CPT code 01404: Knee disarticulation, amputation through knee joint2026 Medicare rate & RVUs in Missouri
Anesthesia for disarticulation at the knee joint, reported for the operative procedure rather than routine knee surgery or amputation at another level.
CMS doesn’t publish an office rate for 01404 in Missouri.
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 01404 covers
This service covers anesthesia for disarticulation through the knee joint, where the limb is separated at the knee rather than through the lower leg or thigh. An anesthesiologist or CRNA typically provides and reports the anesthesia for the operative encounter in a hospital or other surgical facility. The operative team performs the amputation; the anesthesia record documents the practitioner’s care of the patient during the procedure.
Choose 01404 when the operative report establishes disarticulation at the knee. It is distinct from general open or arthroscopic knee-joint procedures and from total knee replacement. The record should identify the operative level and procedure, and the anesthesia record should support the reported anesthesia time. Medicare payment is (5 base units + time units) multiplied by the anesthesia conversion factor for the locality. Time is reported in minutes and converted to 15-minute units to one decimal place, starting with anesthesia preparation and ending when personal attendance ends and the patient can safely be placed under postoperative care; the conversion factor varies by locality.
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 01404 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.
| Payment locality | Office | Facility |
|---|---|---|
| Metropolitan Kansas City, MO | Unavailable | Unavailable |
| Metropolitan St. Louis, MO | Unavailable | Unavailable |
| Rest of Missouri | Unavailable | Unavailable |
How the 01404 rate is calculated
Each of 01404’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 · 01404
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 01404
01404 has no global surgery period, no multiple-procedure, bilateral or assistant-at-surgery adjustment, and no professional/technical split. What changes the payment is where the service happens: the place of service on the claim decides whether Medicare pays the office or the facility rate.
Place of service · 01404
Which rate does Medicare pay?
The POS code on the claim line (CMS-1500 box 24B).
POS 11 · non-facility rate · national
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01404 isn’t priced in this setting.
01404 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 01400Knee surgery anesthesiaOpen or arthroscopic procedures
- Use 01404 for amputation through the knee joint; use 01400 for other open or arthroscopic knee-joint procedures.
- 01402Knee replacement anesthesiaTotal knee arthroplasty
- 01402 identifies anesthesia for total knee arthroplasty. 01404 is for disarticulation at the knee, not joint replacement.
- 01420Knee cast anesthesiaApplication, removal, or repair
- 01420 is for anesthesia during closed knee-joint procedures; 01404 is for disarticulation at the knee.
01404 billing questions
How does 01404 differ from 01400?
01404 is for disarticulation through the knee joint. Use 01400 for other open or arthroscopic knee-joint procedures that do not meet the specific disarticulation description.
Does total knee replacement use 01404?
No. Anesthesia for total knee arthroplasty is reported with 01402.
What should the operative record show?
It should establish that the amputation level is through the knee joint. A below-knee or above-knee level is not a knee disarticulation.
How are Medicare anesthesia units calculated?
This code has 5 base units. Medicare adds time units, calculated from anesthesia minutes in 15-minute units to one decimal place, then multiplies the total by the locality anesthesia conversion factor.
What time should the anesthesia record support?
Document the minutes from when the anesthesia practitioner begins preparing the patient until the practitioner is no longer in personal attendance and the patient can safely be placed under postoperative care.
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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