
What are the bundling rules for CPT 15845?
NCCI CCI edits bundle codes for integral components of the regional muscle transfer, such as basic wound closure and incision codes, into CPT 15845. These cannot be billed separately. CCI edits are updated quarterly, so billing teams should verify the current NCCI version before submission. Modifier -59 may permit separate billing of a bundled service when clinical circumstances genuinely justify it, with supporting documentation required.
