CPT code 41018: Abscess drainage, parapharyngeal space, external approach2026 Medicare rate & RVUs in Missouri
Reports surgical drainage of an abscess in the parapharyngeal space through an external approach, typically for a deep neck infection requiring operative access.
Medicare pays $498.88–$531.46 for 41018 in the office in Missouri, from Rest of Missouri to Metropolitan St. Louis, MO. Which amount applies depends on the service address.
Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.
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On this page 9 sections
What 41018 covers
This service involves surgically opening and draining an infected collection in the parapharyngeal space through an external, typically transcervical, approach. It is generally performed by an otolaryngologist or oral and maxillofacial surgeon in an operating room when the infection’s location or extent calls for operative access to this deep space. The operative work addresses the parapharyngeal collection, rather than a more superficial mouth or neck abscess.
Report the code when the documented site is the parapharyngeal space and the surgeon performs external drainage. The operative note should identify the involved space, approach, and drainage performed; a general diagnosis of a neck abscess alone does not establish the specific service. This major surgery has a 90-day global period, including the day-before preoperative visit and related postoperative care during that period. When other procedures are performed in the same session, the highest-valued procedure is paid in full and other procedures are subject to the standard multiple-procedure reduction. Modifier 50 is inappropriate. Assistant-at-surgery payment requires documented medical necessity; co-surgeons and team surgery are not permitted.
This summary was written with AI assistance from CMS physician fee schedule data and checked against the CMS billing rules shown here. Rates on this page come directly from CMS files.
Where 41018 pays more and less in Missouri
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
3 payment localities
$498.88 to $531.46
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City, MO | $526.26 | $363.17 |
| Metropolitan St. Louis, MO | $531.46 | $366.12 |
| Rest of Missouri | $498.88 | $349.16 |
How the 41018 rate is calculated
Each of 41018’s three RVUs is multiplied by a geographic index (GPCI) for the payment locality, added up, and multiplied by the conversion factor. Drag the indexes or enter a ZIP to see what moves the rate.
How the rate is built · 41018
RVUs × geographic indexes × conversion factor
Work5.09
5.09 RVUs× 1.000 GPCI
Practice expense10.62
10.62 RVUs× 1.000 GPCI
Malpractice0.71
0.71 RVUs× 1.000 GPCI
Adjusted RVUs
16.4200
Conversion factor
$33.4009
Medicare rate
$548.44
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 41018
41018 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 41018
Abscess drainage, parapharyngeal space, external approach
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 090 | Major surgery: the day before, the day of, and 90 days after are included. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| Bilateral (modifier 50) | 0 | The 150% bilateral adjustment doesn’t apply. |
| Assistant at surgery (80/81/82/AS) | 0 | Not paid without supporting documentation. |
| Co-surgeons (62) | 0 | Not permitted. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.09/0.81/0.10 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 41018
Abscess drainage, parapharyngeal space, external approach
90-day global period ends
Dec 30, 2026
Covers Sep 30, 2026 through Dec 30, 2026 (92 days, including the day before surgery).
Visit on Oct 31, 2026
Day 30 of the 90-day post-op period: related follow-up care is included in the surgical payment.
Pre-op dayGlobal period
What modifiers do to the payment
Modifier 51 · payment effect
With and without the modifier
41018 without 51 · national office
$548.44
Abscess drainage, parapharyngeal space, external approach
41018-51 · Second procedure: 50%
$274.22
When this isn’t the highest-valued procedure in the session, Medicare pays 50% of its fee schedule amount (the highest is paid at 100%).
41018 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 41017Lesion drainageFloor of mouth, intraoral
- This code is for the parapharyngeal space; 41017 is for the masticator space. Select according to the documented site of the drained collection.
- 41016Abscess drainageIntraoral deep-space approach
- 41016 identifies drainage of a floor-of-mouth abscess by a submandibular approach. This code identifies external drainage of a parapharyngeal-space collection.
- 41008Tongue drainageIntraoral approach
- 41008 is for intraoral drainage of a peritonsillar collection. This code is for external drainage of a collection in the parapharyngeal space.
41018 billing questions
How is this distinguished from drainage of a masticator-space abscess?
Use this code for drainage of a parapharyngeal-space collection by an external approach. A collection in the masticator space belongs to the code for that space, even when the infection is also described as a deep neck infection.
Does an intraoral drainage approach qualify?
This code describes external drainage. Confirm the documented operative approach and the infected space rather than selecting the code from the diagnosis alone.
What documentation supports reporting this code?
The operative report should identify the parapharyngeal space, describe the external approach, and document that the collection was surgically drained.
Is the related postoperative care separately reported during the global period?
The 90-day global period includes the day-before preoperative visit and related postoperative care. The code’s global period does not make unrelated services part of that package.
Can an assistant surgeon or co-surgeon be reported?
Assistant-at-surgery payment is allowed only when medical necessity is documented. Co-surgeons and team surgery are not permitted for this code.
How is payment adjusted when another procedure is performed in the same session?
The highest-valued procedure is paid in full, and the other procedure or procedures are subject to the standard multiple-procedure reduction. Modifier 50 is inappropriate for this code.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense and malpractice RVUs, adjusted by each locality’s geographic indexes and the conversion factor. Services without a published rate are labeled, never given a made-up amount. Amounts are Medicare allowed amounts before claim adjustments: not a patient’s bill or a commercial rate.
CMS RVU26D · effective Oct 1, 2026 through the day before Jan 1, 2027
Show the CMS file lines behind this rate
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