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Billing code 63621: Spinal radiosurgeryMedicare rate & RVUs

Report this add-on for each spinal lesion treated after the first during stereotactic radiosurgery, alongside the primary spinal lesion procedure.

CMS RVU26DEffective Oct 1, 2026109 payment localities168 Medicare services in 2024

Medicare pays $230.80 for 63621 nationally in a facility.

Medicare rate · 63621

Spinal radiosurgery

Swap in your local Medicare rate.

Work RVUs
3.9
Total RVUs
6.91
Global days
ZZZ

National rate · 2026

$230.80

Facility setting, before claim adjustments.

See every locality for 63621 → · 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.

On this page 10 sections
  1. Medicare rate
  2. What 63621 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 63621 covers

Code 63621 represents treatment of an additional spinal lesion during stereotactic radiosurgery (SRS), after the first lesion is treated. SRS uses highly focused radiation directed at a defined target, such as a spinal tumor or metastasis. Neurosurgeons and radiation oncologists may participate in the treatment, with services performed in a radiation oncology or hospital setting. This code identifies the additional lesion work; it is not used for surgical removal of a spinal cord lesion.

Report 63621 with the primary spinal SRS code 63620, for each additional lesion treated. Documentation should support the number of distinct spinal lesions treated and their inclusion in the SRS treatment. CMS classifies 63621 as an add-on code: it is billed only with a primary procedure and its payment falls within that procedure’s global period. It does not stand alone as a separate primary service.

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 63621 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

63621 office and facility rates by payment locality
Payment localityOfficeFacility
AlabamaUnavailable$201.31
Alaska*Unavailable$274.31
ArizonaUnavailable$221.49
ArkansasUnavailable$197.78
AtlantaUnavailable$242.93
AustinUnavailable$227.47
BakersfieldUnavailable$216.25
Baltimore/Surr. CntysUnavailable$249.21
BeaumontUnavailable$222.79
BrazoriaUnavailable$219.38

63621 rates by state

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

MEWIVTNHMTNDMNMINYMARIWAIDWYSDIAILINOHPANJCTORNVUTCONEMOKYWVVAMDDECAAZNMKSOKARTNNCSCDCTXLAMSALGAFLAKHI

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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
63621 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 63621 rate is calculated

Each of 63621’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 · 63621

RVUs × geographic indexes × conversion factor

Swap in your local Medicare rate.

Work 3.90Practice expense 1.37Malpractice 1.64

6.9100 adjusted RVUs×$33.4009 conversion factor=$230.80

All indexes start at 1.000 (the national rate). Enter a ZIP or drag a slider.

Payment rules and modifiers for 63621

The CMS indicators that decide how 63621 is paid alongside other services.

CMS payment indicators · 63621

Spinal radiosurgery

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

63621 without 80 · national facility

$230.80

Spinal radiosurgery

63621-80 · Assistant: 16%

$36.93

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

When to use modifier 80

63621 compared with similar codes

Compare codes

63621 vs 63620 vs 63600 vs 77372: national Medicare rates

Swap in your local Medicare rate.

  • 63621
    Spinal radiosurgery · 3.9 wRVU
    —
  • 63620
    Spinal radiosurgery · 15.21 wRVU
    —
  • 63600
    Spinal lesion removal · 14.74 wRVU
    —
  • 77372
    Stereotactic radiosurgery · 0 wRVU
    $933.89

How to choose

63620Spinal radiosurgery
63620 represents spinal SRS for the first lesion and is the required primary procedure. Use 63621 only for additional lesions treated in that SRS service.
63600Spinal lesion removal
63600 is for surgical removal of a spinal cord lesion. Code 63621 is for an additional lesion treated with focused radiation, not excision.
77372Stereotactic radiosurgery
77372 identifies SRS treatment delivery, while 63621 identifies the physician service for each additional spinal lesion. They describe distinct services and may be reported together.

Codes related to 63621

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

Codes related to 63621
CodeHow it relatesNational office range
Add-on codes
63620Spinal radiosurgeryPrimary spinal SRS code reported for the first lesion; 63621 is the add-on for additional lesions.No office rate
Used instead
63600Spinal lesion removalDescribes surgical removal of a spinal cord lesion rather than SRS treatment of an additional lesion.No office rate
Often billed with
77371Srs multisourceSRS treatment delivery code that may be reported with the spinal SRS physician service.No office rate
77372Stereotactic radiosurgeryAnother SRS treatment delivery code that may accompany the spinal SRS physician service.$799.80–$1,340.31

63621 billing questions

What primary code must accompany 63621?

Report 63621 with 63620, the primary code for spinal SRS of the first lesion. This add-on code is not reported by itself.

How many units of 63621 should be reported?

Report one unit for each additional spinal lesion treated after the first. The record should support the distinct lesions included in the SRS treatment.

Is 63621 used for surgical removal of a spinal lesion?

No. It represents an additional lesion treated with SRS. Code 63600 describes removal of a spinal cord lesion, a different surgical service.

How does the global-period rule affect payment?

CMS treats 63621 as an add-on paid within the primary procedure’s global period. It must be billed with the primary procedure rather than as a separate standalone service.

What documentation supports reporting an additional lesion?

Document the spinal lesions treated and the SRS treatment that includes them, so the record supports reporting an additional lesion beyond the one represented by 63620.

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 63621PPRRVU2026_Oct_nonQPP.csv, line 7,076 (RVU26D)

Open CMS sourceHow we calculate rates

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