Impression and custom preparation of a custom auricular (ear) prosthesis to replace a partially or totally absent external ear.
Verified May 8, 2026 · 7 sources ↓
- Medicare
- $1,627.29
- Total RVUs
- 48.72
- Global, days
- 90
- Region
- Other
Documentation requirements
What must appear in the operative or office note to support the claim.
Source · Editorial brief grounded in 7 cited references ↓
- Diagnosis supporting auricular absence — congenital, post-traumatic, or post-surgical — with ICD-10 code linked to the claim
- Physician order or prescription specifying a custom auricular prosthesis as medically necessary
- Operative or clinical note confirming impression was taken and custom fabrication was performed
- Photographs or measurements documenting the defect and contralateral ear used as the symmetry reference
- Prior authorization approval number when required by payer — attach to claim or retain in file
- Documentation of prosthesis attachment method (adhesive, implant-retained, or combination) to support medical necessity narrative
Applicable modifiers
Modifiers commonly billed with this code.
Source · AMA CPT modifier descriptors · CMS NCCI Policy Manual
What this code covers
Source · Editorial summary grounded in 7 cited references ↓
CPT 21086 covers the full workflow of fabricating a custom silicone auricular prosthesis: taking an impression of the affected ear area and the contralateral ear for symmetry, constructing a prototype for fit verification, and completing a medical-grade silicone device matched to the patient's skin tone and texture. The code lives within the maxillofacial prosthetics family (21076–21088) and covers the impression plus the custom preparation as a single billable service. It is not a surgical implant code — osseointegrated implant placement is reported separately.
The 90-day global period means all routine follow-up related to prosthesis adjustment and care is bundled from the day of service through day 90. Unrelated visits in that window require modifier 24. The wide HOPD-vs-ASC payment gap (see site-of-service table) makes setting selection a meaningful revenue consideration.
Medical necessity documentation is the principal coverage hurdle. Most payers require evidence that ear absence stems from surgery, trauma, or a congenital condition, along with physician orders and prior authorization. Wisconsin ForwardHealth and comparable Medicaid programs list 21086 as an allowable code requiring a PA request.
RVU & reimbursement
Component RVUs and Medicare national rate. Actual payment varies by GPCI locality.
Source · CMS Physician Fee Schedule, RVU26A · January 2026
| Work RVU | 24.26 |
| Practice expense RVU | 21.7 |
| Malpractice RVU | 2.76 |
| Total RVU | 48.72 |
| Medicare national rate | $1,627.29 |
| Global period | 90 days |
Payment by site of service
Medicare pays different rates by setting. HOPD typically pays substantially more than ASC for the same procedure.
Source · CMS OPPS Addendum B·ASC HCPCS payment rates·2026
| Setting | Medicare rate (national) |
|---|---|
Office (PFS non-facility) Procedure performed in physician's office | $1,627.29 |
HOPD (APC 5164) Hospital outpatient department | $3,387.27 |
ASC (PI P3) Ambulatory surgical center (freestanding) | $728.41 |
Common denial reasons
The recurring reasons claims for CPT 21086 get rejected.
Source · Editorial brief grounded in CMS NCCI edits, AAOS coding appeals, and cited references ↓
- Lack of prior authorization — most commercial payers and many Medicaid programs require PA before fabrication begins
- Missing or weak medical necessity documentation — claim denied when the note doesn't specify the etiology of auricular absence
- ICD-10 mismatch — using a diagnosis code that doesn't clearly indicate structural loss of the external ear
- Duplicate service denial when billed too soon after a prior auricular prosthesis without documentation of why a replacement is needed
- Bilateral modifier miscoded — billing two units rather than one line with modifier 50 when both ears are involved
Frequently asked questions
Source · Generated from the editorial pipeline, verified against 7 cited references ↓
01Does 21086 include the cost of the prosthesis material, or just the clinical service?
02How does the 90-day global period affect follow-up visits?
03Can 21086 and an osseointegrated implant placement code be billed together?
04When is modifier 50 appropriate versus LT/RT?
05Which ICD-10 codes typically pair with 21086?
06Is 21086 covered by Medicare?
07How does 21086 differ from 21088?
Sources & references
Editorial content was developed using the following public sources. Last verified May 8, 2026.
- 01CMS Physician Fee Schedule 2026
- 02aapc.comhttps://www.aapc.com/codes/cpt-codes/21086
- 03forwardhealth.wi.govhttps://www.forwardhealth.wi.gov/WIPortal/Subsystem/KW/Print.aspx?ia=1&p=1&sa=15&s=2&c=527&nt=Custom+Preparation+of+Maxillofacial+Prosthetics&adv=Y
- 04emedny.orghttps://www.emedny.org/providermanuals/physician/pdfs/physician%20procedure%20codes%20sect5.pdf
- 05bedrockbilling.comhttps://bedrockbilling.com/static/cci/21086
- 06palmettogba.comhttps://palmettogba.com/jmb/did/j9pb8kxn1y
- 07cms.govhttps://www.cms.gov/files/document/medicare-ncci-policy-manual-2024-chapter-8.pdf
Mira AI Scribe
Mira's AI scribe captures the etiology of auricular absence (congenital, traumatic, or post-oncologic resection), the impression technique, contralateral ear reference measurements, and the planned attachment method directly from dictation. That prevents the most common denial: a claim landing without a documented clinical reason for prosthesis necessity. The scribe also flags when prior authorization status hasn't been confirmed, so the order doesn't go to fabrication before approval is secured.
See how Mira captures CPT 21086 documentation