CPT code 27598: Leg amputation, through knee joint2026 Medicare rate & RVUs in New York
Removal of the lower leg through the knee joint is reported for a knee-disarticulation amputation, rather than an amputation through the femur.
CMS doesn’t publish an office rate for 27598 in New York.
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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What 27598 covers
At knee-disarticulation surgery, the surgeon separates the lower leg through the knee joint, leaving the femur intact. Orthopedic, vascular, or trauma surgeons may perform this operation for nonviable tissue from severe limb ischemia or infection, or for devastating injury, generally in an operating room. The operative report should establish the amputation level; a cut through the tibia below the knee or through the femur above the knee is a different level.
Report the service for the through-knee procedure and document the indication, operative level, and side. CMS assigns a 90-day global period, including the day-before preoperative visit and 90 days of related postoperative care. When multiple procedures occur in the same session, the highest-valued procedure is paid in full and the others at 50%. For bilateral surgery, modifier 50 is paid at 150%. An assistant at surgery may be paid; co-surgeons require supporting documentation, and team surgery is 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 27598 pays more and less in New York
The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.
| Payment locality | Office | Facility |
|---|---|---|
| Manhattan, NY | Unavailable | $751.85 |
| NYC suburbs and Long Island, NY | Unavailable | $781.16 |
| Poughkeepsie and northern NYC suburbs, NY | Unavailable | $698.59 |
| Queens, NY | Unavailable | $742.82 |
| Rest of New York | Unavailable | $609.28 |
How the 27598 rate is calculated
Each of 27598’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 · 27598
RVUs × geographic indexes × conversion factor
Work10.94
10.94 RVUs× 1.000 GPCI
Practice expense5.71
5.71 RVUs× 1.000 GPCI
Malpractice2.67
2.67 RVUs× 1.000 GPCI
Adjusted RVUs
19.3200
Conversion factor
$33.4009
Medicare rate
$645.31
Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.
Payment rules and modifiers for 27598
27598 has a 90-day global period: related visits in that window are included in the surgery payment.
CMS payment indicators · 27598
Leg amputation, through knee joint
| 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) | 1 | Bilateral with modifier 50 pays 150% of the fee schedule amount. |
| Assistant at surgery (80/81/82/AS) | 2 | Paid. |
| Co-surgeons (62) | 1 | Permitted with supporting documentation. |
| Team surgery (66) | 0 | Not permitted. |
| Professional/technical | 0 | Physician service: no professional/technical split. |
| Split (54/55/56) | 0.10/0.69/0.21 | Share of the payment for pre-op, the procedure itself, and post-op care. |
Global surgery period · 27598
Leg amputation, through knee joint
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 50 · payment effect
With and without the modifier
27598 without 50 · national facility
$645.31
Leg amputation, through knee joint
27598-50 · Bilateral: 150%
$967.96
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).
27598 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 27590Thigh amputationThrough femur, any level
- Choose 27598 for disarticulation through the knee joint. Code 27590 describes an amputation through the femur.
- 27591Thigh amputationPrimary closure
- Code 27591 is a femoral-level amputation with primary closure, not a through-knee amputation.
- 27592Thigh amputationImmediate prosthesis fitting
- Code 27592 describes an open, circular amputation through the femur; 27598 is performed through the knee joint.
27598 billing questions
How does 27598 differ from 27590?
27598 is an amputation through the knee joint. Code 27590 describes an amputation through the femur, above the knee.
Does the 90-day global period include postoperative care?
Yes. The global period includes the day-before preoperative visit and 90 days of related postoperative care.
How is a bilateral through-knee amputation reported?
For bilateral surgery, report modifier 50; CMS pays the bilateral procedure at 150%.
Can an assistant or co-surgeon be reported?
An assistant at surgery may be paid. Co-surgeons are paid only with supporting documentation, and team surgery is not permitted.
What documentation supports this code?
The operative report should establish that the amputation was performed through the knee joint and identify the indication and side.
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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