CPT code 01404: Knee disarticulation, amputation through knee joint2026 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 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

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

109 of 109 payment localities

01404 rates by state

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

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.

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.

01404 compared with similar codes

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.

Codes related to 01404

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