CPT code 01400: Knee surgery anesthesia, open or arthroscopic procedures2026 Medicare rate & RVUs in Michigan
Anesthesia for open or arthroscopic knee-joint procedures other than total knee arthroplasty or disarticulation at the knee.
CMS doesn’t publish an office rate for 01400 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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What 01400 covers
This service covers anesthesia for open or arthroscopic surgery involving the knee joint, including arthroscopic meniscal or ligament procedures and other open joint operations. An anesthesiologist or CRNA provides and reports the anesthesia, commonly in a hospital or ambulatory surgery center; the surgeon reports the operative procedure separately.
Select 01400 for knee-joint operations other than total knee arthroplasty or disarticulation at the knee. The anesthesia record should identify the operation and approach and document anesthesia start and end times; the operative report should support the procedure and knee site. The code carries 4 base units, and Medicare payment is (base units + time units) multiplied by the locality’s anesthesia conversion factor. Anesthesia time runs from when the practitioner begins preparing the patient for anesthesia until personal attendance ends and the patient can safely be placed under postoperative care; minutes convert to 15-minute time units, calculated to one decimal place.
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 01400 pays more and less in Michigan
| Payment locality | Office | Facility |
|---|---|---|
| Detroit, MI | Unavailable | Unavailable |
| Rest of Michigan | Unavailable | Unavailable |
How the 01400 rate is calculated
Each of 01400’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 · 01400
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 01400
01400 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 · 01400
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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01400 isn’t priced in this setting.
01400 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 01402Knee replacement anesthesiaTotal knee arthroplasty
- Choose 01402 for total knee arthroplasty; 01400 is for other open or arthroscopic knee-joint procedures.
- 01404Knee disarticulationAmputation through knee joint
- Choose 01404 for disarticulation at the knee, not open or arthroscopic knee-joint surgery.
- 01420Knee cast anesthesiaApplication, removal, or repair
- 01420 covers anesthesia for knee-joint cast application, removal, or repair; 01400 covers open or arthroscopic knee-joint surgery.
01400 billing questions
When should 01400 be used instead of 01402?
Use 01400 for other open or arthroscopic knee-joint procedures. Use 01402 for anesthesia during total knee arthroplasty.
Does 01400 cover knee disarticulation?
No. Anesthesia for disarticulation at the knee is reported with 01404.
What should the records show?
The anesthesia record should support the knee operation and approach and document anesthesia start and end times. The operative report should identify the procedure and knee site.
How are anesthesia units calculated for 01400?
The code has 4 base units. Medicare adds anesthesia time units and multiplies the total by the anesthesia conversion factor for the payment locality.
Is 01400 the code for anesthesia during knee cast work?
No. Anesthesia for knee-joint cast application, removal, or repair is described by 01420.
Is the surgeon’s knee procedure included in 01400?
No. 01400 reports the anesthesia service; the surgeon reports the operative procedure separately.
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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