CPT code 31297: Sinus dilation, sphenoid ostium2026 Medicare rate & RVUs in Bartlett, Illinois
CPT 31297: $1,587.99–$1,614.11 office ($134.29–$139.87 facility) across 2 localities in Bartlett, IL in 2026 Medicare. Compare each area.
Medicare pays $1,587.99–$1,614.11 for 31297 in the office in Bartlett, Illinois, from Chicago, IL to Suburban Chicago, IL. 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.
On this page 6 sections
Where 31297 pays more and less in Bartlett, Illinois
Bartlett, Illinois maps to 2 Medicare payment localities in our Census-to-CMS crosswalk. A city name alone doesn’t confirm an address’s payment area.
| Payment locality | Office | Facility |
|---|---|---|
| Chicago, IL | $1,587.99 | $139.87 |
| Suburban Chicago, IL | $1,614.11 | $134.29 |
How payment areas work in Bartlett
City limits and Medicare payment areas are different maps. These are the payment areas that cover the city’s counties; the service ZIP decides which one applies.
- Chicago · Cook County
- Suburban Chicago · DuPage County, Kane County
City boundaries: 2026 Census geography · Census source · CMS county-to-locality definitions
How the 31297 rate is calculated
Each of 31297’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 · 31297
RVUs × geographic indexes × conversion factor
Work2.38
2.38 RVUs× 1.000 GPCI
Practice expense44.10
44.10 RVUs× 1.000 GPCI
Malpractice0.36
0.36 RVUs× 1.000 GPCI
Adjusted RVUs
46.8400
Conversion factor
$33.4009
Medicare rate
$1,564.50
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 31297
The CMS indicators that decide how 31297 is paid alongside other services.
CMS payment indicators · 31297
Sinus dilation, sphenoid ostium
| Rule | CMS value | What it means |
|---|---|---|
| Global period | 000 | Same-day global: pre- and post-op care on the day of the procedure is included. |
| Multiple procedures | 3 | Endoscopy family rules apply. |
| Bilateral (modifier 50) | 1 | Bilateral with modifier 50 pays 150% of the fee schedule amount. |
| 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. |
What modifiers do to the payment
Modifier 50 · payment effect
With and without the modifier
31297 without 50 · national office
$1,564.50
Sinus dilation, sphenoid ostium
31297-50 · Bilateral: 150%
$2,346.75
Both sides on one line with modifier 50 are paid at 150% of the fee schedule amount (subject to multiple-procedure rules with other procedures).
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
Fee sheets · Coming soon
Put 31297 and the rest of your codes on one sheet
Your codes at your locality, with payer contracts beside Medicare.
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