CPT code 01400: Knee surgery anesthesia, open or arthroscopic procedures2026 Medicare rate & RVUs

Medicare allowed amount for participating (non-QP) physicians, before deductible, coinsurance and claim adjustments. Not a patient’s bill or a hospital charge.

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

The same RVUs, adjusted for each area’s costs. Open a locality for its calculation, history and nearby areas.

109 of 109 payment localities

01400 rates by state

Office rate range in each state. Select a state to see its payment localities.

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.

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.

01400 compared with similar codes

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.

Codes related to 01400

Related codes aren’t interchangeable: bill the code that matches the service performed.

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

Open CMS sourceHow we calculate rates