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CPT code 61799: Cranial radiosurgery, each additional complex lesion2026 Medicare rate & RVUs

Reports each additional complex intracranial lesion treated during a cranial stereotactic radiosurgery session when the primary complex-lesion service is also reported.

CMS RVU26DEffective Oct 1, 2026109 payment localities778 Medicare services in 2024

Medicare pays $275.56 for 61799 nationally in a facility.

Medicare rate · 61799

Cranial radiosurgery, each additional complex lesion

Office or facility?

Work RVUs
4.69
Total RVUs
8.25
Global days
ZZZ

National rate · 2026

$275.56

Facility setting, before claim adjustments.

See every locality for 61799 →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 61799 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 61799 covers

This add-on represents treatment of another complex intracranial lesion during cranial stereotactic radiosurgery. SRS delivers focused radiation to a defined target using stereotactic localization. Neurosurgeons and radiation oncologists may participate in planning and treatment, commonly for intracranial tumors or vascular lesions. The complex-versus-simple classification follows the applicable CPT criteria; the lesion diagnosis alone does not establish the code level.

Report 61799 for each additional complex lesion treated in the same service, with 61798 for the primary complex lesion. The record should support the number of distinct lesions treated and the basis for classifying them as complex under CPT guidance. CMS identifies 61799 as an add-on code: it is billed only with a primary procedure and paid within that procedure’s global period.

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 61799 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

61799 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailable$240.77
AlaskaUnavailable$328.48
ArizonaUnavailable$264.59
ArkansasUnavailable$236.62
Atlanta, GAUnavailable$289.86
Austin, TXUnavailable$271.68
Bakersfield, CAUnavailable$258.56
Baltimore area, MDUnavailable$297.32
Beaumont, TXUnavailable$266.08
Brazoria, TXUnavailable$262.14

61799 rates by state

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

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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
61799 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 61799 rate is calculated

Each of 61799’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 · 61799

RVUs × geographic indexes × conversion factor

Office or facility?

Work4.69

4.69 RVUs× 1.000 GPCI

Practice expense1.63

1.63 RVUs× 1.000 GPCI

Malpractice1.93

1.93 RVUs× 1.000 GPCI

Adjusted RVUs

8.2500

Conversion factor

$33.4009

Medicare rate

$275.56

Every GPCI starts at 1.000, the national rate. Enter a ZIP or drag a slider.

Payment rules and modifiers for 61799

The CMS indicators that decide how 61799 is paid alongside other services.

CMS payment indicators · 61799

Cranial radiosurgery, each additional complex lesion

RuleCMS valueWhat it means
Global periodZZZAdd-on code: falls within the primary procedure’s global period.
Multiple procedures0No multiple-procedure reduction.
Bilateral (modifier 50)0The 150% bilateral adjustment doesn’t apply.
Assistant at surgery (80/81/82/AS)2Paid.
Co-surgeons (62)0Not permitted.
Team surgery (66)0Not permitted.
Professional/technical0Physician service: no professional/technical split.

What modifiers do to the payment

Modifier 80 · payment effect

With and without the modifier

61799 without 80 · national facility

$275.56

Cranial radiosurgery, each additional complex lesion

61799-80 · Assistant: 16%

$44.09

A physician assistant at surgery is paid 16% of the surgeon’s fee schedule amount.

When to use modifier 80

61799 compared with similar codes

Compare codes · National

4 codes, side by side

Office or facility?

  • 61799

    Cranial radiosurgery, each additional complex lesion4.69 wRVU

    Not priced

  • 61798

    Cranial radiosurgery, complex lesion19.35 wRVU

    Not priced

  • 61797

    Cranial radiosurgery, each additional simple lesion3.39 wRVU

    Not priced

  • 61796

    Cranial radiosurgery, simple lesion13.58 wRVU

    Not priced

How to choose

61798Cranial radiosurgeryComplex lesion
61798 reports the primary complex cranial lesion; 61799 reports each additional complex lesion in the same SRS service.
61797Cranial radiosurgeryEach additional simple lesion
Both are additional-lesion SRS codes. The distinction is whether the lesion meets the CPT criteria for complex or simple classification.
61796Cranial radiosurgerySimple lesion
61796 is the primary code for a simple cranial lesion. It is not the add-on for an additional complex lesion.

Codes related to 61799

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

Codes related to 61799
CodeHow it relatesNational office range
Add-on codes
61798Cranial radiosurgery, complex lesionPrimary complex cranial SRS lesion code reported with this add-on.No office rate
Same family
61797Cranial radiosurgery, each additional simple lesionReports each additional simple cranial lesion treated with SRS.No office rate
Used instead
61796Cranial radiosurgery, simple lesionPrimary cranial SRS code for a simple lesion rather than a complex lesion.No office rate

61799 billing questions

Which primary code must accompany 61799?

For additional complex cranial lesions, report 61799 with 61798 for the primary complex lesion. The add-on code is not reported by itself.

How many units of 61799 should be reported?

Report one unit for each additional complex lesion treated. The record should make the number of separately treated lesions clear.

How is 61799 distinguished from 61797?

Both report additional cranial lesions treated with SRS. Use 61799 for a complex lesion and 61797 for a simple lesion, applying the CPT criteria for that distinction.

Does the diagnosis determine whether a lesion is complex?

No. A diagnosis such as an intracranial tumor or vascular lesion does not by itself establish complexity; the applicable CPT criteria support the code level.

What documentation supports 61799?

Document the SRS treatment, each lesion treated, and the basis for classifying the additional lesion as complex under CPT guidance. The primary complex-lesion service should also be documented and reported.

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

Show the CMS file lines behind this rate
RVUs for 61799PPRRVU2026_Oct_nonQPP.csv, line 6,892 (RVU26D)

Open CMS sourceHow we calculate rates

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