CPT code 01999: Unlisted anesthesia, no listed procedure-specific code2026 Medicare rate & RVUs in Missouri
CPT 01999 reports anesthesia for a surgical or procedural service when no listed anesthesia code describes the service provided.
CMS doesn’t publish an office rate for 01999 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 01999 covers
CPT 01999 is used for anesthesia furnished with a surgical or other procedural service when no listed anesthesia code describes the service. It is not tied to a particular body region or anesthetic technique; the underlying procedure may involve any site. An anesthesiologist or CRNA reports the anesthesia service, while the clinician performing the intervention reports that procedure under its own code.
Choose a listed anesthesia code whenever it describes the service; 01999 is not a substitute for codes covering procedures such as nerve blocks, interventional radiology, or delivery. The anesthesia record should identify the intervention, site, technique, anesthesia personnel, and start and end times; the operative or procedure report should describe the intervention and its extent, with documentation explaining why no listed anesthesia code fits. Medicare calculates payment as (base units + time units) × the locality’s anesthesia conversion factor. Report anesthesia time in minutes; CMS converts it to 15-minute units to one decimal place, from preparation until the practitioner is no longer in personal attendance and the patient can safely be placed under postoperative care.
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 01999 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 01999 rate is calculated
Each of 01999’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 · 01999
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 01999
01999 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 · 01999
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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01999 isn’t priced in this setting.
01999 compared with similar codes
Compare codes · National
4 codes, side by side
How to choose
- 01991Nerve block anesthesiaNon-prone procedures
- 01991 is the listed choice for qualifying diagnostic or therapeutic nerve block and injection services in a nonprone position. Use 01999 only when no listed code describes the anesthesia service.
- 01992Prone injection anesthesiaDiagnostic or therapeutic blocks
- 01992 is the listed choice for qualifying diagnostic or therapeutic nerve block and injection services with the patient prone. Use 01999 only when no listed code describes the service.
- 01933Intracranial interventionTherapeutic radiology procedures
- 01933 covers anesthesia for therapeutic interventional radiology procedures involving intracranial procedures. Choose it when the service fits that listed code rather than reporting it as unlisted.
01999 billing questions
When should I use 01999 instead of a listed anesthesia code?
Use 01999 when no specific anesthesia code describes the service provided. If a listed code describes the procedure and circumstances, report that code instead.
How does 01999 differ from 01991 and 01992?
01991 and 01992 describe listed anesthesia services for diagnostic or therapeutic nerve blocks and injections, with the applicable code depending on patient position. Use 01999 only when no listed code fits.
Does 01999 include the underlying procedure?
No. It reports the anesthesia service; the clinician performing the intervention reports that procedure under its applicable code.
What documentation supports a 01999 claim?
The anesthesia record should identify the intervention, site, technique, personnel, and anesthesia times. The operative or procedure report should describe the intervention and its extent.
How are Medicare units calculated for 01999?
Medicare calculates anesthesia payment as (base units + time units) × the locality’s anesthesia conversion factor. Time is reported in minutes and converted to 15-minute units to one decimal place.
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
Fee sheets · Coming soon
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