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CPT code 01999: Unlisted anesthesia, no listed procedure-specific code2026 Medicare rate & RVUs

CPT 01999 reports anesthesia for a surgical or procedural service when no listed anesthesia code describes the service provided.

CMS RVU26DEffective Oct 1, 2026109 payment localities46 Medicare services in 2024

Medicare rate · 01999

Unlisted anesthesia, no listed procedure-specific code

Office or facility?

Work RVUs
0
Total RVUs
0.00
Global days
XXX

National rate · 2026

—

Not priced in the facility setting.

See every locality for 01999 →Billed by an NP, PA or therapist? →

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

Your location

Medicare pays by the payment locality where the service is performed.

On this page 10 sections
  1. Medicare rate
  2. What 01999 covers
  3. By payment locality
  4. Rate map
  5. How it’s calculated
  6. Payment rules
  7. Similar codes
  8. Related codes
  9. Billing questions
  10. Sources

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

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

109 of 109 payment localities

01999 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailableUnavailable
AlaskaUnavailableUnavailable
ArizonaUnavailableUnavailable
ArkansasUnavailableUnavailable
Atlanta, GAUnavailableUnavailable
Austin, TXUnavailableUnavailable
Bakersfield, CAUnavailableUnavailable
Baltimore area, MDUnavailableUnavailable
Beaumont, TXUnavailableUnavailable
Brazoria, TXUnavailableUnavailable

01999 rates by state

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

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

Explore a state

Local rates. Clear comparisons.

Hover or focus a tile to see its rate range. Select it to open the state’s fee schedule.

View every state and territory as a table
01999 office rate range by state
State / territoryOffice rate rangeLocalities
AKNo published base rate1
ALNo published base rate1
ARNo published base rate1
AZNo published base rate1
CANo published base rate29
CONo published base rate1
CTNo published base rate1
DCNo published base rate1
DENo published base rate1
FLNo published base rate3
GANo published base rate2
GUNo published base rate1
HINo published base rate1
IANo published base rate1
IDNo published base rate1
ILNo published base rate4
INNo published base rate1
KSNo published base rate1
KYNo published base rate1
LANo published base rate2
MANo published base rate2
MDNo published base rate3
MENo published base rate2
MINo published base rate2
MNNo published base rate1
MONo published base rate3
MSNo published base rate1
MTNo published base rate1
NCNo published base rate1
NDNo published base rate1
NENo published base rate1
NHNo published base rate1
NJNo published base rate2
NMNo published base rate1
NVNo published base rate1
NYNo published base rate5
OHNo published base rate1
OKNo published base rate1
ORNo published base rate2
PANo published base rate2
PRNo published base rate1
RINo published base rate1
SCNo published base rate1
SDNo published base rate1
TNNo published base rate1
TXNo published base rate8
UTNo published base rate1
VANo published base rate2
VINo published base rate1
VTNo published base rate1
WANo published base rate2
WINo published base rate1
WVNo published base rate1
WYNo published base rate1

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

Office or facility?

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

—

01999 isn’t priced in this setting.

01999 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • 01999

    Unlisted anesthesia, no listed procedure-specific code0 wRVU

    Not priced

  • 01991

    Nerve block anesthesia, non-prone procedures0 wRVU

    Not priced

  • 01992

    Prone injection anesthesia, diagnostic or therapeutic blocks0 wRVU

    Not priced

  • 01933

    Intracranial intervention, therapeutic radiology procedures0 wRVU

    Not priced

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.

Codes related to 01999

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

Codes related to 01999
CodeHow it relatesNational office range
Used instead
01991Nerve block anesthesia, non-prone proceduresListed anesthesia code for qualifying diagnostic or therapeutic nerve block and injection services in a nonprone position.No office rate
01992Prone injection anesthesia, diagnostic or therapeutic blocksListed anesthesia code for qualifying diagnostic or therapeutic nerve block and injection services with the patient prone.No office rate
01933Intracranial intervention, therapeutic radiology proceduresListed anesthesia code for therapeutic interventional radiology procedures involving intracranial procedures.No office rate

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

Open CMS sourceHow we calculate rates

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