CPT code 27899: Unlisted procedure, leg or ankle2026 Medicare rate & RVUs in Michigan
Reports a leg or ankle procedure when no specific CPT code adequately describes the service performed.
CMS doesn’t publish an office rate for 27899 in Michigan.
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 27899 covers
CPT 27899 identifies an unlisted procedure involving the leg or ankle, used when no listed CPT code adequately describes the work. The clinician reporting the operation selects it after comparing the procedure with codes for the specific anatomic site and service. The operative documentation should identify the work performed and the anatomic site so the contractor can assess the unlisted service; use a listed code when it accurately describes the procedure.
Medicare assigns physician fee schedule status C (carrier priced): CMS publishes no national payment, and the Medicare Administrative Contractor sets payment for each claim. The contractor also sets the global period. When multiple procedures are performed in the same session, the highest-valued procedure is paid in full and the others are subject to the standard multiple-procedure reduction. For bilateral procedures, modifier 50 applies under Medicare’s bilateral pricing rule.
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 27899 pays more and less in Michigan
| Payment locality | Office | Facility |
|---|---|---|
| Detroit, MI | Unavailable | Unavailable |
| Rest of Michigan | Unavailable | Unavailable |
How the 27899 rate is calculated
Each of 27899’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 · 27899
RVUs × geographic indexes × conversion factor
Work0.00
0.00 RVUs× 1.000 GPCI
Practice expense0.00
0.00 RVUs× 1.000 GPCI
Malpractice0.00
0.00 RVUs× 1.000 GPCI
Adjusted RVUs
0.0000
Conversion factor
$33.4009
Medicare rate
$0.00
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 27899
The CMS indicators that decide how 27899 is paid alongside other services.
CMS payment indicators · 27899
Unlisted procedure, leg or ankle
| Rule | CMS value | What it means |
|---|---|---|
| Global period | YYY | The Medicare contractor sets the global period. |
| Multiple procedures | 2 | Standard reduction: highest-valued procedure at 100%, others at 50%. |
| 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) | 1 | Permitted with supporting documentation. |
| Team surgery (66) | 1 | Permitted with supporting documentation. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
What modifiers do to the payment
Modifier 50 · payment effect
With and without the modifier
27899 without 50 · national facility
$0.00
Unlisted procedure, leg or ankle
27899-50 · Bilateral: 150%
$0.00
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).
27899 compared with similar codes
Compare codes · National
5 codes, side by side
How to choose
- 27826Fracture repairPosterior malleolus
- This is a listed code for lower-leg fracture treatment. Use 27899 only when the procedure is not adequately described by a specific fracture-treatment code.
- 27840Ankle dislocationClosed, without anesthesia
- This is a listed ankle dislocation treatment code. Use it when it describes the procedure rather than reporting the unlisted code.
- 27870Ankle fusionOpen approach
- This code describes open ankle fusion. Report it when it accurately represents the procedure instead of 27899.
- 27892Leg fasciotomyAnterior/lateral with debridement
- This is a listed leg decompression code. Use 27899 only when the service performed is not described by that specific code.
27899 billing questions
When should I report 27899 instead of a listed leg or ankle code?
Use 27899 when no listed CPT code adequately describes the procedure. Report a listed code when it accurately represents the work performed.
What documentation should accompany 27899?
The operative documentation should identify the work performed and the anatomic site so the Medicare contractor can assess the unlisted service.
How does Medicare price 27899?
It has physician fee schedule status C, or carrier priced. The Medicare Administrative Contractor sets payment for each claim; CMS publishes no national payment.
Does the Medicare contractor set a global period for 27899?
Yes. The Medicare contractor sets the global period.
Can modifier 50 be used for a bilateral procedure?
Yes. Medicare’s bilateral pricing rule applies to a bilateral procedure reported with modifier 50.
What happens when 27899 is performed with another procedure in the same session?
The highest-valued procedure is paid in full, and the other procedures are subject to the standard multiple-procedure reduction.
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
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