$257.37–$278.84
42310 describes drainage through an intraoral approach; 42320 is the corresponding external-approach drainage service. Use the approach documented in the operative report.
On this page
CMS RVU26D · Effective 2026-10-01
42310 Salivary drainage Medicare reimbursement rates in Oregon
Reports intraoral drainage of a salivary gland when the clinician treats a collection requiring drainage through an oral approach. Compare 42310 office and facility rates across CMS payment localities in Oregon.
Amounts below use the non-QP conversion factor for participating physicians. These are base physician payments before claim-level adjustments, not patient costs or total hospital charges.
What does Medicare pay for 42310 in Oregon?
Oregon has 2 payment localities in this comparison. Use the service location to choose the applicable amount. These are the supported base rates for the 2 payment areas shown below, using the same CMS release.
Office / nonfacility
$180.36–$195.68
2 of 2 localities have a supported rate.
Facility setting
$125.47–$134.45
2 of 2 localities have a supported rate.
These are locality ranges, not averages or address-specific quotes. A facility-setting amount covers the physician service; it does not include a hospital’s separate bill. Choose a locality below to inspect its calculation, compare other payment areas, or price a percentage of Medicare.
ENT procedure
About 42310: Intraoral salivary gland drainage
Reports intraoral drainage of a salivary gland when the clinician treats a collection requiring drainage through an oral approach.
CPT 42310 describes drainage of a salivary gland through an intraoral approach. It is generally performed by an otolaryngologist or oral and maxillofacial surgeon when a salivary gland or duct collection needs operative drainage through the mouth. The operative note should identify the gland and side, the intraoral route, the condition treated, and the drainage performed. This is distinct from removing a salivary stone, which is reported with a stone-removal code when that is the service performed.
Report 42310 for the intraoral drainage service, not for stone extraction alone or for a drainage procedure performed through an external approach. Documentation should support the clinical indication, site, approach, and work performed. Medicare assigns a 10-day global period, so related postoperative visits during that period are included. When multiple 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 for this code. Assistant-at-surgery payment requires documented medical necessity; co-surgeons and team surgery are not permitted.
CMS billing rules for 42310
- Global period
- Minor procedure with a 10-day global period: related postoperative visits for 10 days are included.
- Multiple procedures
- Standard multiple procedure reduction: the highest-valued procedure is paid in full and others at 50% when performed in the same session.
- Bilateral procedures
- Bilateral adjustment does not apply; the descriptor or anatomy makes modifier 50 inappropriate.
- Assistant at surgery
- Assistant at surgery is paid only with documentation of medical necessity.
- Co-surgeons
- Co-surgeons not permitted.
- Team surgery
- Team surgery not permitted.
Where the value comes from
- Work RVU1.57 · 29%
- Practice expense (office) RVU3.69 · 67%
- Malpractice RVU0.22 · 4%
14
Medicare services in 2024 · #6100 by national volume
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.
42310 compared with similar codes
Office rates for Oregon, from the same CMS release.
$211.29–$228.92
42300 is for simple drainage of a parotid abscess. Use 42310 for the intraoral salivary-gland drainage service when the documented procedure fits that description.
No office rate
42305 is for complicated drainage of a parotid abscess. The parotid abscess service is distinct from the intraoral salivary-gland drainage described by 42310.
$233.93–$253.19
42330 covers intraoral removal of a salivary duct stone. Choose it when stone extraction is performed, rather than drainage without stone removal.
Compare 42310 by payment locality
Find the payment area for your service address, then open its rate page for calculation inputs, release history and the percentage-of-Medicare tool. A city may cross payment-area boundaries; the ZIP lookup above helps resolve the location.
2 of 2 payment localities
Portland →
Office / nonfacility
$195.68
Facility
$134.45
Rest Of Oregon →
Office / nonfacility
$180.36
Facility
$125.47
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42310 billing questions
How is 42310 distinguished from 42320?
42310 is for salivary gland drainage through an intraoral approach. The approach documented in the operative report distinguishes it from 42320, which is the external-approach service.
Can 42310 be reported for removing a salivary stone?
No. When the procedure removes a salivary calculus, use the applicable stone-removal code, such as 42330 for intraoral duct stone removal, rather than reporting drainage alone.
Is modifier 50 appropriate for bilateral drainage?
No. CMS does not apply a bilateral adjustment to 42310, and modifier 50 is inappropriate for this code.
What documentation supports 42310?
Document the treated gland and side, the condition prompting drainage, the intraoral approach, and the drainage work performed. The note should make clear that drainage, rather than stone removal alone, was the service.
How are related postoperative visits handled?
The code has a 10-day global period, so related postoperative visits during those 10 days are included in the procedure payment.
When is an assistant at surgery payable?
Assistant-at-surgery payment is allowed only when medical necessity is documented. Co-surgeons and team surgery are not permitted.
Where these rates come from
FeeBase calculates base physician payments from CMS work, practice-expense, and malpractice RVUs, adjusted by each locality’s geographic indices and the applicable conversion factor. Unavailable or separately priced services are labeled rather than assigned a made-up amount.
Source: RVU26D. Effective 2026-10-01 through the day before 2027-01-01.
5,01942300,,Drainage of salivary gland,A,,1.93,4.23,,2.05,,0.26,6.42,4.24,0,010,0.10,0.80,0.10,2,0,1,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
5,02042305,,Drainage of salivary gland,A,,6.15,4.47,NA,4.47,,0.90,11.52,11.52,0,090,0.09,0.81,0.10,2,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
5,0214230F,,Anticonv thxpy for 6 mos/>,I,,0.00,0.00,,0.00,,0.00,0.00,0.00,9,XXX,0.00,0.00,0.00,9,9,9,9,9,9,,33.4009,09,0,99,0.00,0.00,0.00
5,02242310,,Drainage of salivary gland,A,,1.57,3.69,,2.04,,0.22,5.48,3.83,0,010,0.10,0.80,0.10,2,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
5,02342320,,Drainage of salivary gland,A,,2.34,5.14,,2.16,,0.35,7.83,4.85,0,010,0.10,0.80,0.10,2,0,0,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
5,02442330,,Removal of salivary stone,A,,2.20,4.59,,1.97,,0.33,7.12,4.50,0,010,0.10,0.80,0.10,2,0,1,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00
5,02542335,,Removal of salivary stone,A,,3.32,9.03,,3.37,,0.48,12.83,7.17,0,090,0.09,0.81,0.10,2,0,1,0,0,9,,33.4009,09,0,99,0.00,0.00,0.00